Hi Kuai,
I ended up using gdb rather than addr2line, as that output didn't give
me the global offset. Maybe there's a better way, but this seems to be
similar to what I expected.
(gdb) list *(reshape_request+0x416)
0x11566 is in reshape_request (drivers/md/raid5.c:6396).
6391 if ((mddev->reshape_backwards
6392 ? (safepos > writepos && readpos < writepos)
6393 : (safepos < writepos && readpos > writepos)) ||
6394 time_after(jiffies, conf->reshape_checkpoint + 10*HZ)) {
6395 /* Cannot proceed until we've updated the
superblock... */
6396 wait_event(conf->wait_for_overlap,
6397 atomic_read(&conf->reshape_stripes)==0
6398 || test_bit(MD_RECOVERY_INTR,
&mddev->recovery));
6399 if (atomic_read(&conf->reshape_stripes) != 0)
6400 return 0;
Thanks
On Mon, Sep 4, 2023 at 6:08 PM Yu Kuai <yukuai1@xxxxxxxxxxxxxxx> wrote:
>
> Hi,
>
> 在 2023/09/05 0:38, Jason Moss 写道:
> > Hi Kuai,
> >
> > Thank you for the suggestion, I was previously on 5.15.0. I've built
> > an environment with 6.5.0.1 now and assembled the array there, but the
> > same problem happens. It reshaped for 20-30 seconds, then completely
> > stopped.
> >
> > Processes and /proc/<PID>/stack output:
> > root 24593 0.0 0.0 0 0 ? I< 09:22 0:00 [raid5wq]
> > root 24594 96.5 0.0 0 0 ? R 09:22 2:29 [md0_raid6]
> > root 24595 0.3 0.0 0 0 ? D 09:22 0:00 [md0_reshape]
> >
> > [root@arch ~]# cat /proc/24593/stack
> > [<0>] rescuer_thread+0x2b0/0x3b0
> > [<0>] kthread+0xe8/0x120
> > [<0>] ret_from_fork+0x34/0x50
> > [<0>] ret_from_fork_asm+0x1b/0x30
> >
> > [root@arch ~]# cat /proc/24594/stack
> >
> > [root@arch ~]# cat /proc/24595/stack
> > [<0>] reshape_request+0x416/0x9f0 [raid456]
> Can you provide the addr2line result? Let's see where reshape_request()
> is stuck first.
>
> Thanks,
> Kuai
>
> > [<0>] raid5_sync_request+0x2fc/0x3d0 [raid456]
> > [<0>] md_do_sync+0x7d6/0x11d0 [md_mod]
> > [<0>] md_thread+0xae/0x190 [md_mod]
> > [<0>] kthread+0xe8/0x120
> > [<0>] ret_from_fork+0x34/0x50
> > [<0>] ret_from_fork_asm+0x1b/0x30
> >
> > Please let me know if there's a better way to provide the stack info.
> >
> > Thank you
> >
> > On Sun, Sep 3, 2023 at 6:41 PM Yu Kuai <yukuai1@xxxxxxxxxxxxxxx> wrote:
> >>
> >> Hi,
> >>
> >> 在 2023/09/04 5:39, Jason Moss 写道:
> >>> Hello,
> >>>
> >>> I recently attempted to add a new drive to my 8-drive RAID 6 array,
> >>> growing it to 9 drives. I've done similar before with the same array,
> >>> having previously grown it from 6 drives to 7 and then from 7 to 8
> >>> with no issues. Drives are WD Reds, most older than 2019, some
> >>> (including the newest) newer, but all confirmed CMR and not SMR.
> >>>
> >>> Process used to expand the array:
> >>> mdadm --add /dev/md0 /dev/sdb1
> >>> mdadm --grow --raid-devices=9 --backup-file=/root/grow_md0.bak /dev/md0
> >>>
> >>> The reshape started off fine, the process was underway, and the volume
> >>> was still usable as expected. However, 15-30 minutes into the reshape,
> >>> I lost access to the contents of the drive. Checking /proc/mdstat, the
> >>> reshape was stopped at 0.6% with the counter not incrementing at all.
> >>> Any process accessing the array would just hang until killed. I waited
> >>
> >> What kernel version are you using? And it'll be very helpful if you can
> >> collect the stack of all stuck thread. There is a known deadlock for
> >> raid5 related to reshape, and it's fixed in v6.5:
> >>
> >> https://lore.kernel.org/r/20230512015610.821290-6-yukuai1@xxxxxxxxxxxxxxx
> >>
> >>> a half hour and there was still no further change to the counter. At
> >>> this point, I restarted the server and found that when it came back up
> >>> it would begin reshaping again, but only very briefly, under 30
> >>> seconds, but the counter would be increasing during that time.
> >>>
> >>> I searched furiously for ideas and tried stopping and reassembling the
> >>> array, assembling with an invalid-backup flag, echoing "frozen" then
> >>> "reshape" to the sync_action file, and echoing "max" to the sync_max
> >>> file. Nothing ever seemed to make a difference.
> >>>
> >>
> >> Don't do this before v6.5, echo "reshape" while reshape is still in
> >> progress will corrupt your data:
> >>
> >> https://lore.kernel.org/r/20230512015610.821290-3-yukuai1@xxxxxxxxxxxxxxx
> >>
> >> Thanks,
> >> Kuai
> >>
> >>> Here is where I slightly panicked, worried that I'd borked my array,
> >>> and powered off the server again and disconnected the new drive that
> >>> was just added, assuming that since it was the change, it may be the
> >>> problem despite having burn-in tested it, and figuring that I'll rush
> >>> order a new drive, so long as the reshape continues and I can just
> >>> rebuild onto a new drive once the reshape finishes. However, this made
> >>> no difference and the array continued to not rebuild.
> >>>
> >>> Much searching later, I'd found nothing substantially different then
> >>> I'd already tried and one of the common threads in other people's
> >>> issues was bad drives, so I ran a self-test against each of the
> >>> existing drives and found one drive that failed the read test.
> >>> Thinking I had the culprit now, I dropped that drive out of the array
> >>> and assembled the array again, but the same behavior persists. The
> >>> array reshapes very briefly, then completely stops.
> >>>
> >>> Down to 0 drives of redundancy (in the reshaped section at least), not
> >>> finding any new ideas on any of the forums, mailing list, wiki, etc,
> >>> and very frustrated, I took a break, bought all new drives to build a
> >>> new array in another server and restored from a backup. However, there
> >>> is still some data not captured by the most recent backup that I would
> >>> like to recover, and I'd also like to solve the problem purely to
> >>> understand what happened and how to recover in the future.
> >>>
> >>> Is there anything else I should try to recover this array, or is this
> >>> a lost cause?
> >>>
> >>> Details requested by the wiki to follow and I'm happy to collect any
> >>> further data that would assist. /dev/sdb is the new drive that was
> >>> added, then disconnected. /dev/sdh is the drive that failed a
> >>> self-test and was removed from the array.
> >>>
> >>> Thank you in advance for any help provided!
> >>>
> >>>
> >>> $ uname -a
> >>> Linux Blyth 5.15.0-76-generic #83-Ubuntu SMP Thu Jun 15 19:16:32 UTC
> >>> 2023 x86_64 x86_64 x86_64 GNU/Linux
> >>>
> >>> $ mdadm --version
> >>> mdadm - v4.2 - 2021-12-30
> >>>
> >>>
> >>> $ sudo smartctl -H -i -l scterc /dev/sda
> >>> smartctl 7.2 2020-12-30 r5155 [x86_64-linux-5.15.0-76-generic] (local build)
> >>> Copyright (C) 2002-20, Bruce Allen, Christian Franke, www.smartmontools.org
> >>>
> >>> === START OF INFORMATION SECTION ===
> >>> Model Family: Western Digital Red
> >>> Device Model: WDC WD30EFRX-68EUZN0
> >>> Serial Number: WD-WCC4N7AT7R7X
> >>> LU WWN Device Id: 5 0014ee 268545f93
> >>> Firmware Version: 82.00A82
> >>> User Capacity: 3,000,592,982,016 bytes [3.00 TB]
> >>> Sector Sizes: 512 bytes logical, 4096 bytes physical
> >>> Rotation Rate: 5400 rpm
> >>> Device is: In smartctl database [for details use: -P show]
> >>> ATA Version is: ACS-2 (minor revision not indicated)
> >>> SATA Version is: SATA 3.0, 6.0 Gb/s (current: 6.0 Gb/s)
> >>> Local Time is: Sun Sep 3 13:27:55 2023 PDT
> >>> SMART support is: Available - device has SMART capability.
> >>> SMART support is: Enabled
> >>>
> >>> === START OF READ SMART DATA SECTION ===
> >>> SMART overall-health self-assessment test result: PASSED
> >>>
> >>> SCT Error Recovery Control:
> >>> Read: 70 (7.0 seconds)
> >>> Write: 70 (7.0 seconds)
> >>>
> >>> $ sudo smartctl -H -i -l scterc /dev/sda
> >>> smartctl 7.2 2020-12-30 r5155 [x86_64-linux-5.15.0-76-generic] (local build)
> >>> Copyright (C) 2002-20, Bruce Allen, Christian Franke, www.smartmontools.org
> >>>
> >>> === START OF INFORMATION SECTION ===
> >>> Model Family: Western Digital Red
> >>> Device Model: WDC WD30EFRX-68EUZN0
> >>> Serial Number: WD-WCC4N7AT7R7X
> >>> LU WWN Device Id: 5 0014ee 268545f93
> >>> Firmware Version: 82.00A82
> >>> User Capacity: 3,000,592,982,016 bytes [3.00 TB]
> >>> Sector Sizes: 512 bytes logical, 4096 bytes physical
> >>> Rotation Rate: 5400 rpm
> >>> Device is: In smartctl database [for details use: -P show]
> >>> ATA Version is: ACS-2 (minor revision not indicated)
> >>> SATA Version is: SATA 3.0, 6.0 Gb/s (current: 6.0 Gb/s)
> >>> Local Time is: Sun Sep 3 13:28:16 2023 PDT
> >>> SMART support is: Available - device has SMART capability.
> >>> SMART support is: Enabled
> >>>
> >>> === START OF READ SMART DATA SECTION ===
> >>> SMART overall-health self-assessment test result: PASSED
> >>>
> >>> SCT Error Recovery Control:
> >>> Read: 70 (7.0 seconds)
> >>> Write: 70 (7.0 seconds)
> >>>
> >>> $ sudo smartctl -H -i -l scterc /dev/sdb
> >>> smartctl 7.2 2020-12-30 r5155 [x86_64-linux-5.15.0-76-generic] (local build)
> >>> Copyright (C) 2002-20, Bruce Allen, Christian Franke, www.smartmontools.org
> >>>
> >>> === START OF INFORMATION SECTION ===
> >>> Model Family: Western Digital Red
> >>> Device Model: WDC WD30EFRX-68EUZN0
> >>> Serial Number: WD-WXG1A8UGLS42
> >>> LU WWN Device Id: 5 0014ee 2b75ef53b
> >>> Firmware Version: 80.00A80
> >>> User Capacity: 3,000,592,982,016 bytes [3.00 TB]
> >>> Sector Sizes: 512 bytes logical, 4096 bytes physical
> >>> Rotation Rate: 5400 rpm
> >>> Device is: In smartctl database [for details use: -P show]
> >>> ATA Version is: ACS-2 (minor revision not indicated)
> >>> SATA Version is: SATA 3.0, 6.0 Gb/s (current: 6.0 Gb/s)
> >>> Local Time is: Sun Sep 3 13:28:19 2023 PDT
> >>> SMART support is: Available - device has SMART capability.
> >>> SMART support is: Enabled
> >>>
> >>> === START OF READ SMART DATA SECTION ===
> >>> SMART overall-health self-assessment test result: PASSED
> >>>
> >>> SCT Error Recovery Control:
> >>> Read: 70 (7.0 seconds)
> >>> Write: 70 (7.0 seconds)
> >>>
> >>> $ sudo smartctl -H -i -l scterc /dev/sdc
> >>> smartctl 7.2 2020-12-30 r5155 [x86_64-linux-5.15.0-76-generic] (local build)
> >>> Copyright (C) 2002-20, Bruce Allen, Christian Franke, www.smartmontools.org
> >>>
> >>> === START OF INFORMATION SECTION ===
> >>> Model Family: Western Digital Red
> >>> Device Model: WDC WD30EFRX-68EUZN0
> >>> Serial Number: WD-WCC4N4HYL32Y
> >>> LU WWN Device Id: 5 0014ee 2630752f8
> >>> Firmware Version: 82.00A82
> >>> User Capacity: 3,000,592,982,016 bytes [3.00 TB]
> >>> Sector Sizes: 512 bytes logical, 4096 bytes physical
> >>> Rotation Rate: 5400 rpm
> >>> Device is: In smartctl database [for details use: -P show]
> >>> ATA Version is: ACS-2 (minor revision not indicated)
> >>> SATA Version is: SATA 3.0, 6.0 Gb/s (current: 6.0 Gb/s)
> >>> Local Time is: Sun Sep 3 13:28:20 2023 PDT
> >>> SMART support is: Available - device has SMART capability.
> >>> SMART support is: Enabled
> >>>
> >>> === START OF READ SMART DATA SECTION ===
> >>> SMART overall-health self-assessment test result: PASSED
> >>>
> >>> SCT Error Recovery Control:
> >>> Read: 70 (7.0 seconds)
> >>> Write: 70 (7.0 seconds)
> >>>
> >>> $ sudo smartctl -H -i -l scterc /dev/sdd
> >>> smartctl 7.2 2020-12-30 r5155 [x86_64-linux-5.15.0-76-generic] (local build)
> >>> Copyright (C) 2002-20, Bruce Allen, Christian Franke, www.smartmontools.org
> >>>
> >>> === START OF INFORMATION SECTION ===
> >>> Model Family: Western Digital Red
> >>> Device Model: WDC WD30EFRX-68N32N0
> >>> Serial Number: WD-WCC7K1FF6DYK
> >>> LU WWN Device Id: 5 0014ee 2ba952a30
> >>> Firmware Version: 82.00A82
> >>> User Capacity: 3,000,592,982,016 bytes [3.00 TB]
> >>> Sector Sizes: 512 bytes logical, 4096 bytes physical
> >>> Rotation Rate: 5400 rpm
> >>> Form Factor: 3.5 inches
> >>> Device is: In smartctl database [for details use: -P show]
> >>> ATA Version is: ACS-3 T13/2161-D revision 5
> >>> SATA Version is: SATA 3.1, 6.0 Gb/s (current: 6.0 Gb/s)
> >>> Local Time is: Sun Sep 3 13:28:21 2023 PDT
> >>> SMART support is: Available - device has SMART capability.
> >>> SMART support is: Enabled
> >>>
> >>> === START OF READ SMART DATA SECTION ===
> >>> SMART overall-health self-assessment test result: PASSED
> >>>
> >>> SCT Error Recovery Control:
> >>> Read: 70 (7.0 seconds)
> >>> Write: 70 (7.0 seconds)
> >>>
> >>> $ sudo smartctl -H -i -l scterc /dev/sde
> >>> smartctl 7.2 2020-12-30 r5155 [x86_64-linux-5.15.0-76-generic] (local build)
> >>> Copyright (C) 2002-20, Bruce Allen, Christian Franke, www.smartmontools.org
> >>>
> >>> === START OF INFORMATION SECTION ===
> >>> Model Family: Western Digital Red
> >>> Device Model: WDC WD30EFRX-68EUZN0
> >>> Serial Number: WD-WCC4N5ZHTRJF
> >>> LU WWN Device Id: 5 0014ee 2b88b83bb
> >>> Firmware Version: 82.00A82
> >>> User Capacity: 3,000,592,982,016 bytes [3.00 TB]
> >>> Sector Sizes: 512 bytes logical, 4096 bytes physical
> >>> Rotation Rate: 5400 rpm
> >>> Device is: In smartctl database [for details use: -P show]
> >>> ATA Version is: ACS-2 (minor revision not indicated)
> >>> SATA Version is: SATA 3.0, 6.0 Gb/s (current: 6.0 Gb/s)
> >>> Local Time is: Sun Sep 3 13:28:22 2023 PDT
> >>> SMART support is: Available - device has SMART capability.
> >>> SMART support is: Enabled
> >>>
> >>> === START OF READ SMART DATA SECTION ===
> >>> SMART overall-health self-assessment test result: PASSED
> >>>
> >>> SCT Error Recovery Control:
> >>> Read: 70 (7.0 seconds)
> >>> Write: 70 (7.0 seconds)
> >>>
> >>> $ sudo smartctl -H -i -l scterc /dev/sdf
> >>> smartctl 7.2 2020-12-30 r5155 [x86_64-linux-5.15.0-76-generic] (local build)
> >>> Copyright (C) 2002-20, Bruce Allen, Christian Franke, www.smartmontools.org
> >>>
> >>> === START OF INFORMATION SECTION ===
> >>> Model Family: Western Digital Red
> >>> Device Model: WDC WD30EFRX-68AX9N0
> >>> Serial Number: WD-WMC1T3804790
> >>> LU WWN Device Id: 5 0014ee 6036b6826
> >>> Firmware Version: 80.00A80
> >>> User Capacity: 3,000,592,982,016 bytes [3.00 TB]
> >>> Sector Sizes: 512 bytes logical, 4096 bytes physical
> >>> Device is: In smartctl database [for details use: -P show]
> >>> ATA Version is: ACS-2 (minor revision not indicated)
> >>> SATA Version is: SATA 3.0, 6.0 Gb/s (current: 6.0 Gb/s)
> >>> Local Time is: Sun Sep 3 13:28:23 2023 PDT
> >>> SMART support is: Available - device has SMART capability.
> >>> SMART support is: Enabled
> >>>
> >>> === START OF READ SMART DATA SECTION ===
> >>> SMART overall-health self-assessment test result: PASSED
> >>>
> >>> SCT Error Recovery Control:
> >>> Read: 70 (7.0 seconds)
> >>> Write: 70 (7.0 seconds)
> >>>
> >>> $ sudo smartctl -H -i -l scterc /dev/sdg
> >>> smartctl 7.2 2020-12-30 r5155 [x86_64-linux-5.15.0-76-generic] (local build)
> >>> Copyright (C) 2002-20, Bruce Allen, Christian Franke, www.smartmontools.org
> >>>
> >>> === START OF INFORMATION SECTION ===
> >>> Model Family: Western Digital Red
> >>> Device Model: WDC WD30EFRX-68EUZN0
> >>> Serial Number: WD-WMC4N0H692Z9
> >>> LU WWN Device Id: 5 0014ee 65af39740
> >>> Firmware Version: 82.00A82
> >>> User Capacity: 3,000,592,982,016 bytes [3.00 TB]
> >>> Sector Sizes: 512 bytes logical, 4096 bytes physical
> >>> Rotation Rate: 5400 rpm
> >>> Device is: In smartctl database [for details use: -P show]
> >>> ATA Version is: ACS-2 (minor revision not indicated)
> >>> SATA Version is: SATA 3.0, 6.0 Gb/s (current: 6.0 Gb/s)
> >>> Local Time is: Sun Sep 3 13:28:24 2023 PDT
> >>> SMART support is: Available - device has SMART capability.
> >>> SMART support is: Enabled
> >>>
> >>> === START OF READ SMART DATA SECTION ===
> >>> SMART overall-health self-assessment test result: PASSED
> >>>
> >>> SCT Error Recovery Control:
> >>> Read: 70 (7.0 seconds)
> >>> Write: 70 (7.0 seconds)
> >>>
> >>> $ sudo smartctl -H -i -l scterc /dev/sdh
> >>> smartctl 7.2 2020-12-30 r5155 [x86_64-linux-5.15.0-76-generic] (local build)
> >>> Copyright (C) 2002-20, Bruce Allen, Christian Franke, www.smartmontools.org
> >>>
> >>> === START OF INFORMATION SECTION ===
> >>> Model Family: Western Digital Red
> >>> Device Model: WDC WD30EFRX-68EUZN0
> >>> Serial Number: WD-WMC4N0K5S750
> >>> LU WWN Device Id: 5 0014ee 6b048d9ca
> >>> Firmware Version: 82.00A82
> >>> User Capacity: 3,000,592,982,016 bytes [3.00 TB]
> >>> Sector Sizes: 512 bytes logical, 4096 bytes physical
> >>> Rotation Rate: 5400 rpm
> >>> Device is: In smartctl database [for details use: -P show]
> >>> ATA Version is: ACS-2 (minor revision not indicated)
> >>> SATA Version is: SATA 3.0, 6.0 Gb/s (current: 6.0 Gb/s)
> >>> Local Time is: Sun Sep 3 13:28:24 2023 PDT
> >>> SMART support is: Available - device has SMART capability.
> >>> SMART support is: Enabled
> >>>
> >>> === START OF READ SMART DATA SECTION ===
> >>> SMART overall-health self-assessment test result: PASSED
> >>>
> >>> SCT Error Recovery Control:
> >>> Read: 70 (7.0 seconds)
> >>> Write: 70 (7.0 seconds)
> >>>
> >>> $ sudo smartctl -H -i -l scterc /dev/sdi
> >>> smartctl 7.2 2020-12-30 r5155 [x86_64-linux-5.15.0-76-generic] (local build)
> >>> Copyright (C) 2002-20, Bruce Allen, Christian Franke, www.smartmontools.org
> >>>
> >>> === START OF INFORMATION SECTION ===
> >>> Model Family: Western Digital Red
> >>> Device Model: WDC WD30EFRX-68AX9N0
> >>> Serial Number: WD-WMC1T1502475
> >>> LU WWN Device Id: 5 0014ee 058d2e5cb
> >>> Firmware Version: 80.00A80
> >>> User Capacity: 3,000,592,982,016 bytes [3.00 TB]
> >>> Sector Sizes: 512 bytes logical, 4096 bytes physical
> >>> Device is: In smartctl database [for details use: -P show]
> >>> ATA Version is: ACS-2 (minor revision not indicated)
> >>> SATA Version is: SATA 3.0, 6.0 Gb/s (current: 6.0 Gb/s)
> >>> Local Time is: Sun Sep 3 13:28:27 2023 PDT
> >>> SMART support is: Available - device has SMART capability.
> >>> SMART support is: Enabled
> >>>
> >>> === START OF READ SMART DATA SECTION ===
> >>> SMART overall-health self-assessment test result: PASSED
> >>>
> >>> SCT Error Recovery Control:
> >>> Read: 70 (7.0 seconds)
> >>> Write: 70 (7.0 seconds)
> >>>
> >>>
> >>> $ sudo mdadm --examine /dev/sda
> >>> /dev/sda:
> >>> MBR Magic : aa55
> >>> Partition[0] : 4294967295 sectors at 1 (type ee)
> >>> $ sudo mdadm --examine /dev/sda1
> >>> /dev/sda1:
> >>> Magic : a92b4efc
> >>> Version : 1.2
> >>> Feature Map : 0xd
> >>> Array UUID : 440dc11e:079308b1:131eda79:9a74c670
> >>> Name : Blyth:0 (local to host Blyth)
> >>> Creation Time : Tue Aug 4 23:47:57 2015
> >>> Raid Level : raid6
> >>> Raid Devices : 9
> >>>
> >>> Avail Dev Size : 5856376832 sectors (2.73 TiB 3.00 TB)
> >>> Array Size : 20497268736 KiB (19.09 TiB 20.99 TB)
> >>> Used Dev Size : 5856362496 sectors (2.73 TiB 3.00 TB)
> >>> Data Offset : 247808 sectors
> >>> Super Offset : 8 sectors
> >>> Unused Space : before=247728 sectors, after=14336 sectors
> >>> State : clean
> >>> Device UUID : 8ca60ad5:60d19333:11b24820:91453532
> >>>
> >>> Internal Bitmap : 8 sectors from superblock
> >>> Reshape pos'n : 124311040 (118.55 GiB 127.29 GB)
> >>> Delta Devices : 1 (8->9)
> >>>
> >>> Update Time : Tue Jul 11 23:12:08 2023
> >>> Bad Block Log : 512 entries available at offset 24 sectors - bad
> >>> blocks present.
> >>> Checksum : b6d8f4d1 - correct
> >>> Events : 181105
> >>>
> >>> Layout : left-symmetric
> >>> Chunk Size : 512K
> >>>
> >>> Device Role : Active device 7
> >>> Array State : AA.AAAAA. ('A' == active, '.' == missing, 'R' == replacing)
> >>>
> >>> $ sudo mdadm --examine /dev/sdb
> >>> /dev/sdb:
> >>> MBR Magic : aa55
> >>> Partition[0] : 4294967295 sectors at 1 (type ee)
> >>> $ sudo mdadm --examine /dev/sdb1
> >>> /dev/sdb1:
> >>> Magic : a92b4efc
> >>> Version : 1.2
> >>> Feature Map : 0x5
> >>> Array UUID : 440dc11e:079308b1:131eda79:9a74c670
> >>> Name : Blyth:0 (local to host Blyth)
> >>> Creation Time : Tue Aug 4 23:47:57 2015
> >>> Raid Level : raid6
> >>> Raid Devices : 9
> >>>
> >>> Avail Dev Size : 5856376832 sectors (2.73 TiB 3.00 TB)
> >>> Array Size : 20497268736 KiB (19.09 TiB 20.99 TB)
> >>> Used Dev Size : 5856362496 sectors (2.73 TiB 3.00 TB)
> >>> Data Offset : 247808 sectors
> >>> Super Offset : 8 sectors
> >>> Unused Space : before=247728 sectors, after=14336 sectors
> >>> State : clean
> >>> Device UUID : 386d3001:16447e43:4d2a5459:85618d11
> >>>
> >>> Internal Bitmap : 8 sectors from superblock
> >>> Reshape pos'n : 124207104 (118.45 GiB 127.19 GB)
> >>> Delta Devices : 1 (8->9)
> >>>
> >>> Update Time : Tue Jul 11 00:02:59 2023
> >>> Bad Block Log : 512 entries available at offset 24 sectors
> >>> Checksum : b544a39 - correct
> >>> Events : 181077
> >>>
> >>> Layout : left-symmetric
> >>> Chunk Size : 512K
> >>>
> >>> Device Role : Active device 8
> >>> Array State : AAAAAAAAA ('A' == active, '.' == missing, 'R' == replacing)
> >>>
> >>> $ sudo mdadm --examine /dev/sdc
> >>> /dev/sdc:
> >>> MBR Magic : aa55
> >>> Partition[0] : 4294967295 sectors at 1 (type ee)
> >>> $ sudo mdadm --examine /dev/sdc1
> >>> /dev/sdc1:
> >>> Magic : a92b4efc
> >>> Version : 1.2
> >>> Feature Map : 0xd
> >>> Array UUID : 440dc11e:079308b1:131eda79:9a74c670
> >>> Name : Blyth:0 (local to host Blyth)
> >>> Creation Time : Tue Aug 4 23:47:57 2015
> >>> Raid Level : raid6
> >>> Raid Devices : 9
> >>>
> >>> Avail Dev Size : 5856376832 sectors (2.73 TiB 3.00 TB)
> >>> Array Size : 20497268736 KiB (19.09 TiB 20.99 TB)
> >>> Used Dev Size : 5856362496 sectors (2.73 TiB 3.00 TB)
> >>> Data Offset : 247808 sectors
> >>> Super Offset : 8 sectors
> >>> Unused Space : before=247720 sectors, after=14336 sectors
> >>> State : clean
> >>> Device UUID : 1798ec4f:72c56905:4e74ea61:2468db75
> >>>
> >>> Internal Bitmap : 8 sectors from superblock
> >>> Reshape pos'n : 124311040 (118.55 GiB 127.29 GB)
> >>> Delta Devices : 1 (8->9)
> >>>
> >>> Update Time : Tue Jul 11 23:12:08 2023
> >>> Bad Block Log : 512 entries available at offset 72 sectors - bad
> >>> blocks present.
> >>> Checksum : 88d8b8fc - correct
> >>> Events : 181105
> >>>
> >>> Layout : left-symmetric
> >>> Chunk Size : 512K
> >>>
> >>> Device Role : Active device 4
> >>> Array State : AA.AAAAA. ('A' == active, '.' == missing, 'R' == replacing)
> >>>
> >>> $ sudo mdadm --examine /dev/sdd
> >>> /dev/sdd:
> >>> MBR Magic : aa55
> >>> Partition[0] : 4294967295 sectors at 1 (type ee)
> >>> $ sudo mdadm --examine /dev/sdd1
> >>> /dev/sdd1:
> >>> Magic : a92b4efc
> >>> Version : 1.2
> >>> Feature Map : 0x5
> >>> Array UUID : 440dc11e:079308b1:131eda79:9a74c670
> >>> Name : Blyth:0 (local to host Blyth)
> >>> Creation Time : Tue Aug 4 23:47:57 2015
> >>> Raid Level : raid6
> >>> Raid Devices : 9
> >>>
> >>> Avail Dev Size : 5856376832 sectors (2.73 TiB 3.00 TB)
> >>> Array Size : 20497268736 KiB (19.09 TiB 20.99 TB)
> >>> Used Dev Size : 5856362496 sectors (2.73 TiB 3.00 TB)
> >>> Data Offset : 247808 sectors
> >>> Super Offset : 8 sectors
> >>> Unused Space : before=247728 sectors, after=14336 sectors
> >>> State : clean
> >>> Device UUID : a198095b:f54d26a9:deb3be8f:d6de9be1
> >>>
> >>> Internal Bitmap : 8 sectors from superblock
> >>> Reshape pos'n : 124311040 (118.55 GiB 127.29 GB)
> >>> Delta Devices : 1 (8->9)
> >>>
> >>> Update Time : Tue Jul 11 23:12:08 2023
> >>> Bad Block Log : 512 entries available at offset 24 sectors
> >>> Checksum : d1471d9d - correct
> >>> Events : 181105
> >>>
> >>> Layout : left-symmetric
> >>> Chunk Size : 512K
> >>>
> >>> Device Role : Active device 6
> >>> Array State : AA.AAAAA. ('A' == active, '.' == missing, 'R' == replacing)
> >>>
> >>> $ sudo mdadm --examine /dev/sde
> >>> /dev/sde:
> >>> MBR Magic : aa55
> >>> Partition[0] : 4294967295 sectors at 1 (type ee)
> >>> $ sudo mdadm --examine /dev/sde1
> >>> /dev/sde1:
> >>> Magic : a92b4efc
> >>> Version : 1.2
> >>> Feature Map : 0x5
> >>> Array UUID : 440dc11e:079308b1:131eda79:9a74c670
> >>> Name : Blyth:0 (local to host Blyth)
> >>> Creation Time : Tue Aug 4 23:47:57 2015
> >>> Raid Level : raid6
> >>> Raid Devices : 9
> >>>
> >>> Avail Dev Size : 5856376832 sectors (2.73 TiB 3.00 TB)
> >>> Array Size : 20497268736 KiB (19.09 TiB 20.99 TB)
> >>> Used Dev Size : 5856362496 sectors (2.73 TiB 3.00 TB)
> >>> Data Offset : 247808 sectors
> >>> Super Offset : 8 sectors
> >>> Unused Space : before=247720 sectors, after=14336 sectors
> >>> State : clean
> >>> Device UUID : acf7ba2e:35d2fa91:6b12b0ce:33a73af5
> >>>
> >>> Internal Bitmap : 8 sectors from superblock
> >>> Reshape pos'n : 124311040 (118.55 GiB 127.29 GB)
> >>> Delta Devices : 1 (8->9)
> >>>
> >>> Update Time : Tue Jul 11 23:12:08 2023
> >>> Bad Block Log : 512 entries available at offset 72 sectors
> >>> Checksum : e05d0278 - correct
> >>> Events : 181105
> >>>
> >>> Layout : left-symmetric
> >>> Chunk Size : 512K
> >>>
> >>> Device Role : Active device 5
> >>> Array State : AA.AAAAA. ('A' == active, '.' == missing, 'R' == replacing)
> >>>
> >>> $ sudo mdadm --examine /dev/sdf
> >>> /dev/sdf:
> >>> MBR Magic : aa55
> >>> Partition[0] : 4294967295 sectors at 1 (type ee)
> >>> $ sudo mdadm --examine /dev/sdf1
> >>> /dev/sdf1:
> >>> Magic : a92b4efc
> >>> Version : 1.2
> >>> Feature Map : 0x5
> >>> Array UUID : 440dc11e:079308b1:131eda79:9a74c670
> >>> Name : Blyth:0 (local to host Blyth)
> >>> Creation Time : Tue Aug 4 23:47:57 2015
> >>> Raid Level : raid6
> >>> Raid Devices : 9
> >>>
> >>> Avail Dev Size : 5856373760 sectors (2.73 TiB 3.00 TB)
> >>> Array Size : 20497268736 KiB (19.09 TiB 20.99 TB)
> >>> Used Dev Size : 5856362496 sectors (2.73 TiB 3.00 TB)
> >>> Data Offset : 247808 sectors
> >>> Super Offset : 8 sectors
> >>> Unused Space : before=247720 sectors, after=14336 sectors
> >>> State : clean
> >>> Device UUID : 31e7b86d:c274ff45:aa6dab50:2ff058c6
> >>>
> >>> Internal Bitmap : 8 sectors from superblock
> >>> Reshape pos'n : 124311040 (118.55 GiB 127.29 GB)
> >>> Delta Devices : 1 (8->9)
> >>>
> >>> Update Time : Tue Jul 11 23:12:08 2023
> >>> Bad Block Log : 512 entries available at offset 72 sectors
> >>> Checksum : 26792cc0 - correct
> >>> Events : 181105
> >>>
> >>> Layout : left-symmetric
> >>> Chunk Size : 512K
> >>>
> >>> Device Role : Active device 0
> >>> Array State : AA.AAAAA. ('A' == active, '.' == missing, 'R' == replacing)
> >>>
> >>> $ sudo mdadm --examine /dev/sdg
> >>> /dev/sdg:
> >>> MBR Magic : aa55
> >>> Partition[0] : 4294967295 sectors at 1 (type ee)
> >>> $ sudo mdadm --examine /dev/sdg1
> >>> /dev/sdg1:
> >>> Magic : a92b4efc
> >>> Version : 1.2
> >>> Feature Map : 0x5
> >>> Array UUID : 440dc11e:079308b1:131eda79:9a74c670
> >>> Name : Blyth:0 (local to host Blyth)
> >>> Creation Time : Tue Aug 4 23:47:57 2015
> >>> Raid Level : raid6
> >>> Raid Devices : 9
> >>>
> >>> Avail Dev Size : 5856373760 sectors (2.73 TiB 3.00 TB)
> >>> Array Size : 20497268736 KiB (19.09 TiB 20.99 TB)
> >>> Used Dev Size : 5856362496 sectors (2.73 TiB 3.00 TB)
> >>> Data Offset : 247808 sectors
> >>> Super Offset : 8 sectors
> >>> Unused Space : before=247720 sectors, after=14336 sectors
> >>> State : clean
> >>> Device UUID : 74476ce7:4edc23f6:08120711:ba281425
> >>>
> >>> Internal Bitmap : 8 sectors from superblock
> >>> Reshape pos'n : 124311040 (118.55 GiB 127.29 GB)
> >>> Delta Devices : 1 (8->9)
> >>>
> >>> Update Time : Tue Jul 11 23:12:08 2023
> >>> Bad Block Log : 512 entries available at offset 72 sectors
> >>> Checksum : 6f67d179 - correct
> >>> Events : 181105
> >>>
> >>> Layout : left-symmetric
> >>> Chunk Size : 512K
> >>>
> >>> Device Role : Active device 1
> >>> Array State : AA.AAAAA. ('A' == active, '.' == missing, 'R' == replacing)
> >>>
> >>> $ sudo mdadm --examine /dev/sdh
> >>> /dev/sdh:
> >>> MBR Magic : aa55
> >>> Partition[0] : 4294967295 sectors at 1 (type ee)
> >>> $ sudo mdadm --examine /dev/sdh1
> >>> /dev/sdh1:
> >>> Magic : a92b4efc
> >>> Version : 1.2
> >>> Feature Map : 0xd
> >>> Array UUID : 440dc11e:079308b1:131eda79:9a74c670
> >>> Name : Blyth:0 (local to host Blyth)
> >>> Creation Time : Tue Aug 4 23:47:57 2015
> >>> Raid Level : raid6
> >>> Raid Devices : 9
> >>>
> >>> Avail Dev Size : 5856373760 sectors (2.73 TiB 3.00 TB)
> >>> Array Size : 20497268736 KiB (19.09 TiB 20.99 TB)
> >>> Used Dev Size : 5856362496 sectors (2.73 TiB 3.00 TB)
> >>> Data Offset : 247808 sectors
> >>> Super Offset : 8 sectors
> >>> Unused Space : before=247720 sectors, after=14336 sectors
> >>> State : clean
> >>> Device UUID : 31c08263:b135f0f5:763bc86b:f81d7296
> >>>
> >>> Internal Bitmap : 8 sectors from superblock
> >>> Reshape pos'n : 124207104 (118.45 GiB 127.19 GB)
> >>> Delta Devices : 1 (8->9)
> >>>
> >>> Update Time : Tue Jul 11 20:09:14 2023
> >>> Bad Block Log : 512 entries available at offset 72 sectors - bad
> >>> blocks present.
> >>> Checksum : b7696b68 - correct
> >>> Events : 181089
> >>>
> >>> Layout : left-symmetric
> >>> Chunk Size : 512K
> >>>
> >>> Device Role : Active device 2
> >>> Array State : AAAAAAAA. ('A' == active, '.' == missing, 'R' == replacing)
> >>>
> >>> $ sudo mdadm --examine /dev/sdi
> >>> /dev/sdi:
> >>> MBR Magic : aa55
> >>> Partition[0] : 4294967295 sectors at 1 (type ee)
> >>> $ sudo mdadm --examine /dev/sdi1
> >>> /dev/sdi1:
> >>> Magic : a92b4efc
> >>> Version : 1.2
> >>> Feature Map : 0x5
> >>> Array UUID : 440dc11e:079308b1:131eda79:9a74c670
> >>> Name : Blyth:0 (local to host Blyth)
> >>> Creation Time : Tue Aug 4 23:47:57 2015
> >>> Raid Level : raid6
> >>> Raid Devices : 9
> >>>
> >>> Avail Dev Size : 5856373760 sectors (2.73 TiB 3.00 TB)
> >>> Array Size : 20497268736 KiB (19.09 TiB 20.99 TB)
> >>> Used Dev Size : 5856362496 sectors (2.73 TiB 3.00 TB)
> >>> Data Offset : 247808 sectors
> >>> Super Offset : 8 sectors
> >>> Unused Space : before=247720 sectors, after=14336 sectors
> >>> State : clean
> >>> Device UUID : ac1063fc:d9d66e6d:f3de33da:b396f483
> >>>
> >>> Internal Bitmap : 8 sectors from superblock
> >>> Reshape pos'n : 124311040 (118.55 GiB 127.29 GB)
> >>> Delta Devices : 1 (8->9)
> >>>
> >>> Update Time : Tue Jul 11 23:12:08 2023
> >>> Bad Block Log : 512 entries available at offset 72 sectors
> >>> Checksum : 23b6d024 - correct
> >>> Events : 181105
> >>>
> >>> Layout : left-symmetric
> >>> Chunk Size : 512K
> >>>
> >>> Device Role : Active device 3
> >>> Array State : AA.AAAAA. ('A' == active, '.' == missing, 'R' == replacing)
> >>>
> >>> $ sudo mdadm --detail /dev/md0
> >>> /dev/md0:
> >>> Version : 1.2
> >>> Raid Level : raid6
> >>> Total Devices : 9
> >>> Persistence : Superblock is persistent
> >>>
> >>> State : inactive
> >>> Working Devices : 9
> >>>
> >>> Delta Devices : 1, (-1->0)
> >>> New Level : raid6
> >>> New Layout : left-symmetric
> >>> New Chunksize : 512K
> >>>
> >>> Name : Blyth:0 (local to host Blyth)
> >>> UUID : 440dc11e:079308b1:131eda79:9a74c670
> >>> Events : 181105
> >>>
> >>> Number Major Minor RaidDevice
> >>>
> >>> - 8 1 - /dev/sda1
> >>> - 8 129 - /dev/sdi1
> >>> - 8 113 - /dev/sdh1
> >>> - 8 97 - /dev/sdg1
> >>> - 8 81 - /dev/sdf1
> >>> - 8 65 - /dev/sde1
> >>> - 8 49 - /dev/sdd1
> >>> - 8 33 - /dev/sdc1
> >>> - 8 17 - /dev/sdb1
> >>>
> >>> $ cat /proc/mdstat
> >>> Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5]
> >>> [raid4] [raid10]
> >>> md0 : inactive sdb1[9](S) sdi1[4](S) sdf1[0](S) sdg1[1](S) sdh1[3](S)
> >>> sda1[8](S) sdd1[7](S) sdc1[6](S) sde1[5](S)
> >>> 26353689600 blocks super 1.2
> >>>
> >>> unused devices: <none>
> >>>
> >>> .
> >>>
> >>
> >
> > .
> >
>
