Perhaps also worth noting -- "mdadm -D /dev/md0" does not output the
stanza with Name, UUID and Events. Expected?
On Sun, Jan 12, 2014 at 11:42 PM, Richard Michael
<rmichael@xxxxxxxxxxxxxxxx> wrote:
> Following up my own message, I forgot to include mdadm and kernel versions:
>
> $ mdadm --version
> mdadm - v3.3 - 3rd September 2013
>
> $ uname -a
> Linux anvil.localdomain 3.12.6-300.fc20.x86_64 #1 SMP Mon Dec 23
> 16:44:31 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
>
>
>
> On Sun, Jan 12, 2014 at 11:37 PM, Richard Michael
> <rmichael@xxxxxxxxxxxxxxxx> wrote:
>> Hello list,
>>
>> I grew a RAID0 by one-disk, and it re-shaped via RAID4 as expected.
>>
>> However, the component superblocks still RAID4, while /proc/mdstat,
>> /sys/block/md0/md/level and "mdadm -D" all indicate RAID0.
>>
>> I am reluctant to stop the array, in case auto-assemble can't put it
>> back together. (I suppose I could create a new array, but I'd want to
>> be quite confident about the layout of the disks.)
>>
>>
>> Is this a bug? Should/can I re-write the superblock(s)?
>>
>>
>> # cat /proc/mdstat
>> Personalities : [raid0] [raid1] [raid6] [raid5] [raid4]
>> md0 : active raid0 sdc1[2] sdd1[0]
>> 5860268032 blocks super 1.2 512k chunks
>>
>> # cat /sys/block/md0/md/level
>> raid0
>>
>> # mdadm -D /dev/md0
>> /dev/md0:
>> Version : 1.2
>> Creation Time : Fri Jan 10 13:02:25 2014
>> Raid Level : raid0
>> Array Size : 5860268032 (5588.79 GiB 6000.91 GB)
>> Raid Devices : 2
>> Total Devices : 2
>> Persistence : Superblock is persistent
>>
>> Update Time : Sun Jan 12 20:08:53 2014
>> State : clean
>> Active Devices : 2
>> Working Devices : 2
>> Failed Devices : 0
>> Spare Devices : 0
>>
>> Chunk Size : 512K
>>
>> Number Major Minor RaidDevice State
>> 0 8 49 0 active sync /dev/sdd1
>> 2 8 33 1 active sync /dev/sdc1
>>
>>
>>
>> But,
>>
>>
>> # mdadm -E /dev/sd[cd]1
>> /dev/sdc1:
>> Magic : a92b4efc
>> Version : 1.2
>> Feature Map : 0x0
>> Array UUID : 8f51352a:610d0ecd:a1e28ddd:86c8586c
>> Name : anvil.localdomain:0 (local to host anvil.localdomain)
>> Creation Time : Fri Jan 10 13:02:25 2014
>> Raid Level : raid4
>> Raid Devices : 3
>>
>> Avail Dev Size : 5860268943 (2794.39 GiB 3000.46 GB)
>> Array Size : 5860268032 (5588.79 GiB 6000.91 GB)
>> Used Dev Size : 5860268032 (2794.39 GiB 3000.46 GB)
>> Data Offset : 260096 sectors
>> Super Offset : 8 sectors
>> Unused Space : before=260008 sectors, after=2959 sectors
>> State : clean
>> Device UUID : ad6e6c88:0f897bc1:1f6ec909:f599bc01
>>
>> Update Time : Sun Jan 12 20:08:53 2014
>> Bad Block Log : 512 entries available at offset 72 sectors
>> Checksum : 1388a7b - correct
>> Events : 9451
>>
>> Chunk Size : 512K
>>
>> Device Role : Active device 1
>> Array State : AA. ('A' == active, '.' == missing, 'R' == replacing)
>> /dev/sdd1:
>> Magic : a92b4efc
>> Version : 1.2
>> Feature Map : 0x0
>> Array UUID : 8f51352a:610d0ecd:a1e28ddd:86c8586c
>> Name : anvil.localdomain:0 (local to host anvil.localdomain)
>> Creation Time : Fri Jan 10 13:02:25 2014
>> Raid Level : raid4
>> Raid Devices : 3
>>
>> Avail Dev Size : 5860268032 (2794.39 GiB 3000.46 GB)
>> Array Size : 5860268032 (5588.79 GiB 6000.91 GB)
>> Data Offset : 260096 sectors
>> Super Offset : 8 sectors
>> Unused Space : before=260008 sectors, after=2959 sectors
>> State : clean
>> Device UUID : b3cda274:547919b1:4e026228:0a4981e7
>>
>> Update Time : Sun Jan 12 20:08:53 2014
>> Bad Block Log : 512 entries available at offset 72 sectors
>> Checksum : e16a1979 - correct
>> Events : 9451
>>
>> Chunk Size : 512K
>>
>> Device Role : Active device 0
>> Array State : AA. ('A' == active, '.' == missing, 'R' == replacing)
>>
>>
>>
>> Somewhat aside, I grew the array with:
>>
>> "mdadm --grow /dev/md0 --raid-devices=2 --add /dev/sdc1"
>>
>> I suspect I should not have used "--add". Looking at the superblock,
>> there is a 3rd unknown device, which I did not intend to add.
>>
>> Did I convince mdadm to add two devices at the same time, sdc1 *and* a
>> missing device? (This surprises me a bit, in the sense that
>> --raid-devices=2 would pertain to the added devices, rather than the
>> total devices in the array.)
>>
>> Or, perhaps mdadm add a "dummy" device as part of the temporary RAID4
>> conversion?
>>
>>
>> Thanks for any comments.
>>
>> Regards,
>> Richard
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