On 1/30/2019 10:24 AM, dpr wrote:
Hi Leslie- Great use of overlays.
Thanks.
I think this should work; I’ve “ported” degraded RAID6 arrays from LSI 92xx to MD a couple of
Yeah, I have high hopes.
times. I ended up having to use “—create —assume-clean”
I figured as much.
and guess at the DDF layout (I’ve seen both ddf-N-continue and ddf-N-restart, perhaps arrays created with different generations of LSI firmware?).
Could you elaborate just a bit, please?
It may be worth scanning the archives for “DDF”: https://marc.info/?l=linux-raid&w=2&r=1&s=ddf&q=b
I will certainly give it a shot.
The one time I ran an LSI-created array under MD for a long time, I lost a drive and couldn’t figure out how to make MD find a spare and start the rebuild. The array was on its way out the door anyway, so I didn’t research or file a report; I imagine it was human error, but my understanding is MD DDF is not heavily used. If the array will be around a while, it’s probably best to get the data off the array and rebuild it as an MD native.
No, it's not. I want to scrape the important data and build a new RAID6 array with larger drives and two hot spares. I will be replacing the 4 port controller with an 8 port. You mention employing an MD native array. Is MD supported under Windows 7? If so, I wasn't aware, and I would definitely prefer a native MD solution. I would not be in this mess if the array had been MD. Of course, I also would not be in this mess if I had been doing proper backups like I should. I will be booting from GRUB with both a Win 7 and a Debian target, so managing the system would be easy.
On Jan 30, 2019, at 8:18 AM, Leslie Rhorer <lrhorer@xxxxxxxxxxxx> wrote: Hello All, In the past, I was an active member of this forum, but I dropped off for a few years. I am back now because I have an issue with which I hope someone here can help me. I have a PC which has an LSI MegaRAID 9266-4i controller running RAID-5 on four drives, and unfortunately two of the four drives failed more or less simultaneously. One of the drives, however, was not completely dead, and with some time and a little babying, I was able to recover most of the important sections of one of the drives to a file using ddrescue. Unfortunately, I am having trouble getting the array to assemble properly after copying the file back to a drive using dd. I am hoping to be able to assemble the drive images under mdadm, but so far I am not getting the assembly to work, I think perhaps because not all the necessary information is available to mdadm during assembly. I created file images of both good drives and then I created loop devices from all three images and assembled using mdadm -A --force /dev/md7 /dev/loop0 /dev/loop1 /dev/loop2 When I examine the array, I get: RAID-Server:/RAID/Server-Main/Temp# mdadm -D /dev/md7 /dev/md7: Version : ddf Raid Level : container Total Devices : 3 Working Devices : 3 Container GUID : 4C534920:20202020:1000005B:10009269:4974DEC4:0689B9A9 (LSI 01/19/19 14:12:52) Seq : 0000000b Virtual Disks : 1 Member Arrays : Number Major Minor RaidDevice 0 7 1 - /dev/loop1 1 7 2 - /dev/loop2 2 7 0 - /dev/loop0 Looking at the loop devices themselves I get: RAID-Server:/RAID/Server-Main/Temp# mdadm -E /dev/loop0 /dev/loop1 /dev/loop2 /dev/loop0: Magic : de11de11 Version : 01.00.00 Controller GUID : 4C534920:20202020:53563632:38343632:35370000:20300000 (LSI SV62846257) Container GUID : 4C534920:20202020:1000005B:10009269:4974DEC4:0689B9A9 (LSI 01/19/19 14:12:52) Seq : 0000000b Redundant hdr : yes Virtual Disks : 1 VD GUID[0] : 4C534920:20202020:1000005B:10009269:48421933:6EAADB6C (LSI 05/31/18 22:36:19) unit[0] : 0 state[0] : Degraded, Consistent init state[0] : Not Initialised access[0] : Read/Write Name[0] : Raid Devices[0] : 4 (0@0K 1@0K 2@0K --@0K) Chunk Size[0] : 1024 sectors Raid Level[0] : RAID5 Device Size[0] : 116686848 Array Size[0] : 350060544 Physical Disks : 255 Number RefNo Size Device Type/State 0 b99f8876 116686848K /dev/loop0 active/Online 1 b99f8877 116686848K active/Online 2 b99f8878 116686848K active/Online 3 b99f8879 116686848K active/Offline, Failed /dev/loop1: Magic : de11de11 Version : 01.00.00 Controller GUID : 4C534920:20202020:53563632:38343632:35370000:20300000 (LSI SV62846257) Container GUID : 4C534920:20202020:1000005B:10009269:4974DEC4:0689B9A9 (LSI 01/19/19 14:12:52) Seq : 0000000b Redundant hdr : yes Virtual Disks : 1 VD GUID[0] : 4C534920:20202020:1000005B:10009269:48421933:6EAADB6C (LSI 05/31/18 22:36:19) unit[0] : 0 state[0] : Degraded, Consistent init state[0] : Not Initialised access[0] : Read/Write Name[0] : Raid Devices[0] : 4 (0@0K 1@0K 2@0K --@0K) Chunk Size[0] : 1024 sectors Raid Level[0] : RAID5 Device Size[0] : 116686848 Array Size[0] : 350060544 Physical Disks : 255 Number RefNo Size Device Type/State 0 b99f8876 116686848K active/Online 1 b99f8877 116686848K /dev/loop1 active/Online 2 b99f8878 116686848K active/Online 3 b99f8879 116686848K active/Offline, Failed /dev/loop2: Magic : de11de11 Version : 01.00.00 Controller GUID : 4C534920:20202020:53563632:38343632:35370000:20300000 (LSI SV62846257) Container GUID : 4C534920:20202020:1000005B:10009269:4974DEC4:0689B9A9 (LSI 01/19/19 14:12:52) Seq : 0000000b Redundant hdr : yes Virtual Disks : 1 VD GUID[0] : 4C534920:20202020:1000005B:10009269:48421933:6EAADB6C (LSI 05/31/18 22:36:19) unit[0] : 0 state[0] : Degraded, Consistent init state[0] : Not Initialised access[0] : Read/Write Name[0] : Raid Devices[0] : 4 (0@0K 1@0K 2@0K --@0K) Chunk Size[0] : 1024 sectors Raid Level[0] : RAID5 Device Size[0] : 116686848 Array Size[0] : 350060544 Physical Disks : 255 Number RefNo Size Device Type/State 0 b99f8876 116686848K active/Online 1 b99f8877 116686848K active/Online 2 b99f8878 116686848K /dev/loop2 active/Online 3 b99f8879 116686848K active/Offline, Failed The regular files look much the same: RAID-Server:/RAID/Server-Main/Temp# mdadm -E /RAID/Server-Main/Temp/LSI-RAID1 /RAID/Server-Main/Temp/LSI-RAID1: Magic : de11de11 Version : 01.00.00 Controller GUID : 4C534920:20202020:53563632:38343632:35370000:20300000 (LSI SV62846257) Container GUID : 4C534920:20202020:1000005B:10009269:4974DEC4:0689B9A9 (LSI 01/19/19 14:12:52) Seq : 0000000b Redundant hdr : yes Virtual Disks : 1 VD GUID[0] : 4C534920:20202020:1000005B:10009269:48421933:6EAADB6C (LSI 05/31/18 22:36:19) unit[0] : 0 state[0] : Degraded, Consistent init state[0] : Not Initialised access[0] : Read/Write Name[0] : Raid Devices[0] : 4 (0@0K 1@0K 2@0K --@0K) Chunk Size[0] : 1024 sectors Raid Level[0] : RAID5 Device Size[0] : 116686848 Array Size[0] : 350060544 Physical Disks : 255 Number RefNo Size Device Type/State 0 b99f8876 116686848K active/Online 1 b99f8877 116686848K active/Online 2 b99f8878 116686848K active/Online 3 b99f8879 116686848K active/Offline, Failed Physical disks not in metadata!: b99f8876 -unknown- Does anyone have any advice? I suspect I will have to force the creation of an array, manually inputting the array parameters - assuming it can be made to work at all. I have multiple backups of the drive images, so I can fiddle all I want.
