Re: mdadm

Hi Neil, I apologize for bothering you with this but maybe it'll help others as well. I am using the latest mdadm (3.0) and when I did a grow on a 3 partition RAID5 to 4, the machine shutdown on the UPS signal gracefully during the critical section. However, 3 of the 4 drives no longer have the superblock and they refuse to assemble.

I know you've had the foresight to think of this so I'm really hoping this can be fixed.

Here is the mdadm output on the last remaining spare:

Magic : a92b4efc Version : 1.2 Feature Map : 0x4 Array UUID : 495f6668:f1e12d10:99520f92:7619b487 Name : GATEWAY:raid5_280G (local to host GATEWAY) Creation Time : Fri Jul 31 23:05:48 2009 Raid Level : raid5 Raid Devices : 4

Avail Dev Size : 586099060 (279.47 GiB 300.08 GB) Array Size : 1758296832 (838.42 GiB 900.25 GB) Used Dev Size : 586098944 (279.47 GiB 300.08 GB) Data Offset : 272 sectors Super Offset : 8 sectors State : active Device UUID : 754ae1cf:bbee0582:f660ec89:a88800d3

Reshape pos'n : 0 Delta Devices : 1 (3->4)

Update Time : Fri Aug 21 09:55:38 2009 Checksum : e18481fb - correct Events : 13581

Layout : left-symmetric Chunk Size : 64K

Device Role : spare Array State : AAAA ('A' == active, '.' == missing)

I'll keep checking this page for your input...appreciate it very much

also on running: mdadm --assemble --scan mdadm: Failed to restore critical section for reshape, sorry.

Any help will be great...

Thanks, Anshuman

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