On Sun, 25 Sep 2011 21:23:31 -0700 "Kenn" <kenn@xxxxxxx> wrote: > I have a raid5 array that had a drive drop out, and resilvered the wrong > drive when I put it back in, corrupting and destroying the raid. I > stopped the array at less than 1% resilvering and I'm in the process of > making a dd-copy of the drive to recover the files. I don't know what you mean by "resilvered". > > (1) Is there anything diagnostic I can contribute to add more > wrong-drive-resilvering protection to mdadm? I have the command history > showing everything I did, I have the five drives available for reading > sectors, I haven't touched anything yet. Yes, report the command history, and any relevant kernel logs, and the output of "mdadm --examine" on all relevant devices. NeilBrown > > (2) Can I suggest improvements into resilvering? Can I contribute code to > implement them? Such as resilver from the end of the drive back to the > front, so if you notice the wrong drive resilvering, you can stop and not > lose the MBR and the directory format structure that's stored in the first > few sectors? I'd also like to take a look at adding a raid mode where > there's checksum in every stripe block so the system can detect corrupted > disks and not resilver. I'd also like to add a raid option where a > resilvering need will be reported by email and needs to be started > manually. All to prevent what happened to me from happening again. > > Thanks for your time. > > Kenn Frank > > P.S. Setup: > > # uname -a > Linux teresa 2.6.26-2-686 #1 SMP Sat Jun 11 14:54:10 UTC 2011 i686 GNU/Linux > > # mdadm --version > mdadm - v2.6.7.2 - 14th November 2008 > > # mdadm --detail /dev/md3 > /dev/md3: > Version : 00.90 > Creation Time : Thu Sep 22 16:23:50 2011 > Raid Level : raid5 > Array Size : 2930287616 (2794.54 GiB 3000.61 GB) > Used Dev Size : 732571904 (698.64 GiB 750.15 GB) > Raid Devices : 5 > Total Devices : 4 > Preferred Minor : 3 > Persistence : Superblock is persistent > > Update Time : Thu Sep 22 20:19:09 2011 > State : clean, degraded > Active Devices : 4 > Working Devices : 4 > Failed Devices : 0 > Spare Devices : 0 > > Layout : left-symmetric > Chunk Size : 64K > > UUID : ed1e6357:74e32684:47f7b12e:9c2b2218 (local to host teresa) > Events : 0.6 > > Number Major Minor RaidDevice State > 0 33 1 0 active sync /dev/hde1 > 1 56 1 1 active sync /dev/hdi1 > 2 0 0 2 removed > 3 57 1 3 active sync /dev/hdk1 > 4 34 1 4 active sync /dev/hdg1 > >
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