All,
I have a raid10 that failed recently due to a failed drive slot. The
drive is good from what I can tell. In theory it is rebuilding now.
1) Once the current recovery process finishes, are there any commands
I can (should) issue to make sure the array is consistent. I'm afraid
my mirror halves won't really be in sync.
2) If I want to pause the recovery and do some production real, can I
do that? How?
== details
Not sure why but each of the members dropped one by one until the
raid10 went offline.
I likely did something wrong by now, but I currently have it in this state:
md127 : active raid10 sdb5[4] sda5[0] sdc3[5] sdd3[2]
923517952 blocks super 1.2 512K chunks 2 near-copies [4/3] [UUU_]
[>....................] recovery = 0.8% (4117760/461758976)
finish=1373.3min speed=5553K/sec
(it used to be md2. No idea where md127 came from. There are only 4
md's on the machine.)
It's currently providing a usable volume I think. I just rebooted the
machine and the filesystem looks good at first glance.
The recovery looks very slow to me, but maybe I still have hardware issues.
The first 2 members forming a raid 1 immediately after being told
makes since to me. I don't understand how the 3rd member got sync'ed
up so fast. It seemed to be instantaneous and I don't think it was in
sync.
Originally it was a raid10 with
sda5 mirrored to sdb5
sdc3 mirrored to sdd3
(or so I believe)
Immediately after the failure I had nothing, so I did:
# mdadm --stop /dev/md2
# mdadm --create /dev/md2 -v --assume-clean --level=raid10
--raid-devices=4 /dev/sda5 missing /dev/sdd3 missing
(or similar, my sdX names have been changing as this event progresses.
These names are based on what I see in mdstat.)
I ran that way for a day, which is why I really don't think either of
the missing mirror halves should have immediately sync'ed.
Anyway, I have a backup but I prefer not to use it if it can be
avoided. (the machine is in sporadic production, for an hour or two
at a time, and going offline for a day to recreate it from scratch
does not sound like fun.)
Thanks
Greg
--
Greg Freemyer
Head of EDD Tape Extraction and Processing team
Litigation Triage Solutions Specialist
http://www.linkedin.com/in/gregfreemyer
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The Norcross Group
The Intersection of Evidence & Technology
http://www.norcrossgroup.com
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