Goswin von Brederlow wrote:
Miles Fidelman <mfidelman@xxxxxxxxxxxxxxxxxxxxxxxx> writes:
my root partition is raided, and is now running only on its single
spare drive:
-----
server1:~# more /proc/mdstat md2 : inactive sdd3[0] sdb3[2]
195318016 blocks
server1:~# mdadm --detail /dev/md2 [details omitted]
/dev/md2:
Raid Level : raid1
Device Size : 97659008 (93.13 GiB 100.00 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 2
Persistence : Superblock is persistent
State : active, degraded
Active Devices : 0
Working Devices : 2
Failed Devices : 0
Spare Devices : 2
Number Major Minor RaidDevice State
0 8 51 0 spare rebuilding /dev/sdd3
1 0 0 - removed
2 8 19 - spare /dev/sdb3
You have 0 active devices and only spare devices. So there is nothing
to rebuild from. Looks like on top of your one drive failing you also
have a second drive that failed in that array or wasn't added to the
raid. Or the raid was running degraded before your drive failure.
It is not running, it is inactive. There is nothing left to run.
That really is my question here... I've replaced the bad drive, and I'd
like to have it come up and resync - which would give me an array that
contains the replaced drive and the spare. I'm not sure why it's not
happening.
so..... on to questions:
1. What's going on?
2. Any suggestions on how to reassemble the array? mdadm --assemble
/dev/md2 tells me I need to deactivate the device, but then, it's my /
volume - which leaves me a little stumped
Ar you sure your / is actualy /dev/md2? Maybe you booted from
/dev/sda3 or /dev/sdc3? I recommend booting a rescue/life CD and
then look for a partition containing an active drive for md2 so you
can rebuild your raid.
pretty sure - there's a physical LVM volume defined on top of /dev/md2,
and / is a LV defined on top of that - the machine comes up and runs
Also did you know that you can run a raid1 with 3 active drives? That
way you are potected against 2 drive failures and don't need to wait
for the spare drive to resync before having fault tolerance if one
drive fails.
Can you elaborate on how to do that, particularly how to add a new
active volume to an existing array? It seems like mdadm wants to add
new disks as spares.
Thanks,
Miles
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