[mythtv-users] OT Help: mdadm segfault
Steve MacLaren
scram69 at gmail.com
Thu Sep 20 04:31:03 UTC 2007
On 9/18/07, f-myth-users at media.mit.edu <f-myth-users at media.mit.edu> wrote:
>
> > Date: Tue, 18 Sep 2007 09:40:30 -0700
> > From: "Steve MacLaren" <scram69 at gmail.com>
>
> > It hadn't occurred to me, but now that I think about it, it's not
> all that
> > far-fetched. I only saw the segfault message once; now that I can
> reliably
> > boot on the -15 kernel, it no longer shows up in the message
> log. I've gone
> > ahead and ordered a new PSU. In the mean time, I'll try dd'ing each
> drive
> > like you mentioned.
>
> I'll be curious to know what the real problem turns out to be...
> _______________________________________________
Unfortunately, it wasn't the PSU. I replaced it with a brand new 550W (the
old one was 500W) and saw the same thing, i.e. the system reboots ~10
seconds after assembling the array.
If I physically unplug the power to one of the disks, mdadm.conf will
assemble the remaining three disks into /dev/md0 on boot, but it won't
mount. Here's what I see:
steve at mediaserver:~$ sudo mdadm --detail /dev/md0
Password:
/dev/md0:
Version : 00.90.03
Creation Time : Mon May 7 21:31:55 2007
Raid Level : raid5
Device Size : 488383872 (465.76 GiB 500.11 GB)
Raid Devices : 4
Total Devices : 3
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Wed Sep 12 15:58:54 2007
State : active, degraded, Not Started
Active Devices : 3
Working Devices : 3
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 128K
UUID : bc7a4d90:bd286a91:c109596b:d7e29b7e (local to host
mediaserver)
Events : 0.161
Number Major Minor RaidDevice State
0 8 1 0 active sync /dev/sda1
1 8 17 1 active sync /dev/sdb1
2 0 0 2 removed
3 8 33 3 active sync /dev/sdc1
Then,
steve at mediaserver:~$ sudo mount -t xfs /dev/md0 /var/lib/mythtv
mount: /dev/md0: can't read superblock
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