[NBLUG/talk] LVM, Raid, Ubuntu 9.10 - looking for recovery help

[Travis Sharp]

I don't know if this would help a raid setup, but have you tried to run
fsck on the troublesome disk?

On Fri, 2010-01-22 at 15:44 -0800, Glen Gunsalus wrote:
> Ok, looking for some help/pointers on recovering from apparent disk read error.
> 
> I recently set up a server using ubuntu 9.10 (64bit) and configured with Raid 
> 1 and LVM.  Maybe a mistake?
> 
> This is a Dell 5150 with Intel 2.8GHz dual core EM64T, 4Gb RAM and two 250GB 
> Seagate SATA drives.
> 
> It failed to boot this morning with the error:
> 
> GRUB loading.
> error: no such disk
> 
> Checked setup and the two drives are seen by bios
> 
> Did Dell hard drive diagnostic (from the boot menu - F12 on startup) and get:
> 
> Drive 0: ST3250410AS - Fail.  Return Code:  7
> Drive 1: ST3250410AS - Pass
> 
> Some sniffing around points to disk read error (although lots of M$ related 
> misinformation to sift through).
> 
> So... hoping both disks fully mirrored and had boot code in MBR, swapped 
> drives - no joy.  Thought I wrote to MBRs on both at configuration, but I'm 
> new to this and undoubtedly missed.
> 
> popped in the 9.1064bitserver install cd and went into rescue mode.
> 
> When asked for device to use as root file system, I get the two drives (with 3 
> partitions each (see below)), all the LVs and /dev/md0.
> 
> At this point I chose the lv root device (/dev/gv-ubuntu-9/root).
> 
> Long time -- difficulty reading drive??
> 
> Chose "Execute a shell in /de/gv-ubuntu-9/root" and doesn't go (long wait then 
> back to choice for shell execution).
> 
> Sooo... choose execute shell in install space (not the precise choice, but 
> can't go  back easily just now).
> 
> fdisk and fsdisk show the partitions on sda and sdb:
> 
> sfdisk -l /dev/sda
> 
> Disk /dev/sda: 30401 cylinders, 255 heads, 63 sectors/track
> Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0
> 
>    Device Boot Start     End    #cyls    #blocks    Id  System
> /dev/sda1   *      0+   30369   30370-  243946993+  8e  Linux LVM
> /dev/sda2      30370    30400      31      249007+   5  Extended
> /dev/sda3          0        -       0           0    0  Empty
> /dev/sda4          0        -       0           0    0  Empty
> /dev/sda5      30370+   30400      31-     248976   fd  Linux raid autodetect
> 
> for /dev/sdb - substitute "b" for "a" above - all else identical
> 
> lvdisplay shows all the lv's
> 
> Ok, anything that needs disk read can be really slow (sorta sporadic though) 
> so looks like incipient disk failure of sda.
> 
> Now what?
> 
> Can I somehow make the second disk?
> Then move to sata-0 (leave out the second disk)
> set up new disk and mirror ?
> 
> 
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