Expanding megaraid with LVM on bought me trouble. [Solved]

Pontus Pihlgren pontus.pihlgren at farmbio.uu.se
Thu Oct 11 08:18:02 CDT 2007

Hi again.

It was too obvious to realize. Just deactivating the volumegroup:

vgchange -an Archive_VG

And reactivating:

vgchange -ay Archive_VG

did the trick.


tor 2007-10-11 klockan 14:27 +0200 skrev Pontus Pihlgren:
> Hi All.
> I've got a MD1000 with one RAID-5 array, and a single disc. I wanted to
> add create a RAID-5 array of the single disc as well, so I added two
> more discs and did a "reconfigure" through the OMSA online interface. It
> worked lika a charm, as it has done few times before. It only took some
> time :)
> The next step was to notify the kernel that the disk has expanded. I
> followed the steps in Matt's and Michaels article here:
> http://www.dell.com/content/topics/global.aspx/power/en/ps1q03_michael
> So I typed in the following:
> echo "scsi remove-single-device 1 2 1 0" > /proc/scsi/scsi
> echo "scsi add-single-device 1 2 1 0" > /proc/scsi/scsi
> Which also worked fine, almost! the disk was previously known as
> "/dev/sdc" but now it is visible as "/dev/sdd".
> Now when I try to mount the logical volume I get this:
> mount: wrong fs type, bad option, bad superblock on /dev/Archive_VG/Archive_LV,
>        or too many mounted file systems
> I also get these messages in /var/log/messages:
> scsi1 (1:0): rejecting I/O to dead device
> EXT2-fs: unable to read superblock
> Running the graphical "system-config-lvm" program that ships with centos
> gives me a bunch of these messages (but still gives me sane information
> about Archive_VG and Archive_LV):
> Buffer I/O error on device dm-2, logical block 0
> I guess LVM or device-mapper still looks for /dev/sdc. How can I get it
> to recognize the changes?
> Would a symlink from /dev/sdd to /dev/sdc work? And what would happen on
> a reboot?
> I guess this would fix itself if I restarted the machine, but I would
> like to avoid that for as long as possible.
> Thank You,
> Pontus.
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