[dm-devel] Stopped disk causes LVM to go crazy

[Nuno Fernandes]

On Wednesday 11 February 2009 20:04:46 Alireza Nematollahi wrote:
> Hello,
>
> I think I did it in order:
> 1- nothing is mounted
>
> > mount
>
> rootfs on / type rootfs (rw)
> proc on /proc type proc (rw)
> sysfs on /sys type sysfs (rw)
> devpts on /dev/pts type devpts (rw)
> tmpfs on /dev/shm type tmpfs (rw)
> rpc_pipefs on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
> nfsd on /proc/fs/nfsd type nfsd (rw)
>
> 2- deactivating VG/LVs
>
> > vgchange -an disk2
>
> 3- stop the storage
>
> > sdparm -C stop /dev/sdb
>
> 4- checking for LVs on other disk
>
> > lvscan
>
> Isn't it the right order? I'm new to LVM and that's why I may be
> confused...
>
> I don't like doing "echo 1 > /sys/block/sdb/device/delete" since I can't
> get the device restarted when I do sdparm -C start /dev/sdb...
>
> Thanks
>
>
>
> ----- Original Message -----
> From: "Bryn M. Reeves" <bmr at redhat.com>
> To: "Alireza Nematollahi" <alirezan at sfu.ca>
> Cc: "device-mapper development" <dm-devel at redhat.com>
> Sent: Wednesday, February 11, 2009 10:50:45 AM GMT -08:00 US/Canada Pacific
> Subject: Re: [dm-devel] Stopped disk causes LVM to go crazy
>
> Alireza Nematollahi wrote:
> > hi. Thanks for your reply. Well, I had tried that before, but no luck. I
> > tried it again, and still no luck:
>
> You have to do it *BEFORE* you disable/remove the storage. Doing it
> afterwards will just throw all the errors you are seeing since the LVM
> tools can no longer access the device.
>
> You have to do things in the correct order; first unmount any file
> systems, then de-activate LVs/VGs, then stop or remove the storage
> hardware.
>
> If you do this in the wrong order you'll end up with the problems
> you're seeing.
>
> For now, you can clean up /dev/sdb by deleting it via sysfs:
>
> echo 1 > /sys/block/sdb/device/delete
>
> Which will stop other commands that scan the disks from tripping over
> the dead device. You can also manually delete any remaining device
> mapper devices that reference the removed disk (see similar thread
> yesterday).

Add /dev/sdb to the filter so that it doesn't get scanned...

lvm.conf:
    filter = [ "r/sdb/", "a/.*/" ]

Best regards,
./npf


>
> Regards,
> Bryn.


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