[Lustre-discuss] Howto map block devices to Lustre devices?

[Chris Worley]

I'm trying to deactivate some OST's, but to find them I've been
searching through /var/log/messages, as in:

# ssh io2 grep -e sde -e sdf -e sdj -e sdk -e sdd /var/log/messages"*"
| grep Server
/var/log/messages:Mar 10 13:27:54 io2 kernel: Lustre: Server
ddnlfs-OST0035 on device /dev/sdf has started
/var/log/messages.1:Mar  4 16:02:13 io2 kernel: Lustre: Server
ddnlfs-OST0030 on device /dev/sdf has started
/var/log/messages.1:Mar  6 14:34:44 io2 kernel: Lustre: Server
ddnlfs-OST002e on device /dev/sdd has started
/var/log/messages.1:Mar  6 14:34:55 io2 kernel: Lustre: Server
ddnlfs-OST002f on device /dev/sde has started
/var/log/messages.1:Mar  6 14:35:16 io2 kernel: Lustre: Server
ddnlfs-OST0030 on device /dev/sdf has started
/var/log/messages.1:Mar  6 15:20:48 io2 kernel: Lustre: Server
ddnlfs-OST002f on device /dev/sde has started
/var/log/messages.1:Mar  6 16:08:38 io2 kernel: Lustre: Server
ddnlfs-OST002e on device /dev/sdd has started
/var/log/messages.1:Mar  6 16:08:43 io2 kernel: Lustre: Server
ddnlfs-OST0030 on device /dev/sdf has started
/var/log/messages.1:Mar  6 16:08:53 io2 kernel: Lustre: Server
ddnlfs-OST0034 on device /dev/sdj has started

Note that there isn't an entry for sdk (probably rotated out), and sdf
has two different names.

Is there a better way to find the right Lustre device name map to
Linux block device?

I'm trying to cull-out slow disks.  I'm hoping that just by
"deactivating" the device in lctl, it'll quit using it, and that's the
best way to get rid of a slow drive... correct?

Thanks,

Chris