Hello!
On Mar 18, 2010, at 1:36 PM, Roy Dragseth wrote:
> Is it possible to fsck on a disabled and drained OST that is mounted readonly?
> We need to fsck an OST and would like to avoid a lengthy downtime while doing
> it. My plan is to disable and drain the files from the OST and then remount
> it
> read-only before running fsck on the partition. This would allow for the
> system being online during this operation instead of hanging on all df
> commands etc. But is it at all possible to do it this way? I would like to
> avoid any large scale catastrophic events...
You can just disable a specific ost with a command like
lctl conf_param ${fs_name}-OST${NUM}.osc.activate=0
That'd propagate to all clients and even if you bring that ost down later on,
client's won't hang but rather would return an i/o error trying to read/write
data
from that OST. df would just stop counting usage (both free and used) from that
ost.
After you are done, execute same command, but make it =1 to reenable the OST
everywhere.
Bye,
Oleg
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