[Lustre-devel] [RFC] "lctl readonly" modification proposal

[Andreas Dilger <adilger@sun.com>]

On Aug 28, 2008  10:11 -0700, Nathaniel Rutman wrote:
> Andreas Dilger wrote:
> >>> I'd be thrilled if this was fixed so a normal shutdown did not do a
> >>> "force" unmount and set the device read-only, because that would also
> >>> avoid leaving the journal needing recovery.
>
> umount does either force or failover shutdown; failover sets readonly 
> but force does not.  Test-framework regularly does both.  Andreas, if 
> you want to avoid journal recovery, use umount -f.

Well, issue is that with normal mount/unmount the filesystem is always
dirty and needs journal recovery.  Also, for the DMU, where we will
likely not have "read-only" support we need to be able to just block
all client transactions and flush everything to disk, doing a normal
shutdown.

Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.