Messages in this thread | | | Subject | Re: unkillable processes using samba, xfs and lvm2 snapshots (k 2.6.10) | From | Julien BLACHE <> | Date | Wed, 29 Dec 2004 19:01:43 +0100 |
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Gildas LE NADAN <gildas.le-nadan@inha.fr> wrote:
> I experience hangs on samba processes on a filer using xfs over lvm2 > as data partitions, when there is active snapshots of the xfs > partitions.
Your problem probably lies between lvm2 and XFS. I got the same problems this summer while doing the exact same thing.
The server would just completely hang once I started doing lvm snapshots: -> at the beginning, the snapshots would work OK, but XFS would hang when accessing the filesystem afterwards -> after a while (usually 2 or 3 snapshots, and I was taking a snapshot every 2 hours), the snapshot would not complete, and then only a hard reboot would work
I was doing the snapshots from a crontab, the script used xfs_freeze to freeze the filesystem before doing the snapshot (and unfreeze it afterwards, of course). Sometimes xfs_freeze -u would hang too (but at this time, the server was in a pretty bad state already).
The server wasn't loaded at all, we were doing some reads/writes through samba to have some modified files lying around, but we were mainly prototyping the server, not stress-testing it.
LVM and XFS just don't play nice together when it comes to snapshots, I thought it had been fixed already, but it's not the case, as we both know...
(I can't remember the kernel version, it could have been a 2.4 kernel, but I was using LVM2 and the latest XFS code available)
Feel free to correct me if I did something wrong (but AFAIK I took care of everything, knowing there could have been bad interactions between LVM and XFS).
JB.
-- Julien BLACHE <http://www.jblache.org> <jb@jblache.org> GPG KeyID 0xF5D65169 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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