[ClusterLabs] Antw: PSA Ubuntu 16.04 and OCSF2 corruption

[Kyle O'Donnell]

I'm wondering the same thing.

----- Original Message -----
From: "Ulrich Windl" <Ulrich.Windl at rz.uni-regensburg.de>
To: "users" <users at clusterlabs.org>
Sent: Tuesday, April 11, 2017 2:07:24 AM
Subject: [ClusterLabs] Antw:  PSA Ubuntu 16.04 and OCSF2 corruption

>>> Kyle O'Donnell <kyleo at 0b10.mx> schrieb am 10.04.2017 um 22:33 in Nachricht
<1870523950.17456.1491856403263.JavaMail.zimbra at 0b10.mx>:
> Hello,
> 
> Just opened what I think is a bug with the Ubuntu util-linux package:
> 
> https://bugs.launchpad.net/ubuntu/+source/util-linux/+bug/1681410 
> 
> TL;DR
> 
> The 'fstrim' command is run weekly on all filesystems.  If you're using 
> ocfs2 and the same filesystem is mounted on multiple Ubuntu 16.04 servers, 
> this fstrim is run at the same time to the same device from all servers.  I'm 
> positive this is what's causing my filesystem corruption issues, which occurs 
> a minute or two after fstrim is scheduled to run.

Without knowing the details of fstrim I think with proper locking in place, filesystem corruption should never occur. However if one node in OCFS allocated the block that another node trims (the non-locking case), you will loose that newly allocated block. I wonder whether fstrim can be used in cluster filesystems.

Regards,
Ulrich


> 
> -Kyle
> 
> _______________________________________________
> Users mailing list: Users at clusterlabs.org 
> http://lists.clusterlabs.org/mailman/listinfo/users 
> 
> Project Home: http://www.clusterlabs.org 
> Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf 
> Bugs: http://bugs.clusterlabs.org 





_______________________________________________
Users mailing list: Users at clusterlabs.org
http://lists.clusterlabs.org/mailman/listinfo/users

Project Home: http://www.clusterlabs.org
Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
Bugs: http://bugs.clusterlabs.org