[ClusterLabs] Antw: PSA Ubuntu 16.04 and OCSF2 corruption

[Ulrich Windl]

>>> 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
> 
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