Read this in GFS2 docs: mmap/splice support for journaled files (enabled by using the same on disk format as for regular files)
... 2010/11/15 Aliet Santiesteban Sifontes alietsantiesteban@gmail.com
Should I set mmap_disable = yes when storing indexes in a GFS2 shared filesystem??
2010/11/15 Aliet Santiesteban Sifontes alietsantiesteban@gmail.com
Ok, I will create a LUN also as a shared clustered storage for indexes, any
consideration to have into account when the indexes are shared by many nodes... thank you all...
2010/11/15 Timo Sirainen tss@iki.fi
On 15.11.2010, at 6.44, Aliet Santiesteban Sifontes wrote:
mail_location = sdbox:/var/vmail/%d/%3n/%n/sdbox:INDEX=/var/indexes/%d/%3n/%n
/var/vmail is shared clustered filesystem with GFS2 shared by node1 and node2
/var/indexes is a local filesystem at the node, so each node has his own /var/indexes stuff on ext3 and raid1 for improving performance, I mean each node a different /var/indexes of its own.
This is a bad idea. With dbox the message flags are only stored in index files, so if you lose indexes you lose all message flags. Users won't be happy.