Re: [Dovecot] Local node indexes in a cluster backend with GFS2
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.
Re: [Dovecot] Local node indexes in a cluster backend with GFS2
Should I set mmap_disable = yes when storing indexes in a GFS2 shared filesystem?? 2010/11/15 Aliet Santiesteban Sifontes alietsantieste...@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 t...@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.
Re: [Dovecot] Local node indexes in a cluster backend with GFS2
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 alietsantieste...@gmail.com Should I set mmap_disable = yes when storing indexes in a GFS2 shared filesystem?? 2010/11/15 Aliet Santiesteban Sifontes alietsantieste...@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 t...@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.
Re: [Dovecot] Local node indexes in a cluster backend with GFS2
You could try, but mmap_disable=yes might be faster (or might not). On 15.11.2010, at 20.30, Aliet Santiesteban Sifontes wrote: 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 alietsantieste...@gmail.com Should I set mmap_disable = yes when storing indexes in a GFS2 shared filesystem?? 2010/11/15 Aliet Santiesteban Sifontes alietsantieste...@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 t...@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.
[Dovecot] Local node indexes in a cluster backend with GFS2
Hi, all this days I'm testing a dovecot setup using lvs, director and a cluster email backend with two nodes using rhel5 and gfs2. In the two nodes of the email backend I configured mail location this way: 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. Now, if the director was using node2 for the email for user1 and I removed node2 now all the connections for that user are redirected to node1, that node has its local /var/indexes, when this ocurr I can not see the emails that in fact are in the mailboxes, I guess should be indexes not current with the user mails. Is supposed indexes to be rebuilt automatically when the node switches?? Or I have to configure the indexes in the shared storage so the two node update the information concurrently? I will appreciate your help... best regards
Re: [Dovecot] Local node indexes in a cluster backend with GFS2
Am 15.11.2010 07:44, schrieb Aliet Santiesteban Sifontes: Hi, all this days I'm testing a dovecot setup using lvs, director and a cluster email backend with two nodes using rhel5 and gfs2. In the two nodes of the email backend I configured mail location this way: 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. Now, if the director was using node2 for the email for user1 and I removed node2 now all the connections for that user are redirected to node1, that node has its local /var/indexes, when this ocurr I can not see the emails that in fact are in the mailboxes, I guess should be indexes not current with the user mails. Is supposed indexes to be rebuilt automatically when the node switches?? Or I have to configure the indexes in the shared storage so the two node update the information concurrently? I will appreciate your help... best regards i have indexes on the cluster storage, in users mailbox dirs i speculate having another index storage which isnt at cluster may lead into trouble i some cases, but Timo will know exactly i think -- Best Regards MfG Robert Schetterer Germany/Munich/Bavaria
