[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
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
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.
participants (3)
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Aliet Santiesteban Sifontes
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Robert Schetterer
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Timo Sirainen