Read this http://wiki.dovecot.org/MailLocation/SharedDisk
If you were running Dovecot on the Thumper, mmap has issues under ZFS, old versions of ZFS (not sure if it is fixed in Sol10), so switch this off mmap_disable = yes as per the URL above for over NFS. Ensure NFS is tuned to 32K read and 32k writes (this will not help much because dovecot does small I/O, its the default on Solaris Clients, not Linux), use Jumbo frames if you can, use NFSv4. You could create a Caching NFS file system on the clients if they are Solaris. I assume the backups are not over NFS. The other choice is to run Dovecot on the Thumper. I beleive the MailDir format from DoveCot is only ever written once, if it is re-write the Mail Client is updating the email (and the whole email should be rewritten efectively) . At home Headers within emails 100% < 1k, 64% of email bodies are under 16k, 4% > 128k. I am surprised that 8k would help Given the files are not updated, the effective record size for a file will be the file size. A small record size might help with the indexes. Is the system running recent patches? -- This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
