Re: /var/spool/imap on ZFS
"Andre Felipe Machado" <[email protected]>
| Newsgroups | gmane.mail.imap.cyrus |
|---|---|
| Message-ID | <[email protected]> |
Hello, Some suggestions for general guidance: - Avoid deduplication. Maybe use compression at low level or fast algorithm to get dedup effect ALSO. With compression you get dynamic sector size also. - RAIDZn is for space, not for performance. Beware. - RAIDZn is not cheap to expand. - Place your indexes/metadata at different zpool of disks/ssd configured for absolute max performance. Indexes and metadata are "small" compared to data. Up to 20%. - RAM, more RAM, much more RAM. Did you get RAM? Is not enough. Buy more RAM. - Buy the fastest SLOG device you could. ZeusRAM is one of the suggestions. - Cyrus most writes are simultaneus variable size small random synchronous. THE nightmare for all filesystems and storage. Keep in mind. - maybe this article could help with some info: http://www.techforce.com.br/content/zfs-part-4-multithreaded-sustained-random-small-files-synchronous-write-iops Good luck. Andre Felipe Mikhail T. <[email protected]> wrote .. I'd like to move my current spool from a single (fast) disk to ZFS. Any suggestions for the filesystem-parameters? Do I want deduplication, for example? Compression? Recordsize? Thanks! -mi ---- Cyrus Home Page: http://www.cyrusimap.org/ List Archives/Info: http://lists.andrew.cmu.edu/pipermail/info-cyrus/ To Unsubscribe: https://lists.andrew.cmu.edu/mailman/listinfo/info-cyrus