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ZFS cache and ZFS log

Posted: 17 Mar 2014 23:22
by Tharbad
Hi all,

What's the difference? Assuming I need more RAM for dedup and I can't add more RAM...

Thanks

Re: ZFS cache and ZFS log

Posted: 18 Mar 2014 09:02
by crowi
Hi Tharbad,

the rule of thumb is 1GB RAM for 1TB disk space if you need dedup.

ZFS cache is write cache, also called ZIL, and ZFS log is read cache also called L2ARC.
More information here
http://en.wikipedia.org/wiki/ZFS#ZFS_ca ... ARC.2C_ZIL
and here
http://forums.freenas.org/index.php?thr ... oobs.7775/

Cheers,

Crowi

Re: ZFS cache and ZFS log

Posted: 18 Mar 2014 19:39
by Tharbad
That presentation is very good one. I wonder why I only see it now. It should be linked to from the wiki.

Another source for ZFS can be found here (This is the developer's wiki):
http://wiki.openindiana.org/oi/ZFS

Thanks