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ZFS cache and ZFS log

New installs of XigmaNAS.
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Tharbad
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ZFS cache and ZFS log

Post by Tharbad »

Hi all,

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

Thanks
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crowi
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Re: ZFS cache and ZFS log

Post 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
NAS 1: Milchkuh: Asrock C2550D4I, Intel Avoton C2550 Quad-Core, 16GB DDR3 ECC, 5x3TB WD Red RaidZ1 +60 GB SSD for ZIL/L2ARC, APC-Back UPS 350 CS, NAS4Free 11.0.0.4.3460 embedded
NAS 2: Backup: HP N54L, 8 GB ECC RAM, 4x4 TB WD Red, RaidZ1, NAS4Free 11.0.0.4.3460 embedded
NAS 3: Office: HP N54L, 8 GB ECC RAM, 2x3 TB WD Red, ZFS Mirror, APC-Back UPS 350 CS NAS4Free 11.0.0.4.3460 embedded
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Tharbad
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Re: ZFS cache and ZFS log

Post 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

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