Oracle Solaris ZFS File System (MOSC)

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When is it safe to enable the COMSTAR writeback cache?

edited Oct 14, 2015 2:49PM in Oracle Solaris ZFS File System (MOSC) 3 commentsAnswered

I am using COMSTAR to turn my ZFS zvols into fibre-channel targets. By default, the "writeback cache" is enabled. This significantly improves write performance (5X or more). I am wondering what risks I am accepting if I leave the writeback cache enabled -- and can any of them be mitigated.

If it matters a whole lot, this is my configuration:

Single Dell PE R720 running Solaris 11.2.

Qlogic QLE2562 dual 8Gb FC HBA

SAS attached Seagate Xyratex 84-disk enclosure.

I do not have separate ZIL / log devices.

The FC client is running Linux / CentOS 6.

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