> From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss-
> boun...@opensolaris.org] On Behalf Of Cooper Hubbell
> Regarding the writeback cache on disks, what is the recommended method
> to disable the cache?  Through HBA firmware, or via Solaris?

It's the same either way - You press Ctrl-R (or whatever) during bootup and 
disable the writeback in the perc BIOS...  Or you use MegaCLI, which does the 
same thing from within the OS.

But again, I would only recommend disabling the writeback if you have either a 
dedicated SSD log device (or equivalent or faster), ... Or if you disable the 
ZIL completely (sync=disabled property).  Because if you actually have ZIL and 
use spindle disks for ZIL, then the writeback cache is a big improvement over 

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