Areca vs. ZFS performance testing.

[Koen Smits]

Those numbers are pretty good, right? Who needs onboard XOR anyway :)

On Fri, Jan 9, 2009 at 03:30, Danny Carroll <fbsd at dannysplace.net> wrote:

> Koen Smits wrote:
> > My guess is it probably has to do with the way ZFS does cache flushes:
> >
> http://www.solarisinternals.com/wiki/index.php/ZFS_Evil_Tuning_Guide#Cache_Flushes
> > It might be worth it to disable the forced flushing and test again, if
> > you feel like it.
>
> I've just done this and the results are on the same page:
>
> http://www.dannysplace.net/quickweb/filesystem%20tests.htm
> The Excel version is here:
>
> http://www.dannysplace.net/quickweb/filesystem%20tests.xls
>
> It is a major improvement but I do not know 100% for sure if the disks
> are protected by the write cache/battery backup when in Passthrough mode.
>
> When creating a passthrough disk the "Volume Cache Mode" can be set to
> "Write Back" or "Write Through".  This makes me feel as though the cache
> is being used and that when the cache is used, so is the BBU.    But I
> cannot be 100% sure.  I will send an email to Areca support to ask.
>
> -D
>