zfs with a bunch of drives
Dennis Glatting
dg17 at penx.com
Sun Jan 8 18:17:48 UTC 2012
On Sun, 2012-01-08 at 10:56 -0500, Randy Bush wrote:
> we want to build a new 16-drive RELENG_9 server on which we intend to
> run a bunch of vboxen. a couple of years ago, we built a 16-drive
> server. based on advice here not to just do a big raidz, it was
> configured as eight mirrors
>
> tank ONLINE 0 0 0
> mirror ONLINE 0 0 0
> label/m00-d01 ONLINE 0 0 0
> label/m00-d00 ONLINE 0 0 0
> mirror ONLINE 0 0 0
> label/m01-d00 ONLINE 0 0 0
> label/m01-d01 ONLINE 0 0 0
>
> and so forth. is this still the best advice for performance?
>
> and is there a url for building a bootable RELENG_9 zfs-only system?
> last i looked there were a half dozen all somewhat different.
>
I would do a performance measurement against a three drive RAIDz with
cache verses a simple mirror. Of course performance is based on data but
I've found RAIDz a better performer than RAID5 on blocky I/O, which
I /think/ is the type of I/O you'd see under vboxen.
I've taken data on a simple mirror verses RAIDz/2/3 but I no longer have
it.
> thanks for clue.
>
> randy
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