Help ZFS FreeBSD 8.0 RC2 Write performance issue

[Sam Fourman Jr.]

On Thu, Nov 12, 2009 at 6:43 PM, Scott Ullrich <sullrich at gmail.com> wrote:
> On Thu, Nov 12, 2009 at 4:39 PM, Sam Fourman Jr. <sfourman at gmail.com> wrote:
>> if you wouldn't mind posting, what kind of NFS performance can you achieve?
>>
>> my application is office Fileserver (the clients are FreeBSD 8
>> diskless PXE boot)
>> so idk if it is possible to achieve gigabit NFS performance.
>> iperf is able to get ~970mbit from a client to the NFS server.
>> I realize that disk i/o is the limiting factor so I bought 6x SATA2
>> disks and a Areca card
>
> I was getting getting bursts up to 120Megaqbyte a sec but it would
> normally write at about 80MB/sec sustained.  With was great for the
> boxes configuration.  It's an old Dell 2950.

and this was with ZFS over NFS? My problem and the reason I started this thread
I am getting less than 20MB/sec writes, with 6 SATAII disks attached
to a single Arcera 1130 card

so you are suggesting that it is possible that 2x SSD disks would get
me the other 60MB/sec

Sam Fourman Jr.