Hello Greg,
I'm curious how much performance benefit you gain from the ZIL accelerator.
Have you measured that? If not, do you have a gut feel about how much it
helped? Also, for what kind of applications does it help?
(I know it helps with synchronous writes. I'm looking for real world
answers like: "Our XYZ application was running like a dog and we added an
SSD for ZIL and the response time improved by X%.")
Of course, I would welcome a reply from anyone who has experience with this,
not just Greg.
Monish
----- Original Message -----
From: "Greg Mason" <gma...@msu.edu>
To: "HUGE | David Stahl" <dst...@hugeinc.com>
Cc: "zfs-discuss" <zfs-discuss@opensolaris.org>
Sent: Thursday, August 20, 2009 4:04 AM
Subject: Re: [zfs-discuss] Ssd for zil on a dell 2950
Hi David,
We are using them in our Sun X4540 filers. We are actually using 2 SSDs
per pool, to improve throughput (since the logbias feature isn't in an
official release of OpenSolaris yet). I kind of wish they made an 8G or
16G part, since the 32G capacity is kind of a waste.
We had to go the NewEgg route though. We tried to buy some Sun-branded
disks from Sun, but that's a different story. To summarize, we had to
buy the NewEgg parts to ensure a project stayed on-schedule.
Generally, we've been pretty pleased with them. Occasionally, we've had
an SSD that wasn't behaving well. Looks like you can replace log devices
now though... :) We use the 2.5" to 3.5" SATA adapter from IcyDock, in a
Sun X4540 drive sled. If you can attach a standard sata disk to a Dell
sled, this approach would most likely work for you as well. Only issue
with using the third-party parts is that the involved support
organizations for the software/hardware will make it very clear that
such a configuration is quite unsupported. That said, we've had pretty
good luck with them.
-Greg
--
Greg Mason
System Administrator
High Performance Computing Center
Michigan State University
HUGE | David Stahl wrote:
We have a setup with ZFS/ESX/NFS and I am looking to move our zil to a
solid state drive.
So far I am looking into this one
http://www.newegg.com/Product/Product.aspx?Item=N82E16820167013
Does anyone have any experience with this drive as a poorman’s logzilla?
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