Does un-taring something count? It is what I used for our tests.
I tested with ZIL disable, zil cache on /tmp/zil, CF-card (300x) and
cheap SSD. Waiting for X-25E SSDs to arrive for testing those:
If you want a quick answer, disable ZIL (you need to unmount/mount,
export/import or reboot) on your ZFS volume and try it. That is the
theoretical maximum. You can get close to this using various
technologies, SSD and all that.
I am no expert on this, I knew nothing about it 2 weeks ago.
But for our provisioning engine to untar Movable-Types for customers, 5
mins to 45secs is quite an improvement. I can get that to 11seconds
theoretically. (ZIL disable)
Monish Shah wrote:
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
(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.
----- Original Message ----- From: "Greg Mason" <gmason@xxxxxxx>
To: "HUGE | David Stahl" <dstahl@xxxxxxxxxxx>
Cc: "zfs-discuss" <zfs-discuss@xxxxxxxxxxxxxxx>
Sent: Thursday, August 20, 2009 4:04 AM
Subject: Re: [zfs-discuss] Ssd for zil on a dell 2950
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.
Jorgen Lundman | <lundman@xxxxxxxxxxx>
Unix Administrator | +81 (0)3 -5456-2687 ext 1017 (work)
Shibuya-ku, Tokyo | +81 (0)90-5578-8500 (cell)
Japan | +81 (0)3 -3375-1767 (home)
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