From: Deano [mailto:de...@rattie.demon.co.uk]
Hi Edward,
Do you have a source for the 8KiB block size data? whilst we can't avoid
the
SSD controller in theory we can change the smallest size we present to the
SSD to 8KiB fairly easily... I wonder if that would help the controller do
a
From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss-
boun...@opensolaris.org] On Behalf Of Eff Norwood
We tried all combinations of OCZ SSDs including their PCI based SSDs and
they do NOT work as a ZIL. After a very short time performance degrades
horribly and for the OCZ drives
...@opensolaris.org] On Behalf Of Edward Ned Harvey
Sent: 28 January 2011 13:25
To: 'Eff Norwood'; zfs-discuss@opensolaris.org
Subject: Re: [zfs-discuss] Lower latency ZIL Option?: SSD behind Controller
BB Write Cache
From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss-
boun...@opensolaris.org
Comments below.
On 29 January 2011 00:25, Edward Ned Harvey
opensolarisisdeadlongliveopensola...@nedharvey.com wrote:
This was something interesting I found recently. Apparently for flash
manufacturers, flash hard drives are like the pimple on the butt of the
elephant. A vast majority of
On Fri, Jan 28 at 8:25, Edward Ned Harvey wrote:
From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss-
boun...@opensolaris.org] On Behalf Of Eff Norwood
We tried all combinations of OCZ SSDs including their PCI based SSDs and
they do NOT work as a ZIL. After a very short time
We tried all combinations of OCZ SSDs including their PCI based SSDs and they
do NOT work as a ZIL. After a very short time performance degrades horribly and
for the OCZ drives they eventually fail completely. We also tried Intel which
performed a little better and didn't flat out fail over
Chris Eff,
Thanks for your expertise on this and other posts. Greatly appreciated. I've
just been re-reading some of the great SSD-as-ZIL discussions.
Chris,
Cost: Our case is a bit non-representative as we have spare P410/512's that
came with ESXi hosts (USB boot) so I've budgetted them at
They have been incredibly reliable with zero downtime or issues. As a result,
we use 2 in every system striped. For one application outside of VDI, we use a
pair of them mirrored, but that is very unusual and driven by the customer and
not us.
--
This message posted from opensolaris.org
I’m wondering if any of the ZIL gurus could examine the following and point out
anywhere my logic is going wrong.
For small backend systems (e.g. 24x10k SAS Raid 10) I’m expecting an absolute
maximum backend write throughput of 1 seq IOPS** and more realistically
2000-5000. With
ZIL OPTIONS: Obviously a DDRdrive is the ideal (36k 4k random
IOPS***) but for the same budget I can get 2x Vertex 2 EX 50GB
drives and put each behind it’s own P410 512MB BBWC controller.
The Vertex 2 EX goes for approximately $900 each online, while the
P410/512 BBWC is listed at HP for
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