On 08/ 4/12 09:50 PM, Eugen Leitl wrote:
On Fri, Aug 03, 2012 at 08:39:55PM -0500, Bob Friesenhahn wrote:
Extreme write IOPS claims in consumer SSDs are normally based on large
write caches which can lose even more data if there is a power failure.
Intel 311 with a good UPS would seem to be a
On 08/06/2012 10:06 PM, Erik Trimble wrote:
Honestly, I don't think this last point can be emphasized enough. SSDs
of all flavors and manufacturers have a track record of *consistently*
lying when returning from a cache flush command. There might exist
somebody out there who actually does it
It depends on the model. Consumer models are less likely to
immediately flush. My understanding that this is done in part to do
some write coalescing and reduce the number of P/E cycles. Enterprise
models should either flush, or contain a super capacitor that provides
enough power for the
On 08/07/2012 02:18 AM, Christopher George wrote:
I mean this as constructive criticism, not as angry bickering. I totally
respect you guys doing your own thing.
Thanks, I'll try my best to address your comments...
Thanks for your kind reply, though there are some points I'd like to
address,
On Mon, 6 Aug 2012, Christopher George wrote:
I mean this as constructive criticism, not as angry bickering. I totally
respect you guys doing your own thing.
Thanks, I'll try my best to address your comments...
*) At least updated benchmarks your site to compare against modern
On Tue, 7 Aug 2012, Sašo Kiselkov wrote:
MLC is so much cheaper that you can simply slap on twice as much and use
the rest for ECC, mirroring or simply overprovisioning sectors. The
common practice to extending the lifecycle of MLC is by short-stroking
it, i.e. using only a fraction of the
On 08/07/2012 04:08 PM, Bob Friesenhahn wrote:
On Tue, 7 Aug 2012, Sašo Kiselkov wrote:
MLC is so much cheaper that you can simply slap on twice as much and use
the rest for ECC, mirroring or simply overprovisioning sectors. The
common practice to extending the lifecycle of MLC is by
Very impressive iops numbers. Although I have some thoughts on the
benchmarking method itself. Imho the comparison shouldn't be raw iops
numbers on the ddrdrive itself as tested with iometer (it's only 4gb),
The purpose of the benchmarks presented is to isolate the inherent capability
of
Rossing
Cc: ZFS filesystem discussion list
Subject: Re: [zfs-discuss] what have you been buying for slog and l2arc?
On Fri, 3 Aug 2012, Karl Rossing wrote:
I'm looking at
http://www.intel.com/content/www/us/en/solid-state-drives/solid-state-
drives-ssd.html
wondering what I should get.
Are people
Are people getting intel 330's for l2arc and 520's for slog?
Unfortunately, the Intel 520 does *not* power protect it's
on-board volatile cache (unlike the Intel 320/710 SSD).
Intel has an eye-opening technology brief, describing the
benefits of power-loss data protection at:
Unfortunately, the Intel 520 does *not* power protect it's
on-board volatile cache (unlike the Intel 320/710 SSD).
Intel has an eye-opening technology brief, describing the
benefits of power-loss data protection at:
On Mon, Aug 6, 2012 at 2:15 PM, Stefan Ring stefan...@gmail.com wrote:
So you're saying that SSDs don't generally flush data to stable medium
when instructed to? So data written before an fsync is not guaranteed
to be seen after a power-down?
It depends on the model. Consumer models are less
On Mon, 6 Aug 2012, Christopher George wrote:
Intel's brief also clears up a prior controversy of what types of
data are actually cached, per the brief it's both user and system
data!
I am glad to hear that both user AND system data is stored. That is
rather reassuring. :-)
Is your
On Mon, 6 Aug 2012, Stefan Ring wrote:
Intel's brief also clears up a prior controversy of what types of
data are actually cached, per the brief it's both user and system
data!
So you're saying that SSDs don't generally flush data to stable medium
when instructed to? So data written before an
Is your DDRdrive product still supported and moving?
Yes, we now exclusively target ZIL acceleration.
We will be at the upcoming OpenStorage Summit 2012,
and encourage those attending to stop by our booth and
say hello :-)
http://www.openstoragesummit.org/
Is it well supported for Illumos?
On 08/07/2012 12:12 AM, Christopher George wrote:
Is your DDRdrive product still supported and moving?
Yes, we now exclusively target ZIL acceleration.
We will be at the upcoming OpenStorage Summit 2012,
and encourage those attending to stop by our booth and
say hello :-)
I am glad to hear that both user AND system data is stored. That is
rather reassuring. :-)
I agree!
---
[Excerpt from the linked Intel Technology Brief]
What Type of Data is Protected:
During an unsafe shutdown, firmware routines in the
On 8/6/2012 2:53 PM, Bob Friesenhahn wrote:
On Mon, 6 Aug 2012, Stefan Ring wrote:
Intel's brief also clears up a prior controversy of what types of
data are actually cached, per the brief it's both user and system
data!
So you're saying that SSDs don't generally flush data to stable medium
On Fri, Aug 03, 2012 at 08:39:55PM -0500, Bob Friesenhahn wrote:
For the slog, you should look for a SLC technology SSD which saves
unwritten data on power failure. In Intel-speak, this is called
Enhanced Power Loss Data Protection. I am not running across any
Intel SSDs which claim
hi
may be check out stec ssd
or checkout the service manual of sun zfs appliance service manual
to see the read and write ssd in the system
regards
Sent from my iPad
On Aug 3, 2012, at 22:05, Hung-Sheng Tsao (LaoTsao) Ph.D laot...@gmail.com
wrote:
Intel 311 Series Larsen Creek 20GB 2.5
On Fri, 3 Aug 2012, Neil Perrin wrote:
For the slog, you should look for a SLC technology SSD which saves
unwritten data on power failure. In Intel-speak, this is called Enhanced
Power Loss Data Protection. I am not running across any Intel SSDs which
claim to match these requirements.
-
On Fri, 3 Aug 2012, Karl Rossing wrote:
I'm looking at
http://www.intel.com/content/www/us/en/solid-state-drives/solid-state-drives-ssd.html
wondering what I should get.
Are people getting intel 330's for l2arc and 520's for slog?
For the slog, you should look for a SLC technology SSD
Intel 311 Series Larsen Creek 20GB 2.5 SATA II SLC Enterprise Solid State Disk
SSDSA2VP020G201
Average Rating
(12 reviews)
Write a Review
Sent from my iPad
On Aug 3, 2012, at 21:39, Bob Friesenhahn bfrie...@simple.dallas.tx.us wrote:
On Fri, 3 Aug 2012, Karl Rossing wrote:
I'm looking at
On 08/03/12 19:39, Bob Friesenhahn wrote:
On Fri, 3 Aug 2012, Karl Rossing wrote:
I'm looking at
http://www.intel.com/content/www/us/en/solid-state-drives/solid-state-drives-ssd.html
wondering what I should get.
Are people getting intel 330's for l2arc and 520's for slog?
For the slog,
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