Hi
Intel X-25 M are MLC not SLC, there are very good for L2ARC.
and next, you need more RAM:
ZFS can't handle 4x 80 Gb of L2ARC with only 4Gb of RAM because ZFS
use memory to allocate and manage L2ARC.
2010/2/10 Felix Buenemann felix.buenem...@googlemail.com:
Am 09.02.10 09:58, schrieb Felix
Hi Mickaël,
Am 12.02.10 13:49, schrieb Mickaël Maillot:
Intel X-25 M are MLC not SLC, there are very good for L2ARC.
Yes, I'm only using those for L2ARC, I'm planing on getting to Mtron Pro
7500 16GB SLC SSDs for ZIL.
and next, you need more RAM:
ZFS can't handle 4x 80 Gb of L2ARC with
On Feb 12, 2010, at 8:20 AM, Felix Buenemann wrote:
Hi Mickaël,
Am 12.02.10 13:49, schrieb Mickaël Maillot:
Intel X-25 M are MLC not SLC, there are very good for L2ARC.
Yes, I'm only using those for L2ARC, I'm planing on getting to Mtron Pro 7500
16GB SLC SSDs for ZIL.
and next, you
Am 12.02.10 18:17, schrieb Richard Elling:
On Feb 12, 2010, at 8:20 AM, Felix Buenemann wrote:
Hi Mickaël,
Am 12.02.10 13:49, schrieb Mickaël Maillot:
Intel X-25 M are MLC not SLC, there are very good for L2ARC.
Yes, I'm only using those for L2ARC, I'm planing on getting to Mtron Pro 7500
On 02/12/10 09:36, Felix Buenemann wrote:
given I've got ~300GB L2ARC, I'd
need about 7.2GB RAM, so upgrading to 8GB would be enough to satisfy the
L2ARC.
But that would only leave ~800MB free for everything else the server
needs to do.
- Bill
On Feb 12, 2010, at 9:36 AM, Felix Buenemann wrote:
Am 12.02.10 18:17, schrieb Richard Elling:
On Feb 12, 2010, at 8:20 AM, Felix Buenemann wrote:
Hi Mickaël,
Am 12.02.10 13:49, schrieb Mickaël Maillot:
Intel X-25 M are MLC not SLC, there are very good for L2ARC.
Yes, I'm only using
On Fri, Feb 12, 2010 at 11:26:33AM -0800, Richard Elling wrote:
Mathing aorund a bit, for a 300 GB L2ARC (apologies for the tab separation):
size (GB) 300
size (sectors) 585937500
labels (sectors)9232
available
G'Day,
On Sat, Feb 13, 2010 at 09:02:58AM +1100, Daniel Carosone wrote:
On Fri, Feb 12, 2010 at 11:26:33AM -0800, Richard Elling wrote:
Mathing aorund a bit, for a 300 GB L2ARC (apologies for the tab separation):
size (GB) 300
size (sectors) 585937500
Am 09.02.10 02:30, schrieb Bob Friesenhahn:
On Tue, 9 Feb 2010, Felix Buenemann wrote:
Well to make things short: Using JBOD + ZFS Striped Mirrors vs.
controller's RAID10, dropped the max. sequential read I/O from over
400 MByte/s to below 300 MByte/s. However random I/O and sequential
writes
Hi Daniel,
Am 08.02.10 05:45, schrieb Daniel Carosone:
On Mon, Feb 08, 2010 at 04:58:38AM +0100, Felix Buenemann wrote:
I have some questions about the choice of SSDs to use for ZIL and L2ARC.
I have one answer. The other questions are mostly related to your
raid controller, which I can't
On Mon, 8 Feb 2010, Felix Buenemann wrote:
I was under the impression, that using HW RAID10 would save me 50% PCI
bandwidth and allow the controller to more intelligently handle its cache, so
I sticked with it. But I should run some benchmarks in RAID10 vs. JBOD with
ZFS mirrors to see if
To add to Bob's notes...
On Feb 8, 2010, at 8:37 AM, Bob Friesenhahn wrote:
On Mon, 8 Feb 2010, Felix Buenemann wrote:
I was under the impression, that using HW RAID10 would save me 50% PCI
bandwidth and allow the controller to more intelligently handle its cache,
so I sticked with it.
On Mon, 8 Feb 2010, Richard Elling wrote:
If there is insufficient controller bandwidth capacity, then the
controller becomes the bottleneck.
We don't tend to see this for HDDs, but SSDs can crush a controller and
channel.
It is definitely seen with older PCI hardware.
Bob
--
Bob
Am 08.02.10 22:23, schrieb Bob Friesenhahn:
On Mon, 8 Feb 2010, Richard Elling wrote:
If there is insufficient controller bandwidth capacity, then the
controller becomes the bottleneck.
We don't tend to see this for HDDs, but SSDs can crush a controller and
channel.
It is definitely seen
On Tue, 9 Feb 2010, Felix Buenemann wrote:
Well to make things short: Using JBOD + ZFS Striped Mirrors vs. controller's
RAID10, dropped the max. sequential read I/O from over 400 MByte/s to below
300 MByte/s. However random I/O and sequential writes seemed to perform
Much of the difference
I have some questions about the choice of SSDs to use for ZIL and L2ARC.
I'm trying to build an OpenSolaris iSCSI SAN out of a whitebox system,
which is intended to be used as a backup SAN during storage migration,
so it's built on a tight budget.
The system currently has 4GB RAM, 3GHz
On Mon, Feb 08, 2010 at 04:58:38AM +0100, Felix Buenemann wrote:
I have some questions about the choice of SSDs to use for ZIL and L2ARC.
I have one answer. The other questions are mostly related to your
raid controller, which I can't answer directly.
- Is it safe to run the L2ARC without
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