On Tue, 10 Nov 2009, Tim Cook wrote:
My personal thought would be that it doesn't really make sense to
even have it, at least for readzilla. In theory, you always want
the SSD to be full, or nearly full, as it's a cache. The whole
point of TRIM, from my understanding, is to speed up the
On Wed, Nov 11, 2009 at 11:51 AM, Bob Friesenhahn
bfrie...@simple.dallas.tx.us wrote:
On Tue, 10 Nov 2009, Tim Cook wrote:
My personal thought would be that it doesn't really make sense to even
have it, at least for readzilla. In theory, you always want the SSD to be
full, or nearly full,
On Mon, Sep 07, 2009 at 09:58:19AM -0700, Richard Elling wrote:
I only know of hole punching in the context of networking. ZFS doesn't
do networking, so the pedantic answer is no.
But a VDEV may be an iSCSI device, thus there can be networking below
ZFS.
For some iSCSI targets (including
On Wed, 11 Nov 2009, Tim Cook wrote:
I'm well aware of the fact that SSD mfg's put extra blocks into the
device to increase both performance and MTBF. I'm not sure how that
invalidates what I've said though, or even plays a roll, and you
haven't done a very good job of explaining why you
I've been following the use of SSD with ZFS and HSPs for some time now, and I
am working (in an architectural capacity) with one of our IT guys to set up our
own ZFS HSP (using a J4200 connected to an X2270).
The best practice seems to be to use an Intel X25-M for the L2ARC (Readzilla)
and an
On Tue, Nov 10, 2009 at 6:51 PM, George Janczuk
geor...@objectconsulting.com.au wrote:
I've been following the use of SSD with ZFS and HSPs for some time now, and
I am working (in an architectural capacity) with one of our IT guys to set
up our own ZFS HSP (using a J4200 connected to an
2009/9/7 Ritesh Raj Sarraf r...@researchut.com:
The Discard/Trim command is also available as part of the SCSI standard now.
Now, if you look from a SAN perspective, you will need a little of both.
Filesystems will need to be able to deallocate blocks and then the same
should be triggered as
Folks:
I gave a presentation last weekend on how one could use Zones, ZFS and
Crossbow to recreate deployments scenarios on one's computer (to the
extent possible).
I've received the following question, and would like to ask the ZFS
Community for answers.
-- Sriram
-- Forwarded
On Sep 7, 2009, at 3:49 AM, Sriram Narayanan wrote:
Folks:
I gave a presentation last weekend on how one could use Zones, ZFS and
Crossbow to recreate deployments scenarios on one's computer (to the
extent possible).
I've received the following question, and would like to ask the ZFS
Community
On Mon, 7 Sep 2009, Richard Elling wrote:
This is an article about the new TRIM command. It would be important for
file systems which write their metadata to the same physical location or use
a MRU replacement algorithm. But ZFS is copy-on-write, so the metadata is
allocated from free space and
On Sep 7, 2009, at 10:20 AM, Bob Friesenhahn wrote:
On Mon, 7 Sep 2009, Richard Elling wrote:
This is an article about the new TRIM command. It would be
important for
file systems which write their metadata to the same physical
location or use
a MRU replacement algorithm. But ZFS is
On Mon, 7 Sep 2009, Richard Elling wrote:
Yep, it is there to try and solve the problem of rewrites in a small area,
smaller than the bulk erase size. While it would be trivial to traverse the
spacemap and TRIM the free blocks, it might not improve performance
for COW file systems. My crystal
On Sep 7, 2009, at 11:48 AM, Bob Friesenhahn wrote:
On Mon, 7 Sep 2009, Richard Elling wrote:
Yep, it is there to try and solve the problem of rewrites in a
small area,
smaller than the bulk erase size. While it would be trivial to
traverse the
spacemap and TRIM the free blocks, it might
2009/9/7 Richard Elling richard.ell...@gmail.com:
On Sep 7, 2009, at 10:20 AM, Bob Friesenhahn wrote:
The purpose of the TRIM command is to allow the FLASH device to reclaim
and erase storage at its leisure so that the writer does not need to wait
for erasure once the device becomes full.
The Discard/Trim command is also available as part of the SCSI standard now.
Now, if you look from a SAN perspective, you will need a little of both.
Filesystems will need to be able to deallocate blocks and then the same should
be triggered as a SCSI Trim to the Storage Controller.
For a
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