Hi Mark,
On 18.12.2014 07:15, Mark Kirkwood wrote:
While you can't do much about the endurance lifetime being a bit low,
you could possibly improve performance using a journal *file* that is
located on the 840's (you'll need to symlink it - disclaimer - have
not tried this myself, but will
The effect of this is *highly* dependent to the SSD make/model. My m550
work vastly better if the journal is a file on a filesystem as opposed
to a partition.
Obviously the Intel S3700/S3500 are a better choice - but the OP has
already purchased Sammy 840's, so I'm trying to suggest options
On Thu, 18 Dec 2014 10:05:20 PM Mark Kirkwood wrote:
My m550
work vastly better if the journal is a file on a filesystem as opposed
to a partition.
Any particular filesystem? ext4? xfs? or doesn't matter?
--
Lindsay
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On Thu, 18 Dec 2014 10:05:20 PM Mark Kirkwood wrote:
The effect of this is *highly* dependent to the SSD make/model. My m550
work vastly better if the journal is a file on a filesystem as opposed
to a partition.
Obviously the Intel S3700/S3500 are a better choice - but the OP has
already
On 19/12/14 03:01, Lindsay Mathieson wrote:
On Thu, 18 Dec 2014 10:05:20 PM Mark Kirkwood wrote:
The effect of this is *highly* dependent to the SSD make/model. My m550
work vastly better if the journal is a file on a filesystem as opposed
to a partition.
Obviously the Intel S3700/S3500 are a
Hey there,
Is there a good work around if our SSDs are not handling D_SYNC very well? We
invested a ton of money into Samsung 840 EVOS and they are not playing well
with D_SYNC. Would really appreciate the help!
Thank you,
Bryson
___
ceph-users
Hello,
On Tue, 16 Dec 2014 08:58:23 -0700 Bryson McCutcheon wrote:
Hey there,
Is there a good work around if our SSDs are not handling D_SYNC very
well? We invested a ton of money into Samsung 840 EVOS and they are not
playing well with D_SYNC. Would really appreciate the help!
Baring
On 12/17/2014 02:58 AM, Bryson McCutcheon wrote:
Is there a good work around if our SSDs are not handling D_SYNC very
well? We invested a ton of money into Samsung 840 EVOS and they are
not playing well with D_SYNC. Would really appreciate the help!
Just in case it's linked with the recent
Hi Mikaël,
I have EVOs too, what to you mean by not playing well with D_SYNC?
Is there something I can test on my side to compare results with you,
as I have mine flashed?
http://www.sebastien-han.fr/blog/2014/10/10/ceph-how-to-test-if-your-ssd-is-suitable-as-a-journal-device/
described how
-users
ceph-users@lists.ceph.com
Envoyé: Jeudi 18 Décembre 2014 03:16:07
Objet: Re: [ceph-users] Help with SSDs
On 12/17/2014 02:58 AM, Bryson McCutcheon wrote:
Is there a good work around if our SSDs are not handling D_SYNC very
well? We invested a ton of money into Samsung 840 EVOS
Looking at the blog, I notice he disabled the write cache before the
tests: doing this on my m550 resulted in *improved* dsync results (300
IOPS - 700 IOPS) still not great obviously, but ... interesting.
So do experiment with the settings to see if you can get the 840's
working better for
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