Levesque aleves...@gtcomm.net
À: Christian Balzer ch...@gol.com
Cc: ceph-users ceph-users@lists.ceph.com
Envoyé: Vendredi 24 Avril 2015 22:00:44
Objet: Re: [ceph-users] Possible improvements for a slow write
speed (excluding independent SSD journals)
Hi Christian,
We tested some DC
Levesque aleves...@gtcomm.net
À: Christian Balzer ch...@gol.com
Cc: ceph-users ceph-users@lists.ceph.com
Envoyé: Vendredi 24 Avril 2015 22:00:44
Objet: Re: [ceph-users] Possible improvements for a slow write
speed(excluding independent SSD journals)
Hi Christian,
We tested
.
- Mail original -
De: Anthony Levesque aleves...@gtcomm.net
À: Christian Balzer ch...@gol.com
Cc: ceph-users ceph-users@lists.ceph.com
Envoyé: Vendredi 24 Avril 2015 22:00:44
Objet: Re: [ceph-users] Possible improvements for a slow write
speed(excluding independent SSD journals
: Anthony Levesque aleves...@gtcomm.net
À: Christian Balzer ch...@gol.com
Cc: ceph-users ceph-users@lists.ceph.com
Envoyé: Vendredi 24 Avril 2015 22:00:44
Objet: Re: [ceph-users] Possible improvements for a slow write
speed (excluding independent SSD journals)
Hi Christian,
We
-users ceph-users@lists.ceph.com
Sent: Saturday, 25 April, 2015 5:32:30 PM
Subject: Re: [ceph-users] Possible improvements for a slow write
speed (excluding independent SSD journals)
I'm able to reach around 2-25000iops with 4k block with s3500
(with o_dsync) (so yes, around 80-100MB/S).
I'l
Objet: Re: [ceph-users] Possible improvements for a slow write
speed (excluding independent SSD journals)
Hi Christian,
We tested some DC S3500 300GB using dd if=randfile of=/dev/sda bs=4k
count=10 oflag=direct,dsync
we got 96 MB/s which is far from the 315 MB/s from the website
Envoyé: Vendredi 24 Avril 2015 22:00:44
Objet: Re: [ceph-users] Possible improvements for a slow write speed
(excluding independent SSD journals)
Hi Christian,
We tested some DC S3500 300GB using dd if=randfile of=/dev/sda bs=4k
count=10 oflag=direct,dsync
we got 96 MB/s which is far from
Hi Christian,
We tested some DC S3500 300GB using dd if=randfile of=/dev/sda bs=4k
count=10 oflag=direct,dsync
we got 96 MB/s which is far from the 315 MB/s from the website.
Can I ask you or anyone on the mailing list how you are testing the write speed
for journals?
Thanks
---
Anthony
To update you on the current test in our lab:
1.We tested the Samsung OSD in Recovery mode and the speed was able to maxout
2x 10GbE port(transferring data at 2200+ MB/s during recovery). So for normal
write operation without O_DSYNC writes Samsung drives seem ok.
2.We then tested a couple of
Hello,
On Thu, 23 Apr 2015 18:40:38 -0400 Anthony Levesque wrote:
To update you on the current test in our lab:
1.We tested the Samsung OSD in Recovery mode and the speed was able to
maxout 2x 10GbE port(transferring data at 2200+ MB/s during recovery).
So for normal write operation
Hi,
I'm just writing to you to stress out what others have already said,
because it is very important that you take it very seriously.
On 20/04/15 19:17, J-P Methot wrote:
On 4/20/2015 11:01 AM, Christian Balzer wrote:
This is similar to another thread running right now, but since our
*From: *Eneko Lacunza elacu...@binovo.es
*To: *J-P Methot jpmet...@gtcomm.net, Christian Balzer
ch...@gol.com, ceph-users@lists.ceph.com
*Sent: *Tuesday, 21 April, 2015 8:18:20 AM
*Subject: *Re: [ceph-users] Possible improvements for a slow write
speed (excluding independent
*From: *Eneko Lacunza elacu...@binovo.es
*To: *J-P Methot jpmet...@gtcomm.net, Christian Balzer
ch...@gol.com, ceph-users@lists.ceph.com
*Sent: *Tuesday, 21 April, 2015 8:18:20 AM
*Subject: *Re: [ceph-users] Possible improvements for a slow write
speed (excluding
: Tuesday, 21 April, 2015 8:18:20 AM
Subject: Re: [ceph-users] Possible improvements for a slow write
speed (excluding independent SSD journals)
Hi,
I'm just writing to you to stress out what others have already said,
because it is very important that you take it very seriously.
On 20/04/15 19:17
*From: *Eneko Lacunza elacu...@binovo.es
*To: *J-P Methot jpmet...@gtcomm.net, Christian Balzer
ch...@gol.com, ceph-users@lists.ceph.com
*Sent: *Tuesday, 21 April, 2015 8:18:20 AM
*Subject: *Re: [ceph-users] Possible improvements for a slow write
On Mon, 20 Apr 2015 13:17:18 -0400 J-P Methot wrote:
On 4/20/2015 11:01 AM, Christian Balzer wrote:
Hello,
On Mon, 20 Apr 2015 10:30:41 -0400 J-P Methot wrote:
Hi,
This is similar to another thread running right now, but since our
current setup is completely different from the
Are your journals on separate disks? What is your ratio of journal disks to
data disks? Are you doing replication size 3 ?
On Mon, Apr 20, 2015 at 9:30 AM, J-P Methot jpmet...@gtcomm.net wrote:
Hi,
This is similar to another thread running right now, but since our current
setup is completely
My journals are on-disk, each disk being a SSD. The reason I didn't go
with dedicated drives for journals is that when designing the setup, I
was told that having dedicated journal SSDs on a full-SSD setup would
not give me performance increases.
So that makes the journal disk to data disk
The big question is how fast these drives can do O_DSYNC writes. The
basic gist of this is that for every write to the journal, an
ATA_CMD_FLUSH call is made to ensure that the device (or potentially the
controller) know that this data really needs to be stored safely before
the flush is
Hi,
This is similar to another thread running right now, but since our
current setup is completely different from the one described in the
other thread, I thought it may be better to start a new one.
We are running Ceph Firefly 0.80.8 (soon to be upgraded to 0.80.9). We
have 6 OSD hosts
original -
De: J-P Methot jpmet...@gtcomm.net
À: ceph-users ceph-users@lists.ceph.com
Envoyé: Lundi 20 Avril 2015 16:30:41
Objet: [ceph-users] Possible improvements for a slow write speed (excluding
independent SSD journals)
Hi,
This is similar to another thread running right now, but since our
Hello,
On Mon, 20 Apr 2015 10:30:41 -0400 J-P Methot wrote:
Hi,
This is similar to another thread running right now, but since our
current setup is completely different from the one described in the
other thread, I thought it may be better to start a new one.
We are running Ceph
Using rados benchmark. It's just a test pool anyway. I will stick with my
current OSD setup (16HDDs 4 SSDs for a 1:4 ration of SSD to HDD). I can get
800 MB/s write and about 1GB read.
On Mon, Apr 20, 2015 at 11:19 AM, Mark Nelson mnel...@redhat.com wrote:
How are you measuring the 300MB/s and
I have a SSD pool for testing (only 8 Drives) but when I do a 1 SSD with
journal and 1 SSD with Data I get 300 MB/s write. When I change all 8
Disks to house the journal I get 184MB/s write.
On Mon, Apr 20, 2015 at 10:16 AM, Mark Nelson mnel...@redhat.com wrote:
The big question is how fast
How are you measuring the 300MB/s and 184MB/s? IE is it per drive, or
the client throughput? Also what controller do you have? We've seen
some controllers from certain manufacturers start to top out at around
1-2GB/s with write cache enabled.
Mark
On 04/20/2015 11:15 AM, Barclay Jameson
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