Hi all,
just an update - but an important one - of the previous benchmark with
2 new "10 DWPD class" contenders :
- Seagate 1200 - ST200FM0053 - SAS 12Gb/s
- Intel DC S3700 - SATA 6Gb/s
The graph :
http://www.4shared.com/download/yaeJgJiFce/Perf-SSDs-Toshiba-Seagate-Inte.png?lgfp=3000
It speaks by itself, the Seagate is clearly a massive improvement over
our best SSD so far (Toshiba M2).
That's a 430MB/s write bandwidth reached with blocks as small as 4KB,
written with SYNC and DIRECT flags.
This was somewhat expected after reading this review
http://www.tweaktown.com/reviews/6075/seagate-1200-stx00fm-12gb-s-sas-enterprise-ssd-review/index.html
An impressive result that should make the Seagate as a SSD of choice
for journal on hosts with SAS controllers
I had also access to an Intel DC S3700, an unavoidable reference as
Ceph journal. Indeed not bad on 4k blocks for the price.
The benchs were made on Dell R730xd with H730P SAS controller (LSI 3108
12GB/s SAS)
Frederic
fred@xxxxxxxxxx <fred@xxxxxxxxxx> a écrit le 31/03/15 14:09 :
Hi,
in our quest to get the right SSD for OSD journals, I managed to
benchmark two kind of "10 DWPD" SSDs :
- Toshiba M2 PX02SMF020
- Samsung 845DC PRO
I wan't to determine if a disk is appropriate considering its absolute
performances, and the optimal number of ceph-osd processes using the
SSD as a journal.
The benchmark consists of a fio command, with SYNC and DIRECT access
options, and 4k blocks write accesses.
fio --filename=/dev/sda --direct=1 --sync=1 --rw=write --bs=4k
--runtime=60 --time_based --group_reporting --name=journal-test
--iodepth=<1 or 16> --numjobs=< ranging from 1 to 16>
I think numjobs can represent the concurrent number of OSD served by
this SSD. Am I right on this ?
http://www.4shared.com/download/WOvooKVXce/Fio-Direct-Sync-ToshibaM2-Sams.png?lgfp=3000
My understanding of that data is that the 845DC Pro cannot be used for
more that 4 OSD.
The M2 is very constant in its comportment.
The iodepth has almost no impact on perfs here.
Could someone having other SSD types make the same test to consolidate
the data ?
Among the short list that could be considered for that task (for their
price/perfs/DWPD/...) :
- Seagate 1200 SSD 200GB, SAS 12Gb/s ST200FM0053
- Hitachi SSD800MM MLC HUSMM8020ASS200
- Intel DC3700
I've not yet considered write amplification mentionned in other posts.
Frederic
Josef Johansson <josef86@xxxxxxxxx> a écrit
le 20/03/15 10:29 :
The 845DC Pro does look really nice, comparable with s3700 with TDW even.
The price is what really does it, as it’s almost a third compared with s3700..
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