I posted a bunch of the more recent numbers in the specs. Had some down time and had a bunch of SSD's lying around and just curious if any were hidden gems... Interestingly, the Intel drives seem to not require the write cache off, while other drives had to be "forced" off using the hdparm -W0 /dev/sdx to make sure it was off.
The machine we tested on is a Dell C2100 Dual x5560, 96GB ram, LSI2008 IT mode controller
intel Dc S3700 200GB
Model Number: INTEL SSDSC2BA200G3L
Firmware Revision: 5DV10265
1 - io=4131.2MB, bw=70504KB/s, iops=17626, runt= 60001msec
5 - io=9529.1MB, bw=162627KB/s, iops=40656, runt= 60001msec
10 - io=7130.5MB, bw=121684KB/s, iops=30421, runt= 60004msec
Samsung SM863
Model Number: SAMSUNG MZ7KM240HAGR-0E005
Firmware Revision: GXM1003Q
1 - io=2753.1MB, bw=47001KB/s, iops=11750, runt= 60000msec
5 - io=6248.8MB, bw=106643KB/s, iops=26660, runt= 60001msec
10 - io=8084.1MB, bw=137981KB/s, iops=34495, runt= 60001msec
We decided to go with Intel model. The Samsung was impressive on the higher end with multiple threads, but figured for most of our nodes with 4-6 OSD's the intel were a bit more proven and had better "light-medium" load numbers.
Carlos M. Perez
CMP Consulting Services
305-669-1515
-----Original Message-----
From: ceph-users [mailto:ceph-users-bounces@xxxxxxxxxxxxxx] On Behalf Of Dan van der Ster
Sent: Tuesday, July 5, 2016 4:23 AM
To: Christian Balzer <chibi@xxxxxxx>
Cc: ceph-users <ceph-users@xxxxxxxxxxxxxx>
Subject: Re: Quick short survey which SSDs
On Tue, Jul 5, 2016 at 10:04 AM, Dan van der Ster <dan@xxxxxxxxxxxxxx> wrote:
> On Tue, Jul 5, 2016 at 9:53 AM, Christian Balzer <chibi@xxxxxxx> wrote:
>>> Unfamiliar: Samsung SM863
>>>
>> You might want to read the thread here:
>> http://lists.ceph.com/pipermail/ceph-users-ceph.com/2016-February/007
>> 871.html
>>
>> And google "ceph SM863".
>>
>> However I'm still waiting for somebody to confirm that these perform
>> (as one would expect from DC level SSDs) at full speed with sync
>> writes, which is the only important factor for journals.
>
> Tell me the fio options you're interested in and I'll run it right now.
Using the options from Sebastien's blog I get:
1 job: write: io=5863.3MB, bw=100065KB/s, iops=25016, runt= 60001msec
5 jobs: write: io=11967MB, bw=204230KB/s, iops=51057, runt= 60001msec
10 jobs: write: io=13760MB, bw=234829KB/s, iops=58707, runt= 60001msec
Drive is model MZ7KM240 with firmware GXM1003Q.
--
Dan
[1] fio --filename=/dev/sdc --direct=1 --sync=1 --rw=write --bs=4k
--numjobs=1 --iodepth=1 --runtime=60 --time_based --group_reporting --name=journal-test _______________________________________________
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