[OpenIndiana-discuss] Poor relative performance of SAS overSATA drives
Hong Wei Liam
weiliam.hong at gmail.com
Thu Oct 27 00:10:38 UTC 2011
I tried checking with the configuration utility (via Control-C while booting), could not find any way ..
I have tried different disk backplanes on Supermicro 745TQ, 836A and 846E2 all with same results.
Regards,
WL
On Oct 27, 2011, at 8:03 AM, Jason Matthews wrote:
>
>
> What is the link speed of the SAS drives as reported by the controller?
>
> j.
>
> -----Original Message-----
> From: Hong Wei Liam [mailto:weiliam.hong at gmail.com]
> Sent: Wednesday, October 26, 2011 4:59 PM
> To: Discussion list for OpenIndiana
> Subject: Re: [OpenIndiana-discuss] Poor relative performance of SAS overSATA
> drives
>
> I had initially tried only having the SAS drives installed with the same
> results.
>
> Later, the SATA drives were added in for comparison.
>
> Regards,
> WL
>
>
> On Oct 27, 2011, at 2:27 AM, Jason J. W. Williams wrote:
>
>> Is the card hosting any SATA and SAS drives on the same port, or are
>> they segregated SAS on one and SATA on the other?
>>
>> -J
>>
>> On Wed, Oct 26, 2011 at 9:01 AM, weiliam.hong <weiliam.hong at gmail.com>
> wrote:
>>> Greetings,
>>>
>>> I have a fresh installation of OI151a:
>>> - SM X8DTH, 12GB RAM, LSI 9211-8i (latest IT-mode firmware)
>>> - pool_A : SG ES.2 Constellation (SAS)
>>> - pool_B : WD RE4 (SATA)
>>> - no settings in /etc/system
>>>
>>>
>>> *zpool status output*
>>> -------------------
>>> admin at openindiana:~# zpool status
>>> pool: pool_A
>>> state: ONLINE
>>> scan: none requested
>>> config:
>>>
>>> NAME STATE READ WRITE CKSUM
>>> pool_A ONLINE 0 0 0
>>> mirror-0 ONLINE 0 0 0
>>> c7t5000C50035062EC1d0 ONLINE 0 0 0
>>> c8t5000C50034C03759d0 ONLINE 0 0 0
>>>
>>> pool: pool_B
>>> state: ONLINE
>>> scan: none requested
>>> config:
>>>
>>> NAME STATE READ WRITE CKSUM
>>> pool_B ONLINE 0 0 0
>>> mirror-0 ONLINE 0 0 0
>>> c1t50014EE057FCD628d0 ONLINE 0 0 0
>>> c2t50014EE6ABB89957d0 ONLINE 0 0 0
>>>
>>>
>>> *Load generation via 2 concurrent dd streams:*
>>> --------------------------------------------------
>>> dd if=/dev/zero of=/pool_A/bigfile bs=1024k count=1000000
>>> dd if=/dev/zero of=/pool_B/bigfile bs=1024k count=1000000
>>>
>>>
>>> *Initial Observation*
>>> -------------------
>>>
>>> capacity operations bandwidth
>>> pool alloc free read write read write
>>> ---------- ----- ----- ----- ----- ----- -----
>>> pool_A 1.68G 2.72T 0 652 0 73.4M
>>> mirror 1.68G 2.72T 0 652 0 73.4M
>>> c7t5000C50035062EC1d0 - - 0 619 0 73.4M
>>> c8t5000C50034C03759d0 - - 0 619 0 73.4M
>>> ---------- ----- ----- ----- ----- ----- -----
>>> pool_B 1.54G 1.81T 0 1.05K 0 123M
>>> mirror 1.54G 1.81T 0 1.05K 0 123M
>>> c1t50014EE057FCD628d0 - - 0 1.02K 0 123M
>>> c2t50014EE6ABB89957d0 - - 0 1.01K 0 123M
>>>
>>> *
>>> 10-15mins later*
>>> ------------=--
>>>
>>> capacity operations bandwidth
>>> pool alloc free read write read write
>>> ---------- ----- ----- ----- ----- ----- -----
>>> pool_A 15.5G 2.70T 0 50 0 6.29M
>>> mirror 15.5G 2.70T 0 50 0 6.29M
>>> c7t5000C50035062EC1d0 - - 0 62 0 7.76M
>>> c8t5000C50034C03759d0 - - 0 50 0 6.29M
>>> ---------- ----- ----- ----- ----- ----- -----
>>> pool_B 28.0G 1.79T 0 1.07K 0 123M
>>> mirror 28.0G 1.79T 0 1.07K 0 123M
>>> c1t50014EE057FCD628d0 - - 0 1.02K 0 123M
>>> c2t50014EE6ABB89957d0 - - 0 1.02K 0 123M
>>>
>>>
>>>
>>> Questions:
>>> 1. Why does SG SAS drives degrade to <10 MB/s while WD RE4 remain
> consistent
>>> at >100MB/s after 10-15 min?
>>> 2. Why does SG SAS drive show only 70+ MB/s where is the published
> figures
>>> are > 100MB/s refer here
>>>
> <http://www.seagate.com/www/en-us/products/enterprise-hard-drives/constellat
> ion-es/constellation-es-2/#tTabContentSpecifications>?
>>> 3. All 4 drives are connected to a single HBA, so I assume the mpt_sas
>>> driver is used. Are SAS and SATA drives handled differently ?
>>>
>>>
>>> This is a test server, so any ideas to try and help me understand greatly
>>> appreciated.
>>>
>>>
>>> Many thanks,
>>> WL
>>>
>>>
>>>
>>>
>>> _______________________________________________
>>> OpenIndiana-discuss mailing list
>>> OpenIndiana-discuss at openindiana.org
>>> http://openindiana.org/mailman/listinfo/openindiana-discuss
>>>
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