What is the link speed of the SAS drives as reported by the controller?
j. -----Original Message----- From: Hong Wei Liam [mailto:weiliam.h...@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.h...@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@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@openindiana.org >> http://openindiana.org/mailman/listinfo/openindiana-discuss >> > _______________________________________________ > OpenIndiana-discuss mailing list > OpenIndiana-discuss@openindiana.org > http://openindiana.org/mailman/listinfo/openindiana-discuss _______________________________________________ OpenIndiana-discuss mailing list OpenIndiana-discuss@openindiana.org http://openindiana.org/mailman/listinfo/openindiana-discuss
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