On Oct 26, 2011, at 7:56 PM, weiliam.hong wrote: > > 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?
Are the SAS drives multipathed? If so, do you have round-robin (default in most Solaris distros) or logical-block? > 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 ? Yes. SAS disks can be multipathed, SATA disks cannot. -- richard -- ZFS and performance consulting http://www.RichardElling.com LISA '11, Boston, MA, December 4-9 _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
