Re: Slow writes to SAS drives on LSI mpt2sas HBA

Hello Ewan On Dec 3, 2012, at 5:06 PM, Ewan Milne wrote: >> > > It sounds like your drive write cache is disabled, 7200RPM is 120 > revolutions/sec, and you are getting 7747584 / 1024 / 63.59 = ~119 IO/s > I believe the write cache is enabled by default on SATA drives, which > would explain th

Slow writes to SAS drives on LSI mpt2sas HBA

Hello, I am experiencing a significant performance issue in write thoughput with SAS devices connected via an LSI 9207-8e (LSISAS2308 based) HBA. SATA devices plugged into the same rig appear to be ok. I first noticed this in kernel v3.0.13, but I confirmed the problem exists even in 3.7.0-r