On Thu, Jan 05, 2006 at 04:20:32PM +0100, Pailloncy Jean-Gerard wrote: > Hi, > > I have a MegaRaid i4 card on an OpenBSD 3.8 box. > The speed of the card is very slow. > max: read < 15 M/s, write < 5 M/s > average: read 8 M/s, write 2.5 M/s
It is a very very old card (1995ish) and on top of that there is a unfortunately a firmware issue that prevents us from running more than 1 command at a time. You should get a PERC 3 or 4 instead. > > I have an other identical drive on the internal IDE bus, and it is at > least three times faster. > > Any idea ? Yes, ide vs scsi benchmarks are usually skewed due to caching. SCSI disables drive cache by default whereas IDE enables it by default. > > The card is on "Mass Storage" Mode. > I never change it, nor test the IOP mode. > Is it worth to try ? The man page recommends the use of the "Mass > Storage" mode. > > Is is safe to switch from one mode to an other ? Will the data be > preserved ? It is safe to switch however only mass-storage works on OpenBSD. > > Jean-Girard Pailloncy
