On Thu, Sep 28, 2006 at 05:15:05PM -0500, Albert Chin wrote: > I don't understand how #1 gives 16MB/s (RAID 1) while #3 gives only > 17MB/s. I'd expect #3 to be about x2 the performance of #1. > > The arrays are configured with "write-thru" write policy, "adaptive" > read policy, and "cachedio" cache policy. > > Anything I can do to improve the speed. Even though the bus is 33Mhz, > I should definitely be doing better than 16MB/s. > > {snip} > > I'm running bonnie++ as: > $ cd [some tmp dir on UFS2 file system] > $ bonnie++
Pure shot in the dark (I have no experience with LSI controllers, only Adaptec and Promise): have you tried adjusting some of the tunefs parameters for the UFS2 filesystem bonnie++ is using? Options -e and -f may help with this. Also, at least in the Adaptec world: if the controller does its own caching (that is, it has actual RAM on-board or DRAM of some kind), it is sometimes *better* to disable SCSI disk caching on each individual SCSI drive and let the controller do it. Again, can't speak for LSI controllers... -- | Jeremy Chadwick jdc at parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB | _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "[EMAIL PROTECTED]"