On Fri, 2005-04-08 at 15:35, Bob Henkel wrote: > On Apr 8, 2005 3:23 PM, Vivek Khera <vivek@khera.org> wrote: > On Apr 8, 2005, at 3:23 PM, Joel Fradkin wrote: > > > I set up the data on 4 10k scsi drives in a powervault and > my wal on 2 > > 15k > > drives. I am using links to those from the install > directory. It > > starts and > > stops ok this way, but maybe it should be different. > > > > Your problem might just be the choice of using a Dell RAID > controller. > I have a 1 year old box connected to a 14 disk powervault > (PowerEdge > 2650) and it is dog slow compared to a dual opteron with 8 > disks that > is replacing it. It is all I/O for me, and the dell's just > are not > known for speedy I/O. > > Vivek Khera, Ph.D. > +1-301-869-4449 x806 > > > > But that is relative I would think. Is the Dell RAID much faster than > my desktop SATA drive with no RAID? I'm by any means as knowledgeable > about I/O setup as many of you are but my 2 cents wonders if the Dell > RAID is really that much slower than a competitively priced/speced > alternative? Would Joel's problems just fade away if he wasn't using > a Dell RAID?
My experience with the 3i controllers (See my earlier post) was that my old Pentium Pro200x2 machine with 512 meg ram and a generic Ultra Wide SCSI card and a half dozen drives running software RAID 5 was faster.
Seriously. So was my P-II-350 desktop with the same controller, and an older Dual P-III-750 with only UltraSCSI running in a RAID-1 mirror set.
The 3I is REALLY slow (or at least WAS slow) under linux.
Interesting... Maybe Joel after a weekend of rest can try it on a different setup even if that different setup is just a power users development machine to see if he has same or worse timing results. Be wonderful if it magically sped up.
