On Mon, 2006-03-13 at 08:39 -0700, Richard Fish wrote: > On 3/13/06, Ow Mun Heng <[EMAIL PROTECTED]> wrote: > > I recently got a bunch of (old) scsi disks and would like to get the > > most out of them. They are 7200 18GB scsi disks which hdparm reports up > > to 18MB/s of transfer rate. (vs 30MB/s on my 5400 80GB laptop drive and > > 24MB/s on a 7200 200GB IDE Drive) > > > > I'm wondering if there are applications which can be used to tune the > > disks for better performance? > > I don't think there is much tuning that can be done, other than > putting them in a RAID0 array.
Wouldn't Raid5 be a better choice? Although there is the added Parity which does give some fault tolerance. Actually, since you brought it up, I've got 4 drives, 1 I'm using for the OS. The other 3, I'm undecided. It's either. 3x18GB = 54GB in a LVM2 array (/storage) (JBOD I guess) or 3x18GB Raid 0 = 54GB but lose _all_ data if any disk fails. Not an option I suppose. > SCSI already does DMA, so as long as > they are attached to the fastest controller that the drives support, > you are probably maxed out on throughput. Sigh.. That's still low comparatively compared to the newer generation of drives (esp SATA which give up to 80-100MB/s transfers) > > BTW, 24MB/s on a 7200rpm 200G drive on an IDE channel seems very, very > low. It is isn't it? Then again, it's also attached to a Pentium II system. (I was comparing apples to apples) Pentium II 300Mhz w/ SCSI disks - 18MB/s (18GB Scsi 7200rpm) Pentium II 300Mhz w/ IDE disks - 24MB/s (200GB IDE 7200rpm) > That number should be more like 65MB/s. Unless this is actually > in a USB enclosure... Nope. -- Ow Mun Heng Gentoo/Linux on DELL D600 1.4Ghz 1.5GB RAM 98% Microsoft(tm) Free!! Neuromancer 11:13:22 up 2 days, 13:16, 4 users, load average: 0.98, 0.70, 0.36 -- gentoo-user@gentoo.org mailing list
