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
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