Re: [gentoo-user] Tuning SCSI disks-App like hdparm available?
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
[gentoo-user] Tuning SCSI disks-App like hdparm available?
Hi All, 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? The disks are attached to a Pentium II system. -- Ow Mun Heng Gentoo/Linux on DELL D600 1.4Ghz 1.5GB RAM 98% Microsoft(tm) Free!! Neuromancer 18:24:33 up 20:26, 6 users, load average: 0.16, 0.25, 0.33 -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] Tuning SCSI disks-App like hdparm available?
On Mon, Mar 13, 2006 at 06:24:38PM +0800, Ow Mun Heng wrote: I'm wondering if there are applications which can be used to tune the disks for better performance? There is a hdparm for SCSI, sdparm. Never tried it though. Cheers, Rasmus -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] Tuning SCSI disks-App like hdparm available?
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. 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. BTW, 24MB/s on a 7200rpm 200G drive on an IDE channel seems very, very low. That number should be more like 65MB/s. Unless this is actually in a USB enclosure... -Richard -- gentoo-user@gentoo.org mailing list