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I am running 3.6-STABLE with GENERIC kernel and have the following:

P4-3.06 with 1GB ram
ServerWorks IDE chipset
(2) Adaptec 29160LP U160 cards
(2) Seagate Cheetah U160 10K 36GB drives
(2) Seagate Baracudda 7200 UDMA-5 40GB drives

There is ONE drive PER controller in all cases.

When I run dump between IDE drives (each on own controller) I see well over
18MB/sec in transfers...and the time indicated matches.

When I run dump between SCSI drives (each on own controller) I see only
5.9MB/sec in transfers...and the time indicated matches.

I then tried both SCSI drives on the same controller. No difference.

So then I made a custom kernel and added the following:

option AHC_ALLOW_MEMIO
option AHC_TAGENABLE
option AHC_SCBPAGING_ENABLE


...this was accepted but made NO improvement at all.

So far the only thing I have seen any benefit with SCSI is speedy untaring
of files or rm'ing of directories and I would attribute that to the 10K speed.

I am *not* complaining here, but looking for any ideas or answers.

I am trying to decide which way to go (IDE or SCSI) and any comments here
WILL be appreciated.

Drive to Drive transfers across controllers should rock. Using this SAME
gear under Solaris9, I would typically see 25-30MB/sec of transfers using
dump on SCSI.

Thanks guys for any comments good or bad.








--
J.D. Bronson
Aurora Health Care // Information Services // Milwaukee, WI USA
Office: 414.978.8282 // Email: jd@aurora.org // Pager: 414.314.8282
Reach me at AIM:lonebanditusa //