Hi,

My server has an Intel motherboard with adaptec scsi on it,
and it selects the slowest speed for scsi. This is the first scsi
system I have setup, so i'm not too sure why it's doing this.
Once it did use the 2nd '(scsi1:A:0): 160.000MB/s transfers (80.000MHz
DT|IU|QAS, 16bit)'
and hdparm -tT reported 70mb transfer rate, at the moment
it uses about 2mb. Any idea how to make it select the fastest option?

Here is a posting from dmesg:
--

Partition check:
hda: hda1
SCSI subsystem driver Revision: 1.00
Loading Adaptec I2O RAID: Version 2.4 Build 5
Detecting Adaptec I2O RAID controllers...
Red Hat/Adaptec aacraid driver (1.1.2 Oct 20 2003 16:48:09)
scsi1 : Adaptec AIC79XX PCI-X SCSI HBA DRIVER, Rev 1.3.10
<Adaptec AIC7901A Ultra320 SCSI adapter>
aic7901A: Ultra320 Wide Channel A, SCSI Id=7, PCI-X 67-100Mhz, 512
SCBs

(scsi1:A:0): 320.000MB/s transfers (160.000MHz DT|IU|QAS, 16bit)
(scsi1:A:0): 160.000MB/s transfers (80.000MHz DT|IU|QAS, 16bit)
(scsi1:A:0): 160.000MB/s transfers (80.000MHz DT, 16bit)
(scsi1:A:0): 80.000MB/s transfers (40.000MHz DT, 16bit)
(scsi1:A:0): 80.000MB/s transfers (40.000MHz, 16bit)
(scsi1:A:0): 66.006MB/s transfers (33.003MHz DT, 16bit)
(scsi1:A:0): 66.006MB/s transfers (33.003MHz, 16bit)
(scsi1:A:0): 40.000MB/s transfers (20.000MHz DT, 16bit)
....[cut]...
(scsi1:A:0): 5.681MB/s transfers (5.681MHz)
(scsi1:A:0): 5.555MB/s transfers (5.555MHz)
(scsi1:A:0): 5.434MB/s transfers (5.434MHz)
(scsi1:A:0): 5.319MB/s transfers (5.319MHz)
(scsi1:A:0): 5.208MB/s transfers (5.208MHz)
(scsi1:A:0): 5.102MB/s transfers (5.102MHz)
(scsi1:A:0): 5.000MB/s transfers (5.000MHz)
Vendor: SEAGATE Model: ST336753LW Rev: 0005
Type: Direct-Access ANSI SCSI revision: 03
(scsi1:A:0): 3.300MB/s transfers
scsi1:A:0:0: Tagged Queuing enabled. Depth 32
Attached scsi disk sda at scsi1, channel 0, id 0, lun 0
SCSI device sda: 71687372 512-byte hdwr sectors (36704 MB)
sda: sda1 sda2

In article <i1-dnS2xW_2yiASiU-KYhg@is.co.za>, jekZ wrote:
> system I have setup, so i'm not too sure why it's doing this.
> Once it did use the 2nd '(scsi1:A:0): 160.000MB/s transfers (80.000MHz
> DT|IU|QAS, 16bit)'
> and hdparm -tT reported 70mb transfer rate, at the moment
> it uses about 2mb. Any idea how to make it select the fastest option?
sounds a little like my box. although my Adaptec Scsi card is
seperate. Being its a Macintosh card what I am going to suggest I
can't really do myself. Being its a APA-2930CU I use the Adaptec
2910cfg to at least get it to 10MB/S (Never found how to make it get
back to 20MB/S. Need info to twiddle the actuall seeprom bits
directly.
Go into your cmos and select the speeds you want. Since yours
is built into the board. Most likely you do it when you go to regular
Cmos. You might be able to do it with Control-A when you see your card
probing drives on boot.
Perhaps the question for you is. when did the speed change?
what hardware did you install or remove?

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The New Cnews maintainer
B'ichela

B'ichela <mdalene@pinkrose.net.dhis.org> wrote in message news:<HnA1C2.2HH@pinkrose.local.net>...
> In article <i1-dnS2xW_2yiASiU-KYhg@is.co.za>, jekZ wrote:
> > system I have setup, so i'm not too sure why it's doing this.
> > Once it did use the 2nd '(scsi1:A:0): 160.000MB/s transfers (80.000MHz
> > DT|IU|QAS, 16bit)'
> > and hdparm -tT reported 70mb transfer rate, at the moment
> > it uses about 2mb. Any idea how to make it select the fastest option?
> sounds a little like my box. although my Adaptec Scsi card is
> seperate. Being its a Macintosh card what I am going to suggest I
> can't really do myself. Being its a APA-2930CU I use the Adaptec
> 2910cfg to at least get it to 10MB/S (Never found how to make it get
> back to 20MB/S. Need info to twiddle the actuall seeprom bits
> directly.
> Go into your cmos and select the speeds you want. Since yours
> is built into the board. Most likely you do it when you go to regular
> Cmos. You might be able to do it with Control-A when you see your card
> probing drives on boot.
> Perhaps the question for you is. when did the speed change?
> what hardware did you install or remove?


I run an Adaptec 2940UW on a K6-III 400. I think it is {<ctrl>a} to
access the scsi card during bootup. Addresses 0-8 are 40MByte and
9-15 is up to 20Mbyte.
You did not mention what speed your devices support. the speeds for
the 50 pin SCSI are, if I remember correctly, 5MB, 10MB and 20MB. The
only experience I have with onboard SCSI is the Amiga 3000. SCSI is
faster than IDE/ATA for a couple of reasons. One is that the SCSI
controller handles all I/O on the SCSI bus, and The SCSI controller
can multitask I/O. Do Not forget that UW SCSI prefers active
termination.

Walt R.