Dual scsi adaptors and setup

Dual scsi adaptors and setup

Post by Marc MERL » Sat, 04 Jul 1998 04:00:00




>Dear all

>I wonder if you can help.

>Iam trying to install Redhat Linux 5.1.  The problem I have is that in the
>machine there are two scsi adaptors:

>i)Adaptec AHA1542 CP PnP ISA
>ii) Adaptec AHA2940 W/UW

>The problem I have is that I can get Linux to detect one or the other but not
>both.

You may have to force the detection of one or the two boards.
Try giving options to lilo (the following two are excerpts from the source
code):

aha1542.c:
/*
 * LILO params:  aha1542=<PORTBASE>[,<BUSON>,<BUSOFF>[,<DMASPEED>]]
 *
 * Where:  <PORTBASE> is any of the valid AHA addresses:
 *                      0x130, 0x134, 0x230, 0x234, 0x330, 0x334
 *         <BUSON>  is the time (in microsecs) that AHA spends on the AT-bus
 *                  when transferring data.  1542A power-on default is 11us,
 *                  valid values are in range: 2..15 (decimal)
 *         <BUSOFF> is the time that AHA spends OFF THE BUS after while
 *                  it is transferring data (not to monopolize the bus).
 *                  Power-on default is 4us, valid range: 1..64 microseconds.
 *         <DMASPEED> Default is jumper selected (1542A: on the J1),
 *                  but experimenter can alter it with this.
 *                  Valid values: 5, 6, 7, 8, 10 (MB/s)
 *                  Factory default is 5 MB/s.
 */  

aic7xxx.c:
 *  A Boot time option was also added for not resetting the scsi bus.
 *
 *    Form:  aic7xxx=extended
 *           aic7xxx=no_reset
 *           aic7xxx=ultra
 *           aic7xxx=irq_trigger:[0,1]  # 0 edge, 1 level
 *           aic7xxx=verbose  

I bet just giving aha1542=0x330 (or whatever port you use) should solve the
problem

Quote:>Adaptor i) has the cd rom attached and adaptor ii) has the hard drive
>attached.

As someone else said, with a simple setup like that, you may be better off
putting everything on one chain (I do have two SCSI chains a home, but
that's because I have more than 10 devices, from slow narrow SCSI 5 to ultra
fast wide SCSI 40 :-D).

Marc
--
Home page: http://magic.metawire.com/~merlin/ (browser friendly)

 
 
 

1. Connecting PCI Dual Channel Ultra3 SCSI Adapter to non IBM RAID - Performance Problem!

Hi!

I'm connecting a Infortrend SCSI Raid (supporting LVD, Ultra SCSI3, etc
and performing well under Linux) to a F50 with an Dual Channel Ultra3
SCSI Adapter (which should archive up to 160 MB/sec).

Reading 100MB of the same 64k block from the raid (it has 256 MB of
cache) showes me the SCSI Performance of the bus.

It takes about 4 seconds reading from /dev/rhdiskX, which is 25MB/sec.

Looking at the raid it tells me, that AIX is talking async narrow to the
raid!

Does anybody have experiance connecting a non IBM RAID on Ultra SCSI3 to
an AIX machine?

I would expect transfer rates at least of 60 MB reading from cache.

Perhaps there is a need for ODM config changes to tell AIX that osdisk
is a LVD disk?

Thanks in advance,

Andreas

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