On Tue, 22 Jul 1997, David M wrote:
:Dear list members,
:
:I was looking at the documentation my adaptec PCI SCSI and notice a
:couple of configuration parameters that could be changed when running
:under Linux (rather than DOS or Windows). These are:
This sounds similar to an AHA-2940UW, which I have. I have two 4 gig UW
Seagates on it, plus a small Quantum for swap and a 12x CD-ROM.
:
:Plug and Play SCAM support
:--------------------------
:The default setting is disabled. They mention in the manual that if
:enabled than SCSI ID are automatically assigned to those SCSI devices
:that support SCAM. Those that don't usually are not affected (except
:some older SCSI 1 devices which could hang).
:
:Would it be better under Linux to enable this setting???
I disabled it and set the SCSI ids with jumpers. I'm leery of things
like SCSI ids changing - that could change the device name, if you add a
new scsi device and the card detects devices in an unexpected order.
OTOH, it did work with that settign enabled.
:
:
:Extended BIOS Translation for DOS Drives > 1 GByte
:--------------------------------------------------
:The default setting is enabled. The manual under Unixware says that Unix
:supports > 1GByte so the BIOS extentions should be disabled. For SCO
:UNIX it says it ignores this setting so enable or disable work.
:Obciously this is a DOS cludge... ;) and I assume Linux will not require it.
:
:Would it be better under Linux to disable this setting???
I disabled it - with the kludge on, the cylinder size is HUGE. Makes it
harder to fine tune partition size IMHO. Some ppl may not care about
this.
:
:Support for Ultra SCSI Speed
:----------------------------
:The default setting is disabled. The manual says this option determines
:whether the host adapter supports the fast transfer rates (13.4,16,20.0)
:of Ultra SCSI devices.
:
:Should I enable this for Linux? Would the driver support it?
I turned it on. On boot, the disks are synchronous at 20 MHz. They
seem to scream right along.
:
:If you have experience with Adaptec's settings for the Ultra Wide SCSI
:Host Adapter I would like to know how I can fine tune it for Linux. Are
:there any documentation I can read regarding fine tuning this particular
:hardware for Linux? How about the latest drivers?
I used the aic7xxx drivers in the 2.0.30 kernel sources. I've had zero
complaints - the disk subsystem has been rock solid so far <knock on
wood>
There is a mailing list for aic7xxx users, the address is in one of the
READMEs, I forget which one (sorry)
--
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--
:
:Thank you.
:
:Dave
:
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