Messages in this thread | | | Date | Thu, 6 Jun 2002 13:44:19 -0700 | From | Patrick Mansfield <> | Subject | Re: Stream Lined Booting - SCSI Hold Up |
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On Wed, Jun 05, 2002 at 10:22:40AM -0700, Shane Walton wrote: > Good day, > > I work with US DoD systems, and one of my requirements > is to boot an ix86 based system with an aic7xxx SCSI > interface in 15 seconds. One of the apparent problems > is the SCSI BIOS and aic7xxx driver take a long time > to find one drive and then probe other empty channels. > Is there a way to inform the aic7xxx driver of > connected hardware to limit the initialization phase? > Thanks for the help.
I never thought to disable the reset, getting rid of the SCSI resets probably cuts 10-20 seconds off my boot time.
You can turn of the AIC driver reset, and shorten the selection timeout, see linux/drivers/scsi/README.aic7xxx for details.
With my hardware, I can also disable the BIOS reset, and limit BIOS scanning from the BIOS config screen (hit ctl-A during boot).
On my system, it saves me about 10 seconds to boot with:
lilo: linux-1 aic7xxx=no_reset aic7xxx=seltime:3
There are no options in linux scsi to limit the scanning of the target id's or channels, I don't think there are any in the AIC driver either.
You could hack the driver and lower the max_id, and/or lower max_channel, or somehow disable unused channels, but I doubt it will save much time (7 id's * 2 channels * 32 ms/per-selection-timeout or so).
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