Re: Adaptec AIC7902 Ultra320 Problems

From: Justin T. Gibbs (gibbs_at_scsiguy.com)
Date: 07/22/03

  • Next message: Mark Murray: "Re: make release broken [FIX]" 
    Date: Tue, 22 Jul 2003 10:46:07 -0600
To: Lawrence Farr <bsd-current@epcdirect.co.uk>, current@freebsd.org

    > I have a Supermicro SuperServer 6013P-8, with:
    >
    > ahd0: <Adaptec AIC7902 Ultra320 SCSI adapter> port
    > 0x4000-0x40ff,0x4400-0x44ff mem 0xfc300000-0xfc301fff irq 5 at device 2.0 on
    > pci3
    > aic7902: Ultra320 Wide Channel A, SCSI Id=7, PCI-X 101-133Mhz, 512 SCBs
    > ahd1: <Adaptec AIC7902 Ultra320 SCSI adapter> port
    > 0x4800-0x48ff,0x4c00-0x4cff mem 0xfc302000-0xfc303fff irq 5 at device 2.1 on
    > pci3
    > aic7902: Ultra320 Wide Channel B, SCSI Id=7, PCI-X 101-133Mhz, 512 SCBs
    >
    > Trying to install 5.1-CURRENT-20030709-JPSNAP or 4.8-STABLE on the
    > box gives a timeout error that will hang the disk in a state that
    > resetting the machine does not clear, and only power cycling will
    > clear. Ive replaced the disks with no change, but installed and
    > ran Redhat 7.3 on the box with no timeouts or errors.

    The problem you are encountering looks to be a drive firmware issue
    exposed when the drive is running at high queue depths. The linux
    driver limites the tag depth to 32 by default. The FreeBSD driver
    does not throttle in this way. It seems that we just overwhelm the
    drive with commands and it just stops doing anything on the bus. According
    to the timeout trace, the target just stopped sending packets while
    still sitting on the bus.

    I have not tested this particular drive, so I do not know if update
    firmware is available for it. You might try running in non-packetized
    mode by toggling this option via SCSI-Select. You previous test of
    running at "160" just reduced the clock rate, but still allowed the use
    of the newer, faster, packetized format. 

    --
Justin
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