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- From: olson@anchor.esd.sgi.com (Dave Olson)
- Subject: Re: HP DAT drive on PI has trouble with large block sizes
- Message-ID: <tum7np8@zuni.esd.sgi.com>
- Sender: news@zuni.esd.sgi.com (Net News)
- Organization: Silicon Graphics, Inc. Mountain View, CA
- References: <BzMDuq.E7t@well.sf.ca.us>
- Date: Wed, 23 Dec 92 04:30:39 GMT
- Lines: 32
-
- In <BzMDuq.E7t@well.sf.ca.us> gaarder@well.sf.ca.us (Steve Gaarder) writes:
-
-
- | We have an HP DAT drive connected to a Personal Iris 4D/20 running Irix
- | 4.0.5. I modified /usr/sysgen/master.d/tpsc to allow the machine to
- | identify the unit as a DAT, and that seems to have worked. However,
- | when I try to use a tar blocking factor greater than 64 (= a block size
- | greater than 32768), I get the following error:
- |
- | sc0,7,0: cmd=0x8 disconnected on non-word boundary (addr=C05CB402, 0x0 left).
- | Resetting SCSI bus
- |
- | I have the same problem when I put the drive on a 4D/35. Any ideas
- | what's going on here?
-
- You need to bug Ardat or your distributor for newer firmware.
- Almost certainly this is not a drive purchased from SGI. I
- asked Ardat to put the fix into their standard firmware, since
- SGI isn't the only system with problems on non-word aligned
- DMA (which is what happens when the drive disconnects on
- a boundary not a multiple of 4 bytes from start of transfer).
-
- They said they would do put it in their next general firmware
- release, but either that hasn't happened, or you have
- older firmware.
-
- There is no workaround except to disable SCSI disconnects,
- which has problems of its own (see master.d/scsi).
- --
- Let no one tell me that silence gives consent, | Dave Olson
- because whoever is silent dissents. | Silicon Graphics, Inc.
- Maria Isabel Barreno | olson@sgi.com
-