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- Newsgroups: comp.sys.sgi
- Path: sparky!uunet!stanford.edu!rock!taco!cfd.mae.ncsu.edu!garvin
- From: garvin@cfd.mae.ncsu.edu (Michael Garvin)
- Subject: More Exabyte 8500c (and SCSI) questions/woes
- Message-ID: <1992Nov19.201853.28678@ncsu.edu>
- Sender: news@ncsu.edu (USENET News System)
- Organization: North Carolina State University
- Date: Thu, 19 Nov 1992 20:18:53 GMT
- Lines: 60
-
- I've also taken receipt of an Exabyte 8500c (compression) 8mm tape
- drive, and it's giving me pains. Following the instructions in Dave Olson's
- posting of 17 Nov 92 (thanks for the info!) I reconfigured my kernel, altering
- the tpsc config file to read:
-
- /* Entry for Exabyte 8500c - Michael Garvin, 11/19/92. Copied entry
- * from 8500, changed "EXB-8500" to "EXB8500c", "{0x0, 0x14, 0x0, 0x0}"
- * to "{0x0, 0x14, 0x8c, 0x0}".
- * There are 3 densities, 8500 mode, 8200 mode, and 8500 mode with
- * compression, in order.
- */
- { EXABYTE8500, TP8MM, 7, 8, "EXABYTE", "EXB8500c", 6,
- "\40\4\16\0\200\7", {0x0, 0x14, 0x8c, 0x0},
- MTCAN_BSF|MTCAN_BSR|MTCAN_PREV|MTCAN_CHKRDY|MTCAN_VAR|MTCAN_SETSZ|
- MTCAN_SILI|MTCAN_CHTYPEANY|MTCAN_SETDEN|MTCAN_SPEOD|MTCAN_SYNC|
- MTCAN_SEEK,
- 80, 4*60, 25*60, 5*60, 1024, 128*1024},
-
- I installed the drive on controller 0, ID 7, and rebooted the new kernel. I
- then made the following devices:
-
- crw-r--r-- 1 root sys 23,241 Nov 19 14:13 nrtape
- crw-r--r-- 1 root sys 23,243 Nov 19 14:13 nrtapens
- crw-r--r-- 1 root sys 23,240 Nov 19 14:13 tape
- crw-r--r-- 1 root sys 23,242 Nov 19 14:30 tapens
-
- The minor numbers were upped 16 from the default 224-227 to match the 8500c
- (0x8c in the tpsc config file) entry. I then tried tarring to the drive, which
- died with the following error:
-
- tar: tape write error: I/O error
-
- and produced the following console output (note the tape drive hiccuped first):
-
- WARNING: dma_map: address not word aligned
- sc0,7,0: cmd=0xA disconnected on non-word boundary (addr=C02185A9,
- 0x0 left). Resetting SCSI bus
- dks0d1s6: retrying request
- dks0d2s6: retrying request
-
- Our setup is a Power Series 4D/440. SCSI controller 0 has an internal 1.6 gig
- system disk (ID 1), an Iris File on the rear external connector with four 2 gig
- drives (IDs 2, 3, 4, and 5), an internal CD-ROM (ID 6), and the 8500c mounted
- internally (ID 7). We've also got a Jaguar differential SCSI controller with
- four drives on each channel.
-
- My questions are: am I going too far with that SCSI chain? I have a
- sinking feeling that I'm pushing the length limit, giving me the error I saw
- (although the 8500c failing might give me that). Are my entries for the 8500c
- in the tpsc config file correct? Have I correctly made the devices (in
- particular, did I get the minor number correct and do they correspond to the
- 8500c in compression mode)? And finally, would someone have the correct density
- to feed to BSD dump for this drive (I calculated something around 47.5 million,
- which sounds wrong). Thanks for any help, I'm banging my head at this point.
-
- --
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- Michael Garvin - Systems Programmer garvin@mmrc.ncsu.edu
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