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From: lampi@polari.UUCP (Michael Lampi)
Newsgroups: comp.sys.apollo
Subject: Re: Exabytes on Series 400's
Message-ID: <4563@polari.UUCP>
Date: 24 Jun 91 22:20:09 GMT
References: <9106241630.AA16316@pan.ssec.honeywell.com>
Organization: R Squared, Redmond, WA (206) 883-3116
Lines: 44

In article <9106241630.AA16316@pan.ssec.honeywell.com> thompson@PAN.SSEC.HONEYWELL.COM (John Thompson) writes:
->
->
->> Third, 8200's and 8500's work under Domain/OS in many cases, but not on a
->> Mentor node, and tar sometimes has i/o troubles that are bit-pattern specific
->> that don't occur with wbak or rbak. 
->> 
->> "Not on a Mentor node" means that the  [Mentor]
->> node crashes immediately with status 440002, meaning "bad iova from os/dio
->> bus manager" when using rbak, wbak and rwmt, but tar, cpio, mt, etc., all
->> execute flawlessly, and netstat -c reports no tape drives while scsi_info
->> reports a tape drive at SCSI ID 1.
->> 
->> Has anyone else seen this behavior? Any solutions? Any reason why HP has
->> decided to support 8mm tape drives under HP-UX (or Unix in general) and
->> not support the Domain/OS utilities?
->At 10.1, you needed a PSK and patch (set of patches?) to get the SCSI 
->devices going.  At 10.2 and beyond, these were included in the base O/S.
->At 10.3, they seem to have added official support for a 3rd and 4th tape
->drive (rmts8, 9, 10, 11 are all there now on our nodes, along with the
->non-rewinding devices rmts12 .. rmts15).  They also added (at 10.3) 
->support for the Domain utilities rbak and wbak.  The device is 'm' in this
->case.  It takes a looonnnnggg time while it plays around (checking for a
->real magtape device???), but then it works just fine here with a normal
->10.3 load.
->
->-- jt --
->John Thompson
->Honeywell, SSEC
->Plymouth, MN  55441
->thompson@pan.ssec.honeywell.com
->

The Mentor node claims to be at SR10.3, and it has the most problems. Other
'non-Mentor' 9000/4XX nodes at 10.3 don't seem to have these problems.

BTW, the looonnnnggg (sp?) time Exabytes spend playing around is due to the
'ANSI-like' labeling and relabeling of the tape. Writing filemarks takes the
majority of the time, and rewinding, etc. takes the rest.


-- 
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Michael Lampi            polari!lampi@sumax.seattleu.edu