DLT tape with 3rd party Q-bus SCSI controller?

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2 total messages Started by Timothy D. Shoppa Sat, 05 Aug 1995 04:59

#313

Author: Timothy D. Shoppa
Date: Sat, 05 Aug 1995 04:59

21 lines
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I'm considering getting some DEC TZ85's (2.6 Gig 1/2" cartridge tape drives,
now available from CSC for $695 in singles, even less
in quantity) to replace TK50's and TK70's on my Microvax
3600 and PDP-11/73, both of which already have CMD CQD 440 M/T
controllers.  Is anybody out there already running a similar
configuration (i.e. DLT on a 3rd party Q-bus SCSI controller?)
If so, can you comment about the performance of the DLT; in
particular, about how long does it take to back up 2 gigabytes
or so using either VMS BACKUP or RSX-11M+ BRU?

The reason for an upgrade to a higher-capacity tape drive is
clear; backing up 2 Gigabytes to TK50's is not a fun way to
spend a week.  From what I read, it seems as if DLT is the
way to go.  I know that the TZ85 has an internal cache
that can be enabled when used with a DEC SCSI controller (i.e.
MOUNT/CACHE=TAPE_DATA under VMS); is there a way of enabling this
cache with third party SCSI controllers?  Maybe just a
DIPswitch on the DLT drive itself?

Tim.  (shoppa@altair.krl.caltech.edu)
Kellogg Radiation Lab, Caltech.

Re: DLT tape with 3rd party Q-bus SCSI controller? - Reply

#314

Author: Gary Moore
Date: Sun, 06 Aug 1995 06:07

36 lines
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In a recent posting shoppa@almach.caltech.edu (Timothy D. Shoppa) wrote:

>I'm considering getting some DEC TZ85's (2.6 Gig 1/2" cartridge tape drives,
>now available from CSC for $695 in singles, even less
>in quantity) to replace TK50's and TK70's on my Microvax
>3600 and PDP-11/73, both of which already have CMD CQD 440 M/T
>controllers.  Is anybody out there already running a similar
>configuration (i.e. DLT on a 3rd party Q-bus SCSI controller?)
>If so, can you comment about the performance of the DLT; in
>particular, about how long does it take to back up 2 gigabytes
>or so using either VMS BACKUP or RSX-11M+ BRU?
>
..
>Tim.  (shoppa@altair.krl.caltech.edu)
>Kellogg Radiation Lab, Caltech.

Tim: 

While I cannot help you directly, you should be able to get some assistance
from Quantum Corp.  As you may know, about 18 months ago, they purchased the
DLT division from DEC, and got with it all of the DLT engineers.

I believe the engineering division on the DLT is still back east, but the
corporate tech support BBS is still West Coast.  They do not currently have
support via the Web, but do have a web site at http://www.quantum.com/

Their BBS number is 408-894-3214.

Good luck.
Gary

-- 
Gary Moore, V.P/General Mgr., Sprague Magnetics, Inc.
Web site at http://www.earthlink.net/~sprague-magnetics/
Parts supplier and depot repair of computer peripherals, professional
audio and professional film/video equipment

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