Re: Help Needed: Tape Backup Save Set
From: Wayne Sewell (wayne_at_tachysoft.com)
Date: 08/17/05
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Date: Tue, 16 Aug 2005 20:25:21 -0500
>From: "AEF" <spamsink2001@yahoo.com>
>X-Newsgroups: comp.os.vms
>Subject: Re: Help Needed: Tape Backup Save Set
>Date: 16 Aug 2005 15:58:01 -0700
>Wayne Sewell wrote:
>> >From: "AEF" <spamsink2001@yahoo.com>
>> >X-Newsgroups: comp.os.vms
>> >Subject: Re: Help Needed: Tape Backup Save Set
>> >Date: 10 Aug 2005 19:52:55 -0700
>> >Organization: http://groups.google.com
>> >Lines: 27
>>
>> >
>> >Z wrote:
>> >> William Webb wrote:
>> >> > If you
>> >> > MOUNT/FOREIGN tape_device tape_label
>> >> > You can
>> >> > BACKUP/LIST tape_device:*
>> >>
>> >> If you're going to use BACKUP, let VMS mount the tape for you.
>> >
>> >Uh, on a v5.4-1 system I had trouble using BACKUP to mount a tape. If I
>> >put in a tape that was not the first save set volume it would screw up
>> >with funny characters reported as the label. Using an explicit
>> >MOUNT/FOR made everything work fine. Ever since then I tend to do an
>> >explicit MOUNT first, except with standalone backup, of course!
>> >
>>
>>
>> This appears to be historical residue from the previous millenium. I was not
>> able to reproduce this behavior on 7.3-2.
>>
>> In the following example, tape DLT038 is a continuation of a saveset
>
>[example omitted]
>
>> [...]
>
>>
>> Sure it got a warning message about not being at the beginning of the saveset,
>> but it certainly had no problems finding the label or mounting the tape.
>
>
>Another reason I like to MOUNT before I BACKUP is that I often have
>very annoying and time-consuming problems with tape drives. Doing an
>explicit MOUNT helps me determine just where the problem is. Waiting
>for the load light to stop blinking before I issue any commands at all
>also helps me determine what is causing a problem. If I just pop in a
>blank tape and do a BACKUP ... /REWIND and there is trouble it is more
>difficult to troubleshoot.
I never, *ever* have problems with tape drives, at not least since I went from
DAT to DLT, so I just simply have backup mount the tape every time. Never
fails.
>
>Additionally, anything that *might* cause trouble, like skipping MOUNT
>when reading the 2nd tape volume, I prefer to avoid just in case it
>causes a problem.
>
>Additionally**2, as lazy as I sometimes can be, it never bothered me to
>have to do a MOUNT/FOR before running BACKUP. Eventually, I did get
>into the habit of skipping the explicit MOUNT, only to have to wander
>yet again through tape-drive headache space.
>
>Remember: I am the author of "I Lost It with the Tape Drive v1.0".
As far as habit is concerned, I rarely issue the backup command directly
anyway. Except for occasional quick tests to experiment with backup behavior,
all my backups, test and production, are performed by tapesys, which
automatically constructs the command lines on the fly from backup definition
files. In particular, tapesys has total control of /[no]rewind, since it
always knows when new tapes are to be started. tapesys will not even let you
try to specify the rewind qualifier yourself.
tapesys does a manual mount, but this is for the purpose of validating that the
operator mounted the correct tape. If not, tapesys dismounts/unloads the tape
and tells him/her to mount the right one. All this is done at dcl level before
even bringing vms backup into the picture.
===============================================================================
Wayne Sewell, Tachyon Software Consulting (281)812-0738 wayne@tachysoft.com
http://www.tachysoft.com/www/tachyon.html and wayne.html
===============================================================================
Jake Blues:"You traded the Caddy for a microphone? ...... Okay, I can buy that."
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