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тАО05-05-2009 05:10 AM
тАО05-05-2009 05:10 AM
On Integrity (VMS V8.3-1H1, latest patches) it seems that the SKIP TO END OF TAPE takes quite long time.
Tape drive is MSL6060 with E1200-320, same device for both clusters.
My hunch would be that on ALPHA ABS/VMS did perform FASTSKIP to end of tape and on Integrity for whatever reason ABS/VMS might do much slower SKIP BY RECORD
Anybody having same problem?
Solved! Go to Solution.
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тАО05-05-2009 05:19 AM
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тАО05-05-2009 05:21 AM
тАО05-05-2009 05:21 AM
Re: FASTSKIP not working on iVMS V8.3-1H1???
if you look at the tape from SDA, while such a 'skip' operation is underway, you may see the current IO function and the modifiers:
$ ANAL/SYS
SDA> SHOW DEV $2$MGAx
...
Volker.
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тАО05-05-2009 05:36 AM
тАО05-05-2009 05:36 AM
Re: FASTSKIP not working on iVMS V8.3-1H1???
Or try /fast=always.
Wim
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тАО05-05-2009 06:29 AM
тАО05-05-2009 06:29 AM
Re: FASTSKIP not working on iVMS V8.3-1H1???
It would assume that it does SKIP BY FILE as it "needs to count" the filemarks so it is able to put that informantion into history file along with saveset name etc stuff.
After ABS(?) has reached "end of tape" it will actually start the real backups as subprocesses.
And now it seem that ABS on Integrity spends every day longer and longer before we get to real work.
I already suggested customer $SET MAGETAPE/SKIP=ALWAYS $2$MGAx:
Also I was planning as a test
$ set noon
$ mount/fore/nounload 'device'
$ show time
$ set magt/skip=end 'device'
$ show time
$ dismount/nounload 'device'
to be done from both Alpha and Inegrity against same tape libary/tape drive/tape
so as to see whether there would some major
difference between a ES40 running V7.3-2
and RX6600 running V8.3-1-1H1 (with pretty much uptodate patches)
_veli
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тАО05-05-2009 07:50 AM
тАО05-05-2009 07:50 AM
Re: FASTSKIP not working on iVMS V8.3-1H1???
did you check for a ABS_NO_FAST_SKIP logical (see Guide to Operations chapter 12.1.5) ├Г
Volker.
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тАО05-05-2009 10:24 AM
тАО05-05-2009 10:24 AM
Re: FASTSKIP not working on iVMS V8.3-1H1???
well, takes some time before I get some hard facts since this is a customer system.
_veli
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тАО05-06-2009 09:24 PM
тАО05-06-2009 09:24 PM
Re: FASTSKIP not working on iVMS V8.3-1H1???
Customer tests indicate that
$ mount/fore/nounload 'device'
$ set magtape/skip=end 'device'
takes much longer when $SET MAGTAPE/FAST=PER_IO
compared to $SET MAGTAPE/FAST=ALWAYS.
However this behaviour was observed both on cu old ALphas and new Integritys.
The underlying problem is not solved really but at least we appear to have now a intermediate workaround for the issue.
thanks everybody
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тАО05-06-2009 11:39 PM
тАО05-06-2009 11:39 PM
Re: FASTSKIP not working on iVMS V8.3-1H1???
Wim
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тАО05-07-2009 02:05 AM
тАО05-07-2009 02:05 AM
Re: FASTSKIP not working on iVMS V8.3-1H1???
this may be a question of defaults ...
If you SET MAG/FAST=PER_IO (or if this is the default setting), each IO$_SKIPFILE QIO would require the IO$M_ALLOWFAST modifier for fast skip operation. SET MAG/SKIP=END does use a simple IO$_SKIPFILE QIO with P1 = 32767, so it would NOT honour the /FAST=PER_IO setting.
SET MAG/FAST=ALWAYS would always try to use the fast method.
A SHOW DEVIVE/FULL tape should tell you the fastskip settings as
'device supports fastskip' with an additional (always) or (disabled) or (per_io)
These settings are in UCB$L_DEVDEPND2 - visible with SDA.
Volker.