CPC3722 message gives time the save started - message time would be end of
save.
To augment my earlier post that had results from a run of 1, I have the
following on a 9406-270 2248. I bracketed the SAVLIB commands with
WRKSYSSTS RESET(*YES) before and RESET(*NO) after, which gives elapsed time
and CPU% over the run. Also cleared the SAVFs first, to eliminate that
processing-probably not too important, but maybe. CPU% in mid-90's for all
compressed runs, around 30% for non-compressed.
The first library comprises mostly PFs and DTAARAs and is 67.6 MB
SAVF Size Elapsed
DTACPRNO 70,270,976 00:00:08
DTACPRYES 32,530,432 00:00:18 46%
DTACPRLOW 32,530,432 00:00:18 46%
DTACPRMED 11,554,816 00:01:05 16% 3-1/2 times as long
DTACPRHIGH 6,311,936 00:02:22 9% 2 times as long
The second library comprises PGMs, source PFs, etc., and is 2,401.2 MB
SAVF Size Elapsed
DTACPRNO 2,502,967,296 00:09:30
DTACPRYES 1,524,711,424 00:11:55 60%
DTACPRLOW 1,524,711,424 00:11:57 60%
DTACPRMED 741,359,616 00:42:43 30% 4 times as long
DTACPRHIGH 664,027,136 04:01:07 27% 6 times as long
Mileage varies because different types of objects compress differently -
programs are not going to compress as well as text data, e.g. 7 to 24 times
as long for *HIGH over *LOW, 2 to 6 times as long for *HIGH over *MEDIUM.
I guess it all depends, whether to go all the way to *HIGH. 6 times as long
to save 3% does not seem worth it. Jeff's case, OTOH, seems viable.
You pays your money...
Vern
At 11:24 AM 10/4/2004, you wrote:
Hey, anything in your joblogs to indicate the start/stop time before and
after the data compression was changed? Want to see if the new
compression slowed it down, so's as you would notice. Just curious, not
trying to compare to anything here. Just always hearing the saw about
performance and I want to check.
Rob Berendt
--
Group Dekko Services, LLC
Dept 01.073
PO Box 2000
Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com
rob@xxxxxxxxx
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RE: Tape backup strategy
Glad to hear that. The new compression is IMPRESSIVE!
Rob Berendt
--
Group Dekko Services, LLC
Dept 01.073
PO Box 2000
Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com
"Jeff Crosby" <jlcrosby@xxxxxxxxxxxxxxxx>
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RE: Tape backup strategy
> True, but it's rather tough to do hardware compression on a save file.
There are various areas where I do saves to a save file just prior to some
big batch update process. I also do a SAVLIB twice a day of our main
database library to 2 different save files, then put these 2 save files
onto
a single tape.
After you posted your message last week about the new options on the
DTACPR
parm, I changed all these to *HIGH. Since Friday, my disk usage has gone
from ~70% to ~52%. And no one has complained about performance. <g>
--
Jeff Crosby
Dilgard Frozen Foods, Inc.
P.O. Box 13369
Ft. Wayne, IN 46868-3369
260-422-7531
The opinions expressed are my own and not necessarily the opinion of my
company. Unless I say so.
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