620-2181 and 3570-B01 Bad throughput
Hi everyone,
A customer has the following problem:
When running SAVLIB *NONSYS or any other SAVLIB command on a 620 model 2181
and a 3570-B01 tape unit, the backup process seems to pause quite often.
It takes a couple of minutes to save a small library, but saving a program
library with
10.000 objects or a data library with MANY join LFs takes only a couple of
seconds.
The average throughput is far below the specifications.
The system is in restricted state when running the save operation and has
300 Mb+ to
perform the operation.
This is a bit vague problem, but has anyone experienced these problems?
thanks in advance
--
Marcel Groeneweg
Opinions expressed here are my own.
Contact me at Marcel(dot)groeneweg(at)cmg(dot)NOSPAMnl
Luckily, spam enigines aren't THAT smart...(yet)
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compression on the save command. The tape drive itself does the data
compress ion for you. He said if you selected data compression it would
make the tape drive crawl.
Tim Shelton
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take a look at PSP on http://as400service.rochester.ibm.com.
If I remember there is HYPER PTF's for using 3570. (SF98019 : list of hyper
V4R1)
--
Frederic Faure
ETAPES informatique
F 77470 TRILPORT
fau @msn.com
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drives. It turns out that the bottleneck was not the tape drives, but the
AS/400.
We found two things that affected performance of the tape drive. First, we
found that you need to keep the 6501 card for the tape drive on a separate
bus (if possible) from your 6512 disk controllers. The second thing we
noticed is that the disk drives were struggling to keep up. When we had the
3590 on a system with only 16 arms, the average utilization of each disk
drive was between 75-80% during a save/restore. When we put it on a system
that had many more disk arms, we saw massive performance improvements, since
there are more arms to simultaneously access the data.
You may want to do a WRKDSKSTS to check this last part out. Hope this helps
some.
Ray Sullivan
rsull @mfdg.nospam.com
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members. A small library with a couple of source objects in it could
have many many members in the source object. Marking each member takes
time in OS/400. Look at your run light when the tape pauses.
--
R. Gilsdorf
AS/400 System Engineer
Sophisticated Systems Inc.
R @centuryinter.net
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