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12468 - to ASP2 or not to ASP2 on new hardware ?
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to ASP2 or not to ASP2 on new hardware ?
Paul
I don't use a separate asp for journal receivers. The reason is that I got
performance problems during mass update. The disk arms "get red" and that
was a bottleneck. On the other hand I do trust IBM and the raid5 concept.
But you never know. If two disks fails in the same raidset - you are a
loser. If I should use a asp for journeling I will say a complete raidset
of 4-5 disks would be fine in all cases.
Regards
**************************************************
Per-Lennart Andersson
Coca-Cola Drycker Sverige AB
Tel +46 8 5007 5057 Mobil +46 70 320 5743
parofZxs4all.n
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2004-01-05 Subject: to ASP2 or
not to ASP2 on new
11:55 hardware ?
Please respond
to
SAP on System i
Dear gang,
I the past I've allways configured a separate mirrored ASP2 on 2 separate
disks for the SAP journals. I did this for performance as well as
availability reasons: no journal parity stripes are so being written to the
same disks containing SAP data, I/O for data and journals is completely
separated.
But now IBM is telling me that you no longer need a separate asp for the
journal receivers (from a performance point of view)
Is this true also in a heavily used SAP environment (ie a 870 with
eventually 1000 users)?
And from witch hardware / software on?
What about I/O intensive tasks such as client copies / deletions where
there is a lot of disk activity on both the SAP data disks as well as on
the journals?
What is the official SAP-iSeries CC possition on this? Tomorrow I will
install a new 870, and I want to mirror 2 separate disks in an ASP2 for
journals, but everybody (customer, IBM, HW vendor) is telling me that is is
no longer needed. But I feel that despite of all the new HW with enormeous
amounts of DASD cache, it is still better (in extreme situations) not to
mix SAP data I/O and journals I/O on hte same disks.
Thanks in advance,
Ir. H. Paul Hoogendoorn
SAP Certified technical consultant iSeries-AS/400
PaROF. BV
Tel 033-455 99 51
Fax 033-455 99 54
GSM 06-55 77 08 83
E-Mail Paul.HoogendoornZParof.nl
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