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06373 - Multiple instances on iSeries
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Multiple instances on iSeries
Hi Volker,I checked our system to use ST06->Detail analysis menu and then
> Snapshot Analysis DISK , saw the info. of our system like below:
Wed Jun 5 15:59:29 2002 interval 59 sec.
Disk Resp. Util. Queue Wait Serv Kbyte Oper.
[ms] [%] Len. [ms] [ms] [/s] [/s]
ASP01D03 16 0 0 0 16 0 0
ASP01D01 0 0 0 0 0 0 1
ASP01D02 0 0 0 0 0 0 0
ASP01D04 0 0 0 0 0 0 0
ASP01D05 0 0 0 0 0 0 0
the serv-time of ASP01D03 is 16ms. But the others are 0. Could you
analyze the reason ?
Thanks and Best Regards.
Jenny
--- In SAP on System iZy..., "Gueldenpfennig, Volker"
<volker.gueldenpfennigZs...> wrote:
> Hi Franco,
>
> you are having a slightly high CPU time and a catastrophal DB-time.
>
> I guess, your disks are overloaded.
> Please have a look to ST06->Detail analysis menu and then
> Snapshot Analysis DISK and Previous hours DISK
>
> There you should have a look to the Utilization and a bit more
careful on
> the Serv-time. I'm not sure if the last one is correct in
the "previous
> hours" as well. You should have times of 5 up to maximum 10ms
there -
> especially in ASP 2.
>
> Then you might want to have a look to ST03 and there to the "Time
Profile".
> Have does the Response-time, CPU-Time and the DB-Time changes over
the day,
> espcially in hours with low load ?
>
> Regards
>
> Volker
>
> -----Original Message-----
> From: Franco Tassone [mailto:franco.tassoneZe...]
> Sent: Donnerstag, 30. Mai 2002 17:26
> To: SAP on System iZy...
> Cc: Giampiero Bianchi; Riccardo De Luca
> Subject: RE: Multiple instances on iSeries
>
>
> Many thanks to all the folks who gave us their advices. We won't go
on
> installing multiple instances as our system is not a multi tier on
and
> never it will be.
> We already did a tune up after our upgrade enlarging varios
parameters and
> buffers, but our performances are less than expected.
> Our productive instance is running on an lpar of our iSeries 830,
6,5
> processors (1,5 reserved for another lpar where dev and test
instances
> live) using about 8Gigs ram and about 350 Gigs database (on the IBM
Ess).
> As an example this is the workload registered yesterday, from ST03
>
> SAP System F3C Date 29.05.2002 First record
00:00:01
> Instance no. 01 Last record
23:59:59
> Server S44G9031 Time elapsed
23:59:58
>
>
> CPU time 71.359,5 s Database calls 22.716.903
> Time elapsed 86.398,0 s Database requests
56.716.889
> Direct reads 38.330.078
> Dialog steps 175.700 Sequential reads
16.327.773
> Changes 2.059.038
> Average CPU time 406,1 ms
> Av. RFC+CPIC time 15,9 ms Time per DB request 4,1 ms
> Direct reads 0,7 ms
> Av. response time 2.137,0 ms Sequential reads 10,1 ms
> Average wait time 100,8 ms Changes and commits 18,6
ms
> Average load time 51,8 ms
> Av. Roll i+w time 131,2 ms Roll-in time 2.721,7 s
> Av. DB req. time 1.310,9 ms Roll-out time 4.150,7 s
> Av. enqueue time 0,7 ms Roll wait time 26.569,7 s
> Roll-ins 253.802
> Average bytes req. 152,7 kB Roll-outs 254.369
>
> The following is the buffer and work processes configuration as
show in
> RZ10
>
> ABAP programs 800000 KB
Dialog 24
>
> Nametab 45897 KB Update
(V1) 5
>
> Generic key tables 63477 KB Update
(V2) 2
>
> Single key tables 30000 KB
Enqueue 1
>
> CUA Information 10000 KB
Background 6
>
> Screens 976563 KB
Spool 2
>
>
>
> ==> Initial / max. swap requirement = 11128 MB / 13036
MB
>
> This is what's shown in the WRKSYSSTS screen:
>
> Gestione dello stato del sistema S44G9031
>
30/05/02
> 17:20:55
> % CPU in uso . . . . . . : 15,5 Memoria ausiliaria:
> % capacit?DB . . . . . : 9,8 ASP sistema . . . . . :
324,4
> G
> Tempo trascorso . . . . : 00:00:20 % ASP sistema utiliz. :
> 80,4780
> Lavori nel sistema . . . : 2204 Totale . . . . . . . . :
359,5
> G
> % indirizzi permanenti . : 0,018 Att. non protetta util.:
32718
> M
> % indirizzi temporanei . : 0,068 Massima non protetta . :
53221
> M
> Immettere le modifiche (se consentite) e premere Invio.
> Dim Dim
> Lotto lotto riservata Max -----DB----- ---Non-DB---
> sist. (M) (M) Attiv. Err. Pag. Err. Pag.
> 1 500,00 406,39 +++++ 0,1 0,1 12,9 54,5
> 2 8307,50 0,25 120 20,7 2176 116,7 180,4
> 3 10,00 0,00 5 0,0 0,0 0,0 0,0
> 4 20,00 0,00 10 0,0 0,0 2,4 4,7
>
> Yesterday I enlarged the number of work processes because they
often were
> all busy. Unfortunatelly we also have a large number of "Z"
programs using
> too much the dialog processes I could see this in the transaction
profile
> of the workload analysis. With slight modifies many of them could
rnu in
> the background.
> Unfortunatelly our PTF status is still at CUM1302510 and DB fix
pack #5
> (as described in APAR# II12833 02/06/02) and the kernel patch is
922. The
> reason of the delay in mantaining the ptf & patches was due to
system
> availability reasons. A consultant of ours suggested to update the
system
> to the latest II12833 and to apply kernel patch 1124, because of
our
> performance issue
>
> I know that non-optimized programs are an handicap for our system,
> nevertheless do you think I'll see a prerformance improvements
installing
> the latest APAR + the latest kernel patch ?
> Another question: our ESS shark uses raid-5 for the disk, so our
ASP2
> virtually is a raid-5, instead of a mirror: does this impact on the
> performances too ?
>
> Thanks to everybody.
Durban Tours - Südafrika Safari
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