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Author Topic: [AIX 5.3] P520 Upgrade gives Paging Faults?  (Read 9975 times)

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Maarten Visser

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[AIX 5.3] P520 Upgrade gives Paging Faults?
« on: August 12, 2008, 07:11:46 AM »
I upgraded 2 of our Production Machines from AIX 5.2 to AIX 5.3 (numerous of reasons it just had to go after 1,5 year).
It isn't really a verry big deal but it get's my attention now that i get a lot of Paging Faults at "topas" and vmstat.
I just want to know if my values are a reason to concern or that it's normal behaviour.

For explanation:

System Model: IBM,9111-520
Processor Type: PowerPC_POWER5
Number Of Processors: 2
Processor Clock Speed: 1499 MHz
CPU Type: 64-bit
Kernel Type: 64-bit
Memory Size: 15808 MB
Good Memory Size: 15808 MB
Platform Firmware level: SF240_338
Running Oracle 9.2.0.7 with 15 Databases.

vmstat output:
kthr    memory              page              faults        cpu
----- ----------- ------------------------ ------------ -----------
 r  b   avm   fre  re  pi  po  fr   sr  cy  in   sy  cs us sy id wa
 0  0 1960455 135771   0   0   0   0    0   0 359 5165 1674  3  8 88  1
 1  0 1960455 135771   0   0   0   0    0   0 1573 20354 5944 16 35 48  0
 1  0 1960455 135771   0   0   0   0    0   0 384 6090 1867 10 10 80  1
 0  0 1960451 135775   0   0   0   0    0   0 624 9166 2713  4 15 79  2
 1  0 1960455 135771   0   0   0   0    0   0 984 14998 4375  8 22 68  1
 0  0 1960458 135768   0   0   0   0    0   0  83 1156 620  1  1 98  0
 1  0 1960455 135771   0   0   0   0    0   0 167 2082 940 11  2 84  3

Topas:
Paging:
Faults  8466
..
...
PgOut  86
Sios   189


Can someone tell me that these vlaues are ok? ::)

Michael

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Re: [AIX 5.3] P520 Upgrade gives Paging Faults?
« Reply #1 on: August 15, 2008, 11:15:03 AM »
A page fault is not an error. Page fault is the term used to indicate that a page was desired that was not in memory. AIX 5.3 uses a bit more memory, and 64bit mode uses more memory still. Not a lot, but it might change your statistics a bit.

However, based on the amount of free memory, I suspect it is just your application's loading memory overtime.