i have a strange memory behavior on a AIX 7.1 System, which i cannot explain.
The Filesystem-Cache will not be grow up and drops often after few minutes. I know if a file was deleted, that the same segment in the FS-Cache will also be cleared. But i am not sure if this is the correct explanation for "my" behavior.
In one test i read a file (dd if=<some file> of=/dev/null) and after the dd finished the fs-cache (file pages) immediately droped out of the memory, but i couldn't reproduce this test.
Does anyone have an idea?
Thanks
P.S.
- tunables like vmo or schedo was not changed
- the System has a lot of nfs V3 exports
Code:
# vmstat -v
6553600 memory pages
6274304 lruable pages
3778457 free pages
2 memory pools
1204754 pinned pages
90.0 maxpin percentage
3.0 minperm percentage
90.0 maxperm percentage
5.4 numperm percentage
342616 file pages
0.0 compressed percentage
0 compressed pages
5.4 numclient percentage
90.0 maxclient percentage
342558 client pages
0 remote pageouts scheduled
34333 pending disk I/Os blocked with no pbuf
0 paging space I/Os blocked with no psbuf
2228 filesystem I/Os blocked with no fsbuf
73667 client filesystem I/Os blocked with no fsbuf
284352 external pager filesystem I/Os blocked with no fsbuf
37.1 percentage of memory used for computational pages
Code:
#lparstat -i
Type : Shared-SMT-4
Mode : Uncapped
Entitled Capacity : 2.00
Partition Group-ID : 32820
Shared Pool ID : 3
Online Virtual CPUs : 4
Maximum Virtual CPUs : 8
Minimum Virtual CPUs : 1
Online Memory : 25600 MB
Maximum Memory : 61440 MB
Minimum Memory : 2048 MB
Variable Capacity Weight : 4
Minimum Capacity : 0.10
Maximum Capacity : 4.00
Capacity Increment : 0.01
Maximum Physical CPUs in system : 64
Active Physical CPUs in system : 32
Active CPUs in Pool : 12
Shared Physical CPUs in system : 12
Maximum Capacity of Pool : 3200
Entitled Capacity of Pool : 420
Unallocated Capacity : 0.00
Physical CPU Percentage : 50.00%
Unallocated Weight : 0
Memory Mode : Dedicated
Total I/O Memory Entitlement : -
Variable Memory Capacity Weight : -
Memory Pool ID : -
Physical Memory in the Pool : -
Hypervisor Page Size : -
Unallocated Variable Memory Capacity Weight: -
Unallocated I/O Memory entitlement : -
Memory Group ID of LPAR : -
Desired Virtual CPUs : 4
Desired Memory : 25600 MB
Desired Variable Capacity Weight : 4
Desired Capacity : 2.00
Target Memory Expansion Factor : -
Target Memory Expansion Size : -
Power Saving Mode : Disabled
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