64 bit AIX - increase SHMMAX??

[Axr2]

I have a 5G SGA that gets split up into 3 shared segments of 2G,2G and 1G.

I assume it's happening because SHMMAX is set to a max of 2G at the kernel level. How do I up this to unlimited on AIX?

Thanks.

[hrishy]

Hi

shmmax Purpose: Specifies maximum shared memory segment size.
Values: Dynamic with maximum value of 256 MB for 32-bit processes and 0x80000000u for 64-bit
Tuning: Does not require tuning because it is dynamically adjusted as needed by the kernel.

regards
Hrishy

[Axr2]

Values: Dynamic with maximum value of 256 MB for 32-bit processes and 0x80000000u for 64-bit
Tuning: Does not require tuning because it is dynamically adjusted as needed by the kernel.

Thanks. So you're saying 3 shared segments of 2G,2G,1G is normal behavior (with a 5G SGA)?! And I needn't bother accomodating the SGA in a single shared memory segment?

[hrishy]

Hi

With AIX yes.

raise a TAR with metalink also and you can confirm this.

regards
Hrishy

[tamilselvan]

AIX does not have SHMMAX parameter.

Tamil