Shmmax and 11g

I am investigating 11g installation and config on an HP x86_64 Redhat server. The Oracle Validated RPM adjusted shmmax in sysctl.conf to 4T. This corresponds to what is seen at
http://linux.oracle.com/pls/apex/f?p=102:2:1240694098498237::NO::P2_VC_ID:471
With this setting and a suitable memory_max_target parameter, the database produced "unable to attach to shared memory segment" and similar errors after some time under load. The error does not appear with more traditional shmmax settings of 1/2 RAM or similar.
Am I missing something? Is 4T correct and without side effects? Am I missing something?

mosborn wrote:
I am investigating 11g installation and config on an HP x86_64 Redhat server. The Oracle Validated RPM adjusted shmmax in sysctl.conf to 4T. This corresponds to what is seen at
http://linux.oracle.com/pls/apex/f?p=102:2:1240694098498237::NO::P2_VC_ID:471
With this setting and a suitable memory_max_target parameter, the database produced "unable to attach to shared memory segment" and similar errors after some time under load. The error does not appear with more traditional shmmax settings of 1/2 RAM or similar.
Am I missing something? Is 4T correct and without side effects? Am I missing something?In your context ... what does suitable memory_max_target mean.
Generally i would wish the sum (memory_max (or memory_max_target if greater)) for all active instances to be less (and prehaps well less) than 3/4 of my physical ram under virtually all circumstances.
Having that 4T seems excessive .... 64G or so would be well enough over the top for most servers.
Confirm also your running 64bit and that your not doing hugepages or something.
I feel like I have just stated some obvious checks, and apologies if you've already done this.
Rgds - bigdelboy.

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Think of it as an opporunity
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