SHM, Issue attaching Oracle >500MB shared mem

["Javan Dempsey" <raz@mailhost.directlink.net>]

Hello,
	We're currently running a number of Linux based ia32 Oracle 8.0.5 DB Servers, and we seem to be running into a problem with attaching to > 500MB shared mem. I've increased SHMMAX and tweaked various other things in an attempt to fix the problem. Nothing seems to work, no matter what SHMMAX is set to, or anything else. SVRMGRL gives this error when trying to startup -

SVRMGR> startup open
ORA-27123: unable to attach to shared memory segment
Linux Error: 22: Invalid argument
SVRMGR>

 which seems to be an a shmat() error. Oracle is dumbfounded with the problem, and I'm not very familliar with the mm part of the kernel. The machine I am speaking of is a Quad Proc Dell PowerEdge 6350, with 4GB of physical mem, and 4GB of swap. Running a few of Kanoj's patches, along with his latest BIGMEM patch, although I've also tried stock kernels, and some of the -AC kernels. Actually, with 2.2.10-ac11, and the quick hack to support 2GB of mem, I couldnt use much more than 150MB of shared mem. The current configuration has gotten me the furthest, but still no dice. I've also tried this on various machines of different configs, i.e. some dual proc's (which shouldnt matter anyway I suppose), some with 1 or 2GB mem, and such. Anyone have any suggestions?


 Thank you,
	Javan Dempsey
	Senior Unix Admin.
	ICelebrate.Com Inc.
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