user5749629 wrote:Was this a DB bug or a Linux bug?
Thanks for the tip. The "remount" worked. However - I seem to be running into an old Oracle bug where MEMORY_TARGET cannot exceed 256GB. It was broken in OEL 5.5 and fixed in 5.7. Now with 6.3 it seems broken again.
I have 1 TB of RAM and wanted TMPFS set at 855GB so that I can set MEMORY_TARGET to 850GB. Simple AMM, no hugepages for starters.Yeesh. We recommend hugepages for anything over 8GB, so it's definitely required for 1TB. Either way, I'd open an SR with Oracle Support so they can troubleshoot whether the issue is in DB or the kernel. You don't say if you're running the RHCK (2.6.32) or UEK2 (2.6.39) kernel on OL6U3. Might want to try switching to the other one and seeing if you still have the issue.