Cannot change kernel tunable: [Auto] filecache_max and min

[TwoProc]

This value is currently set to 1/2 of system memory for both max and min, and its an "auto" tunable. I can't change anything about it, except set it, once again, to "Auto" . Anyone can give me hand with this? I don't want it this high as the Oracle DB will be doing my caching for me, and I need the ram space for that.

[Don Morris_1 · Accepted solution]

You'll have to give more details.

Why can't you change these tunables? Is there an error when you attempt it? What's the exact command you issue? What's the exact result/output?

Also -- what do you want to set these _to_?

It should be fairly simple -- if you want to lower from the default 5%/50% to 2%/10% for example:

kctune filecache_min=2% filecache_max=10%

[TwoProc]

Thanks Don. I had solved it about 2 hrs ago, but got dragged off to a meeting immediately after and before I could update that I resolved it.

kctune is new to me, and I didn't understand why it wouldn't let me change params, until I realized that I couldn't change these two related kern parames one at a time, I had to change them both at once (just like you did).

When I tried to change one, it would complain about the other. So, I had to just get the syntax for doing both at once, and what I was doing was putting a comma between the param settings, for some dumb reason.

Closed: reason; hardheadedness(primary), unknown structure, and syntax issues. :-)