Date: Mon, 27 Aug 2007 03:14:01 -0700 (PDT) From: Juri Mianovich <juri_mian@yahoo.com> To: freebsd-fs@freebsd.org Subject: How do I get back my previous minfree level of performance ? Message-ID: <72418.68169.qm@web45612.mail.sp1.yahoo.com>
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I know of a way to beat up (stress) an aac controller that will cause it to crash.
I have put safeguards in place to make sure that this never happens.
It is well known that going to a minfree level of ZERO on a disk that is near-full is very stressful on the system.
Last night, I took a 1.8 TB filesystem with only 10 GB of free space and changed it from:
minfree=1
to:
minfree=0
and suddenly the aac0 controller starts dying on me. OOPS. Ok, no problem, I did not use any of the space I gained yet, so I will just go right back to a minfree of "1".
So basically, I changed my minfree: 1 -> 0 -> 1
But the problem is, the crashes that going to zero caused _persist_ after going back to one.
So my question is, what did I leave behind ? And how do I get back to a "real" minfree of 1, and not this broken minfree of 1 that I currently have ?
The environment has been carefully controlled - this is the only change that has occurred and this aac0 controller halting has not happened in 300+ days of continuous operation ... it is definitely the move to a minfree of zero that stressed out the aac driver...
Comments ?
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