Date: Thu, 21 Jan 2016 18:28:10 -0500 From: Mason Loring Bliss <mason@blisses.org> To: dweimer <dweimer@dweimer.net> Cc: freebsd-questions@freebsd.org Subject: Re: ZFS performance help sought Message-ID: <20160121232810.GJ4538@blisses.org> In-Reply-To: <ea3f05f9a8c20bd62a1c391b432dafe2@dweimer.net> References: <20160121205139.GG4538@blisses.org> <ea3f05f9a8c20bd62a1c391b432dafe2@dweimer.net>
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On Thu, Jan 21, 2016 at 03:35:23PM -0600, dweimer wrote: > Try Starting here: > https://wiki.freebsd.org/ZFSTuningGuide#General_Tuning I'd looked at that previously, but as noted, I'd already tried capping the ARC, and txg.timeout is already five by default in FreeBSD. My reading about prefetch_disable suggests that it's meant for big transactions like what I'm doing, but I could be confused. All that said, I wasn't setting write_limit_override, so I'm trying that, and I'm cutting the txg.timeout back a couple seconds more. Am I confused about prefetch, though? They're talking about it as being problematic for small, random I/O operations, where I'm doing big, chunky I/O operations. Anyway, thanks for the ideas. I'll write back with results presently. -- Mason Loring Bliss (( If I have not seen as far as others, it is because mason@blisses.org )) giants were standing on my shoulders. - Hal Abelson
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