On Tue, 2013-03-05 at 03:25 +0000, Steven Hartland wrote: > ----- Original Message ----- > From: "Karl Denninger" <k...@denninger.net> > > > Stick this in /boot/loader.conf and see if your lockups goes away: > > > > vfs.zfs.write_limit_override=1024000000 > ... > > > If it turns out that the write_limit_override tunable is the one > > responsible for stopping the hangs I can drop the ARC limit tunable > > although I'm not sure I want to; I don't see much if any performance > > penalty from leaving it where it is and if the larger cache isn't > > helping anything then why use it? I'm inclined to stick an SSD in the > > cabinet as a cache drive instead of dedicating RAM to this -- even > > though it's not AS fast as RAM it's still MASSIVELY quicker than getting > > data off a rotating plate of rust. > > Now interesting you should say that I've seen a stall recently on ZFS > only box running on 6 x SSD RAIDZ2. > > The stall was caused by fairly large mysql import, with nothing else > running. > > Then it happened I thought the machine had wedged, but minutes (not > seconds) later, everything sprung into action again. >
I've seen this too. > > Am I correct that a ZFS filesystem does NOT use the VM buffer cache > > at all? > > Correct > > Regards > Steve > > ================================================ > This e.mail is private and confidential between Multiplay (UK) Ltd. and the > person or entity to whom it is addressed. In the event of misdirection, the > recipient is prohibited from using, copying, printing or otherwise > disseminating it or any information contained in it. > > In the event of misdirection, illegible or incomplete transmission please > telephone +44 845 868 1337 > or return the E.mail to postmas...@multiplay.co.uk. > > _______________________________________________ > freebsd-stable@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org" -- Dennis Glatting <d...@pki2.com> _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"
