Date: Sun, 06 Jan 2008 17:22:07 +0100 From: Kris Kennaway <kris@FreeBSD.org> To: Maciej Suszko <maciej@suszko.eu> Cc: freebsd-current@freebsd.org Subject: Re: When will ZFS become stable? Message-ID: <4781002F.5020708@FreeBSD.org> In-Reply-To: <20080106170544.93f7ab1b.maciej@suszko.eu> References: <fll63b$j1c$1@ger.gmane.org> <20080104163352.GA42835@lor.one-eyed-alien.net> <9bbcef730801040958t36e48c9fjd0fbfabd49b08b97@mail.gmail.com> <200801061051.26817.peter.schuller@infidyne.com> <9bbcef730801060458k4bc9f2d6uc3f097d70e087b68@mail.gmail.com> <4780D289.7020509@FreeBSD.org> <20080106144627.a91a62c1.maciej@suszko.eu> <4780F7C0.5010101@FreeBSD.org> <20080106170544.93f7ab1b.maciej@suszko.eu>
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Maciej Suszko wrote: > Kris Kennaway wrote: >> Maciej Suszko wrote: >>> Kris Kennaway wrote: >>>> Ivan Voras wrote: >>>>> On 06/01/2008, Peter Schuller <peter.schuller@infidyne.com> wrote: >>>>>>> This number is not so large. It seems to be easily crashed by >>>>>>> rsync, for example (speaking from my own experience, and also >>>>>>> some of my colleagues). >>>>>> I can definitely say this is not *generally* true, as I do a lot >>>>>> of rsyncing/rdiff-backup:ing and similar stuff (with many files / >>>>>> large files) on ZFS without any stability issues. Problems for me >>>>>> have been limited to 32bit and the memory exhaustion issue rather >>>>>> than "hard" issues. >>>>> It's not generally true since kmem problems with rsync are often >>>>> hard to repeat - I have them on one machine, but not on another, >>>>> similar machine. This nonrepeatability is also a part of the >>>>> problem. >>>>> >>>>>> But perhaps that's all you are referring to. >>>>> Mostly. I did have a ZFS crash with rsync that wasn't kmem >>>>> related, but only once. >>>> kmem problems are just tuning. They are not indicative of >>>> stability problems in ZFS. Please report any further non-kmem >>>> panics you experience. >>> I agree that ZFS is pretty stable itself. I use 32bit machine with >>> 2gigs od RAM and all hang cases are kmem related, but the fact is >>> that I haven't found any way of tuning to stop it crashing. When I >>> do some rsyncing, especially beetwen different pools - it hangs or >>> reboots - mostly on bigger files (i.e. rsyncing ports tree with >>> distfiles). At the moment I patched the kernel with >>> vm_kern.c.2.patch and it just stopped crashing, but from time to >>> time the machine looks like beeing freezed for a second or two, >>> after that it works normally. Have you got any similar experience? >> That is expected. That patch makes the system do more work to try >> and reclaim memory when it would previously have panicked from lack >> of memory. However, the same advice applies as to Ivan: you should >> try and tune the memory parameters better to avoid this last-ditch >> sitation. > > As Ivan said - tuning kmem_size only delay the moment system crash, > earlier or after it happens - that's my point of view. So the same question applies: exactly what steps did you take to tune the memory parameters? Extracting this information from you guys shouldn't be as hard as this :) Kris
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