Date: Sun, 20 Jan 2013 20:53:18 +0100 From: Nicolas Rachinsky <fbsd-mas-0@ml.turing-complete.org> To: Artem Belevich <art@freebsd.org> Cc: freebsd-fs <freebsd-fs@freebsd.org> Subject: Re: slowdown of zfs (tx->tx) Message-ID: <20130120195318.GA24646@mid.pc5.i.0x5.de> In-Reply-To: <CAFqOu6hwms2y%2BP=v%2BuOOEDy_i2B7tuU1V-amTyCw9nvJ7G0t6g@mail.gmail.com> References: <20130114195148.GA20540@mid.pc5.i.0x5.de> <CAFqOu6jwJ4qhbOovN_NhzusdQJvrbvUC3g93sziR=Uw99SGenw@mail.gmail.com> <20130114214652.GA76779@mid.pc5.i.0x5.de> <CAFqOu6jKX-Ks6C1RK5GwZ51ZVUSnGSe7S99_EfK%2BfwLPjAFFYw@mail.gmail.com> <20130115224556.GA41774@mid.pc5.i.0x5.de> <CAFqOu6jJnWdbikPmE1-UML5i_x7meF%2BiyY=9WBRyv2j7AeOaSg@mail.gmail.com> <20130116073759.GA47781@mid.pc5.i.0x5.de> <CAFqOu6j1T1gntgUm6eS1FZZAjoVyZH%2Beq7HAduDsOA36rJ%2BKhA@mail.gmail.com> <20130118112630.GA41074@mid.pc5.i.0x5.de> <CAFqOu6hwms2y%2BP=v%2BuOOEDy_i2B7tuU1V-amTyCw9nvJ7G0t6g@mail.gmail.com>
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* Artem Belevich <art@freebsd.org> [2013-01-18 08:20 -0800]: > On Fri, Jan 18, 2013 at 3:26 AM, Nicolas Rachinsky > <fbsd-mas-0@ml.turing-complete.org> wrote: > > * Artem Belevich <art@freebsd.org> [2013-01-16 00:45 -0800]: > >> On Tue, Jan 15, 2013 at 11:37 PM, Nicolas Rachinsky > >> <fbsd-mas-0@ml.turing-complete.org> wrote: > >> >> You may want to update your system to very recent FreeBSD as quite a > >> >> few fixes were recently imported from illumos. Hopefully it will deal > >> >> with the issue. I'm out of ideas otherwise. Sorry. > >> > > >> > Do you mean -CURRENT or -STABLE with very recent? Or just 9.1? > >> > >> -HEAD or -STABLE (-8 or -9). > > > > I have now updated the machine to stable/8 r245541. I have not updated > > the zpool. > > > > But the problem still occurs. Should I update the pool? Or try other > > things first? > > Updating the pool is an irreversible operation. In general I'd > suggest trying less drastic options first. > > Other people suggested that the problem may be just a side effect of > almost-full filesystem. ZFS needs fair amount of unfragmented free > space in order to work efficiently. If that's what's causing your > problem, then one thing to try would be to free enough free space. The > gotcha there is that you need to free up enough contiguous space. > Removing bunch of recently written files may not help as those writes > would happen on already fragmented FS. Removing files written when FS > had a lot of free space may have better chance of freeing contiguous > space. Old snapshots are good candidates for this. It seems, it was too little free space. I copied some data to another machine and deleted it from this zpool (one part was written on the beginning of December, the other one on the beginning of January). I removed no snapshots and no filesystems. After this everything works fine. Thank you all for your efforts! Nicolas -- http://www.rachinsky.de/nicolas
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