Date: Thu, 30 Apr 2015 16:19:02 +0200 From: Robert David <robert.david.public@gmail.com> To: Martijn <martijn@hostage.nl> Cc: freebsd-fs@freebsd.org Subject: Re: ZFS stuck on write Message-ID: <20150430161902.4868094c@robert-notebook> In-Reply-To: <20150430134659.GA4950@kobol.office.hostage.nl> References: <20150430134659.GA4950@kobol.office.hostage.nl>
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Hi Martin, so few information provided to suggest anything. What about the pool size, free space? Some exceeding quotas? Features enabled (compress,dedup)? Zil, l2arc? Regards, Robert. On Thu, 30 Apr 2015 15:47:00 +0200 Martijn <martijn@hostage.nl> wrote: > Hi, > > I've been trying to get an important production machine stable again since > yesterday afternoon, but to no avail (so far). > > It seems ZFS is the problem on this box. Situation is as follows: > > - it used to be fbsd 8.3. after reading about deadlocks which have been fixed > in the meantime, i upgrade to 10.1, no change, did zpool upgrade, no change > and did zfs upgrade -a also no change... > > - Its a machine on which each user has a separate zfs filesystem with refquota > set. It also did periodic zfs snapshots, every hour (48), day (14) week (8) > month (24), which is way too much but at the time of setting it up i thought > it couldn't hurt. > > - After some usage the machine gets stuck when trying to write a file. The > process just stops and can't be killed. After some time the whole machine > used to become unresponsive in 8.3, but nice 10.1 i can still reach it, > although processes attempting to write get stuck for ever. > > - nothing scary shows in dmesg > > What can i do? The machine has 24GB of registered ECC ram (17GB free), its a > RAID-Z pool with 4 sata hdd's on a LSI SAS3442E-R (1068 chip) in IT mode. > > loader.conf: > > vfs.zfs.arc_max=8G > vfs.zfs.txg.timeout="5" > vfs.zfs.prefetch_disable="1" > vfs.zfs.vdev.min_pending="3" > vfs.zfs.vdev.max_pending="6" > vfs.zfs.txg.write_limit_override=1073741824 > > I've tried to copy the most important users to another machine but thats gonna > take a lot of time. There's 160 users (websites + mailboxes) on it. > > Any help would be much appreciated! > > Thanks in advance, > > Martijn
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