On Jan 17, 2011, at 8:22 PM, Repetski, Stephen wrote: > > On Mon, Jan 17, 2011 at 22:08, Ian Collins <i...@ianshome.com> wrote: > On 01/18/11 04:00 PM, Repetski, Stephen wrote: > > Hi All, > > I believe this has been asked before, but I wasn’t able to find too much > information about the subject. Long story short, I was moving data around on > a storage zpool of mine and a zfs destroy <filesystem> hung (or so I > thought). This pool had dedup turned on at times while imported as well; it’s > running on a Nexenta Core 3.0.1 box (snv_134f). > > > The first time the machine was rebooted, it hung at the “Loading ZFS > filesystems” line after loading the kernel; I booted the box with all drives > unplugged and exported the pool. The machine was rebooted, and now the pool > is hanging on import (zpool import –Fn Nalgene). I’m using > “0t2761::pid2proc|::walk thread|::findstack" | mdb –k” to try and view what > the import processes is doing, but I’m not a hard-core ZFS/Solaris dev so I > don’t know if I’m reading the output correctly, but it appears that ZFS is > continuing to delete a snapshot/FS from before (reading from the top down): > > What does "zpool iostat <pool> 10" show? > > If you have a lot a deduped data and not a lot of RAM (or a cache device), it > can take a very long time to destroy a filesystem. You will see lot of reads > and not many writes if this is happening. > > -- > Ian. > > > Zpool iostat itself hangs, but iostat does show me one drive in particular > causing some issues - http://pastebin.com/6rJG3qV9 - %w and %b drop to ~50 > and ~90, respectively, when mdk shows ZFS doing some deduplication work > (http://pastebin.com/EMPYy5Rr). As you said the pool is mostly reading data > and not writing much. I should be able to switch up that drive to another > controller (currently on a PCI SATA adapter) and see what iostat reports > then.
%w should be near 0 for most cases. Until you solve that problem, everything will be slow. -- richard
_______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
