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. Until then, I'll keep the zpool import running and see what the box does... Thanks, Trey -- *Stephen Repetski* BS Applied Networking and Systems Administration, 2013 Rochester Institute of Technology, Thomas Jefferson HS S&T skr3...@rit.edu | srepe...@srepetsk.net http://srepetsk.net
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