[OpenIndiana-discuss] ZFS stalls with oi_151?

George Wilson george.wilson at delphix.com
Fri Oct 21 17:31:07 UTC 2011


I believe you're hitting a kernel fragmentation issue which causes the system to hang waiting for memory.  I have a fix which may help you. I'm be submitting this for review in the next day or two.


On Oct 21, 2011, at 9:06 AM, Bryan S. Leaman wrote:

> On 10/21/2011 4:16 AM, Tommy Eriksen wrote:
>> Hi guys,
>> I've got a bit of a ZFS problem:
>> All of a sudden, and it doesn't seem related to load or anything, the system will stop writing to the disks in my storage pool. No error messages are logged (that I can find anyway), nothing in dmesg, messages or the likes.
>> ZFS stalls, a simple snapshot command (or the likes) just hangs indefinitely and can't be stopped with ctrl+c or kill -9.
>> Today, the stall happened after I had been running 2 VMs on each (running on vsphere5 connecting via iscsi) running iozone -s 200G (just to generate a bunch of load). Happily, this morning, I saw that they were still running without problem and stopped them. Then, when asking vSphere to delete the VMs, all write I/O stalled. A bit too much irony for me :)
> I've been trying to track down a similar stall/hang on 151a for several weeks.  I filed an Illumos bug on it, and I've been trying to debug this myself but I'm not having much luck.  Can you enable kmdb (boot with -k option) and force a crash dump when the IO stalls?  I'm curious to know if it looks like the same issue.
> See http://www.illumos.org/issues/1618
> Bryan
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