Hang when importing pool

[Karli Sjöberg]

31 jul 2012 kl. 15.33 skrev Bob Friesenhahn:

On Tue, 31 Jul 2012, Karli Sjöberg wrote:

Hi,

I´m really struggling with this. I have had a pool with imported
filesystems from a Solaris system that had dedup activated. Then,
when the time came to erase them, it just stalled. When rebooting,
it stalled again at mounting filesystems, and since then, I´ve
installed two USB drives to act as root pool with
FreeBSD-9.0-RELEASE so that I could import the original pool in
recovery, but it always stalls after a couple of hours. Looking at
top, I could see that the 16GB RAM was maxed out, so I have heavily
tuned down kmem, arc, etc:

I think that you will need to find some way to temporarily add a
dedicated L2ARC device (preferably an SSD or maybe iSCSI to a LUN on a
machine with huge memory) or to find a machine with a lot more RAM.

I already had a cache device added to the pool I wanted to import, but now I understand it needed to be on the pool that was doing the actual importing, so I delete the one, big partition and split it into three. So the pool I want to have imported has a 32G partition, which it has added as L2ARC. The pool that´s doing the importing has a 32G part added as swap, and the remaining 160G added as L2ARC. From a Vertex 3 240G MLC I know performance of the SSD isn´t an issue.


Bob
--
Bob Friesenhahn
bfriesen at simple.dallas.tx.us<mailto:bfriesen at simple.dallas.tx.us>, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/



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Karli Sjöberg
Swedish University of Agricultural Sciences
Box 7079 (Visiting Address Kronåsvägen 8)
S-750 07 Uppsala, Sweden
Phone:  +46-(0)18-67 15 66
karli.sjoberg at slu.se<mailto:karli.sjoberg at adm.slu.se>