Bill McGonigle wrote:
> Thanks for the heads up - much appreciated.
>
> On Jun 4, 2008, at 10:55, Luke Scharf wrote:
>
>> The system would grind to a halt every few hours when running a
>> number of DomUs.
>
> My initial plan was to run a single DomU with /boot on a disk image
> and NFS for everything else (this is how I was going to get ZFS on
> linux!) - I wonder if that'll fare any better.
If you have two separate boxes, I suspect you won't run into the problem
I found. My feel is that the problem would not appear if you configured
your system with one box for ZFS and a separate box for Xen (possibly a
Linux box), with NFS running between them.
>> I added a few parameters to the Xen kernel and also to ZFS
>> (recommended on the Sun xVM listserv) to keep them from fighting over
>> the memory,
>
> Do you think your situation was one of not really having enough RAM to
> accomplish the goal, or was it more like no matter how much RAM you
> had, the resource allocation scheme wasn't going to work out?
I believe that it was the latter. My hardware is a dual-core AMD AM2
CPU with 2GB of RAM. My DomU's were using about 900mb of RAM at the
time, which left my Dom0 with well over a gigabyte to work with. My
disk drive setup was nothing special -- a pair of 160GB ZFS-mirrored
disks for the system, and 3 PATA 250GB disks configured in a raidz for
the data.
The tweaks that I applied were those suggested in this thread from
OpenSolaris xen-discuss:
http://opensolaris.org/jive/thread.jspa?messageID=239372𺜌
I also had to do an eeprom tweak in order for my Promise ATA controllers
to be recognized.
> It follows then to examine whether this affects all OpenSolaris xVM's,
> or if there's a unique Nexenta bug to be filed. I filed one yesterday
> about needing Xen 3.1 bits for 1.0.1, but didn't see this kind of bug
> on Launchpad.
I would have loved to explore the issue further, but my home mail-server
needs to work. I'm in the process of moving and changing jobs, so I
need a reliable e-mail server that can follow me is a priority.... When
the dust settles, I'll be able to resume mucking around, but with my
backup server.
-Luke
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