Xen users - Jun 2006 - Device 0 (vif) could not be connected

Hi all,
The config file suddenly stopped working.
Did a sanity check: brctl exists in the path

Myconfig file has 
disk = [ ''file:/test.img,ioemu:hda1,w'',
''file:/test2.img,ioemu:hdb1,w'']
and the images have the fstab set for /dev/hda1 and /dev/hdb1

/var/log/xend.log shows
DEBUG (blkif:24) exception looking up device number for hda1: [Errno 2] No such
file or directory: ''/dev/hda1''[2006-06-16 17:21:44 xend]
DEBUG (blkif:24) exception looking up device number for hdb1: [Errno 2] No such
file or directory: ''/dev/hdb1''

What could be wrong? The file images exists and I can mount them on loopback. 
Please help
Thanks
P. krishna

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Hi.

So, I''ve seen this asked a few times, but haven''t found a
decent answer yet.

How do you track your server utilization for your Xen servers?

"sar" and "top" don''t seem to see any of the
utilization by the guests
(when run in Dom0).

"xm top" shows some good stuff, but I don''t see any good way
to record
it (ala "sar") for later perusal, graphing, analysis, etc.

How are people monitoring their servers so they know when they''ve run 
out of juice???

We have just put together a Xen "cluster" with a pair of identical Xen
servers and the guest disks kept in sync via DRBD and some Linux-HA glue 
for migrating clients.  So far, it seems to be running, but since I 
can''t get any good performance data, it''s hard to see what
needs to be
tuned.

Thanks!
Sam

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> "xm top" shows some good stuff, but I don''t see any good
way to record
> it (ala "sar") for later perusal, graphing, analysis, etc.
>
> How are people monitoring their servers so they know when they''ve
run
> out of juice???
>
Even prior to getting started with Xen, I have been using and
advocating the use of Ganglia:

http://ganglia.sourceforge.net/

The great thing about Ganglia and Xen is that Ganglia relies on
multicast which makes for detection of new Xen domUs as they are added
without requiring and pre-configured list of services to monitor.
Take a look at the project and see if it meets your needs.  I will say
I have done extensive testing of Ganglia in a Xen environment and
found it worked flawlessly.

Any questions, just ask.

-D

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