Perhaps we should put this on libvirt-list(a)redhat.com?
On 08/17/2011 12:46 PM, Gareth S Bestor wrote:
We're looking at a problem when we have a libvirt pool defined, below
[root@xnl2192 ~]# virsh pool-dumpxml ScsiPool-host2
<pool type='scsi'>
<name>ScsiPool-host2</name>
<uuid>f2ea1882-881f-9f49-838d-39e070f68002</uuid>
<capacity>136583315456</capacity>
<allocation>136583315456</allocation>
<available>0</available>
<source>
<adapter name='host2'/>
</source>
<target>
<path>/dev/disk/by-id</path>
<permissions>
<mode>0700</mode>
<owner>-1</owner>
<group>-1</group>
</permissions>
</target>
</pool>
As you can see, this pool maps to /dev/disk/by-id. There may be a large
number of actual volume entries in /dev/disk/by-id, however it appears
only a distinct subset of them are actually added into the libvirt pool
when you do a pool-refresh. What does libvirt check when determining
which, and whether or not, to add one of these volume into the vol-list?
In particular, we have a case when one specific volume in
/dev/disk/by-id is *not* added into the pool, and no amount of
pool-refresh makes a difference. We did notice that if you remove all
the sym links in /dev/disk/by-id and do a pool-refresh, that libvirt
re-scans the bus, recreates the links in /dev/disk/by-id, and adds (some
of) the volumes back into the vol-list. But not this one problematic
vol, so clearly there is something about this vol that libvirt doesnt
like and why it is (deliberately?) not added to the pool.
What checks, etc does libvirt make against vols when determining whether
to add them to a pool?
- G
Dr. Gareth S. Bestor
IBM Senior Software Engineer
Systems & Technology Group - Systems Management Standards
971-285-6375 (mobile)
bestor(a)us.ibm.com
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Chip Vincent
Open Virtualization
IBM Linux Technology Center
cvincent(a)linux.vnet.ibm.com