[Libvir] Disks and NICs
Richard W.M. Jones
rjones at redhat.com
Thu Dec 13 15:39:25 UTC 2007
Katti, Vadiraj (STSD-Openview) wrote:
> Hi,
> Libvirt provides the disk and Network interfaces statistics for each
> of the guests configured. Is there a api which tells me how many disk
> and network interface are configured per guest so that can make the
> corrosponding calls to get the statistics of each the disk/nic (like
> virDomainBlockStats and virDomainInterfaceStats).
In addition to DV's answer, this is how it's done in virt-top:
http://hg.et.redhat.com/virt/applications/virt-top--devel?f=31e1a2bb21e4;file=virt-top/virt_top_xml.ml
(It'd be a lot easier if I'd had an XML library available with XPath
support...)
If you want some C code which does this using libxml2 and XPath, then
take a look at my virtstats module in the collectd source
(http://collectd.org/).
Because trawling through the XML is rather inefficient, virt-top only
does it once for each new domain it sees, so if interfaces are added or
removed then you have to restart virt-top. For collectd it rechecks the
XML every 60 seconds IIRC.
Rich.
--
Emerging Technologies, Red Hat - http://et.redhat.com/~rjones/
Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod
Street, Windsor, Berkshire, SL4 1TE, United Kingdom. Registered in
England and Wales under Company Registration No. 03798903
-------------- next part --------------
A non-text attachment was scrubbed...
Name: smime.p7s
Type: application/x-pkcs7-signature
Size: 3237 bytes
Desc: S/MIME Cryptographic Signature
URL: <http://listman.redhat.com/archives/libvir-list/attachments/20071213/bf36f4db/attachment-0001.bin>
More information about the libvir-list
mailing list