Thursday, March 21, 2013

Cisco UCS lsmod on VIC

A UCS blade's most popular daughter card is a VIC which can provide both Fibre and Ethernet connectivity. Support for this hardware is in a vanilla RHEL6 Linux kernel and a screen cap of running lsmod and modinfo on a machine with this hardware is below. This hardware allows you to present virtual Ethernet or HBAs directly to a virtual machine on RHEV. Cisco's name for this is VM-FEX and RedHat has benchmarks on VM-FEX and KVM performance.



Update: Cisco has documentation on Configuring VM-FEX for KVM.

Tuesday, March 19, 2013

Tried UCS in a Lab

I got to try Cisco UCS in a lab environment yesterday. So far I like it more than my Dells. You can SSH into either fabric interconnect and find NX-OS running:

and use NX-OS to display information about your servers:

The GUI lets you copy information about any object including its XML:

Tuesday, March 12, 2013

querying sip SRV records

box:~ dude$ nslookup
> set q=srv
> _sip._udp.colab.sipfoundry.com
Server:  141.133.112.120
Address: 141.133.112.120#53

Non-authoritative answer:
*** Can't find _sip._udp.colab.sipfoundry.com: No answer

Authoritative answers can be found from:
_sip._udp.colab.sipfoundry.com
 origin = ns1.sedoparking.com
 mail addr = hostmaster.sedo.de
 serial = 2007021501
 refresh = 86400
 retry = 10800
 expire = 604800
 minimum = 86400
> 
> _sip._udp.sip.redhat.com
Server:  141.133.112.120
Address: 141.133.112.120#53

Non-authoritative answer:
_sip._udp.sip.redhat.com service = 3 0 5060 sipx-sbc03.geo.redhat.com.
_sip._udp.sip.redhat.com service = 4 0 5060 sipx-sbc04.geo.redhat.com.
_sip._udp.sip.redhat.com service = 1 0 5060 sipx-sbc01.geo.redhat.com.
_sip._udp.sip.redhat.com service = 1 0 5060 sipx-sbc02.geo.redhat.com.
_sip._udp.sip.redhat.com service = 2 0 5060 sipx-sbc03.geo.redhat.com.

Authoritative answers can be found from:
> _sip._udp.sbc.lafayette.edu
Server:  141.133.112.120
Address: 141.133.112.120#53

** server can't find _sip._udp.sbc.lafayette.edu: NXDOMAIN
> ^D 
box:~ dude$