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Wednesday, June 18, 2008

Mini Nuclear Reactors

Toshiba is trying to donate a small nuclear reactor to a Alaska town powered by diesel generators.

DOE lists capacity as 10 to 50 MWe.

They have a smaller one that is a 200KW model.

Apparently the neutron reflector design is how they get a sub-critical mass to produce energy. Hence their ability to scale DOWN the size and power production of a nuclear power plant. See Wikipedia entry.


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Friday, June 06, 2008

Checking Network Port Settings on Solaris

Another item of Solaris system administration I can't easily find documented is how to check on Network port settings. At my company and from what I hear other major companies there is a port negotiation problem between Solaris and Cisco equipment. So being able to verify port sets are correct is a very useful piece of knowledge.

This needs to be done as root to get correct results.
Step 1
user@Mach # ifconfig -a
lo0: flags=1000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4> mtu 8232 index 1
inet netmask ff000000
dmfe0: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 2
inet 192.68.79.xx netmask ffffffe0 broadcast 192.68.79.xx
To get the device name dmfe0.

Step 2
user@Mach # /usr/sbin/ndd -get /dev/dmfe0 link_speed
user@Mach # /usr/sbin/ndd -get /dev/dmfe0 link_mode

The link_speed of 100 translates to 100Mbit. And the link_mode of 1 means Full Duplex. If the link_mode had returned 0 it would be half duplex. So this setting is 100Mbit Full Duplex.

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