Dealing with slow lofs performance on opensolaris hosts

I went to update the Nevada image on my jumpstart server today, and noticed that my loopback mount was performing terribly:

                 extended device statistics              
    r/s    w/s   Mr/s   Mw/s wait actv wsvc_t asvc_t  %w  %b device
   11.5    0.0    0.0    0.0  0.0  1.0    0.0   86.5   0  99 lofi1

Ouch! 11 reads per second causes the loopback device to become 100% busy. It turns out this is bug #6806627, which is fixed in Nevada build 112. I got around the issue by using a Linux host to copy the CD contents, and then running setup_install_server from that location. Now I should be able to live upgrade the host to something a bit more current.

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