WP8572 h1tw0 raw minute data offload

TJ, Dave:

With H1 out-of-lock, I have started the h1tw0 offloading process. I have switched the active /trend/minute_raw to an empty directory set at 12:35 PDT, its data epoch is 12:39PDT. The data directory with the last 8 months of data was named /trend/minute_raw_1268768058.

h1tw0's minute trend data is served by h1nds0. The only NDS client of h1nds0 is the guardian system. Looking at the guardian user code and speaking with TJ, we think the only guardian NDS requests are for full data (taking averages over time periods from 1 to 10 seconds). Therefore I am not going to restart h1nds0 to serve recent minute-trend data from the temporary location /trend/minute_raw_1268768058 since restarting h1nds0 will have a greater impact on guardian than the loss of the last 8 months of raw minute trends.

I'm preparing h1fw0 to start the copy of the minute-raw files from h1tw0 to their final archival location on h1ldasgw0 compressed ZFS raid. The copy is expected to take the whole weekend to complete.