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==== How long did the upgrade itself take? ====

The install took about over an hour on the head server (including a format of a 2TB disk, which was where most of the delay was).  We went in cold to the head server and of course there was a typo somewhere and the install failed somewhere near the end.  It was fixable, but we decided not to bother and fixed the installer and ran it again as a lazy option.

The test head server took 18 minutes to reinstall if the RAID arrays were not formatted.

The nodes took about 10-12 minutes total when reinstalled on mass.  Individually, a node takes about 4 minutes to go down and come back up fully reinstalled and FAI lists the install time as two minutes (the rest was rebooting).

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