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We just updated our DR system last week. First we took the HMC from 4.5 to 6.1 in one shot. No intermediate upgrade to 5.x required. This took a few hours as it included fixing a problem we had, backing up the HMC, doing the upgrade (more of a reinstall) and then backing up again. Then we took the iSeries firmware from what shipped in the machine back in Oct 05 to the current release (240 IIRC) again in one shot. Took about an hour total including power off, firmware update, and IPL. This was on a 'small' 570. The only iSeries downtime was for the firmware install.
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