If you are doing Point in Time backups for your DR and you want to get
the backups of those copies quickly done, then the V2X2 is your baby.
SnapShot is more friendly in this area than Flashcopy. SnapShot saves
pointers to the current data whereas FlashCopy copies it from one
location to another under the covers. You have to wait for each block
to be dumped to get to the Flashed location before it can be dumped.
Your last statement is not true. When dumping from the Flashed copy,
when the dump accesses a track which has not been copied, the IBM CU
accesses the track from the source disk. No special penalty to be paid.
But it is true that Snapshot is fast. Because of the "log structured"
organization of the STK disks, Snapshot is just a matter of copying
pointers. No data movement at all.
--
Bruce A. Black
Senior Software Developer for FDR
Innovation Data Processing 973-890-7300
personal: [EMAIL PROTECTED]
sales info: [EMAIL PROTECTED]
tech support: [EMAIL PROTECTED]
web: www.innovationdp.fdr.com
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