Legacy HDS Forums

A CoW question?. or two

Discussion created by Legacy HDS Forums on Aug 9, 2007
Latest reply on Aug 14, 2007 by Legacy HDS Forums

Originally posted by: mackem



Got a couple of questions re COW snapshots on a USP ?

When a write comes in for a snapped volume does that write hit cache and sit in cache like normal to be destaged asynchronously?

How is the old (original) data written out to the pool?  Is this an asynchronous operation or does the original data have to be written and confirmed to the pool before the update can be written to the PVOL (and acked back to the host).

Does it work the same with internal and external disk (with the exception of verify after write for SATA)?

Many thanks!

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