steve@wakefieldrfc.freeserve.co.uk (Steve Nottingham) wrote in message news:<42862645.0401070230.6cd7da76@posting.google. com>...
> yls177@hotmail.com (yls177) wrote in message news:<c06e4d68.0401062330.59320ffc@posting.google. com>...
> > hi, just want to find out why flashcopy is so much faster than a
> > backup/restore method?... any directions to any helps
>
> Have you read any of the manuals on the subject ? The ESS (presuming
> you are using ESS) copies the data internally to another LUN, be aware
> it is not an instaneous copy (contrary to what IBM may say) it is a
> background process that takes place in the ESS. Backing up and
> restoring from tape is only as quick as the tape drive and disk to
> disk copy is a lot quicker.
>
> Steve


a LUN will be a group of disks in this case.

okay, so its a background process. then, it will take time but
definitely faster than the traditional backup/restore methods.

finally, the medium chosed will affect the speed as well. from your
last statement, its obvious that disk to disk copy is much faster than
backup/restore. therefore, the disk to disk copy is done by the
background process in ESS

am i right?