Tom Van Overbeke wrote:

> I've been (unsuccesfully) looking on the web for information on how long it
> takes to synchronize logical volume copies.
>
>
> i need to migrate data from an ESS -> Symmetrix DMX. san speed is 1 Gb.
> servers are usually p650 or p690 (usually dual processor or 4-processor).
> migration will be done on host level (by adding an lvm copy).
>
> Can someone give me a rought figure about how long it would take per GB, or
> point me to some information on the net so i can calculate myself ?


It depends on a lot of factors.... On the speed of the source storage,
of the target storage, disk configuration, cache size, speed of the san,
number of connections through the san, so, the best way is to make some
kind of test, ideally with lvm sizes several times bigger than the cache
size of the targe system.

BC