Starr, Alan pisze:
Hello List,
I was just asked to come up with statistics that describe the rate of DASD data changed
> (during some yet-to-be-determined period) so that we can calculate
the bandwidth required to
transmit the necessary (mirrored) data. The DASD hardware is HDS. I suppose that it's not necessary
> to pinpoint the changes down to the dataset or volume; if I can just
get a number of bytes changed
> per period of time per subsystem, that should do.
I've just started to peruse IBM manuals and redbooks but I'm wondering if any
of you could point me to helpful tools.
IMHO you should start with the type of the copy. Synchronous vs
Asynchronous. This is crucial.
Second, you should be aware, that number of bytes per (relatively long)
period of time is irrelevant, especially for Synch. copy (TrueCopy Sync
in your case). What is important is the peak value. Then you can start
measurements
...and finally you should use at least 4 FC links, as fast as possible ;-)))
BTW: I bet the most valuable data you can get from DASD array tools
directly. Some PC (+application) connected to the DASDbox. I can't
remember HDS's name for that, in case of EMC it's ECC.
--
Radoslaw Skorupka
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