Re: Backup time.

Hi, Reid

In general, you should do the actual raw I/O measure to you system. It depends on what kind of devices you are using, the disk type, the number of controllers as well as others factors. For my site, I am using DLT tape to do backup, with average 800k/s with 3 streams backup in parallel.

Also for some UNIX machine, the export file to disk have physical size limit. e.g. 2G. It also be considered in your CP.

My figures on hand:
DLT 800k/s
Disk 1.5M/s

Regards,
K POON Reid Lai wrote:

> Dear all,
>
> Now I am preparing a capacity planning document and have to estimate the
> worst and average backup time under different backup strategy. E.g.
> export from database to disk and to tape (raw device), or directly to
> tape (file system). Is there any formula I can use to do so? Or is
> there any recommended backup period per each M/G? Thanks a lot.
>
> Reid
>
Received on Fri Sep 11 1998 - 08:35:50 CDT