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Thanks Curtis,
I generally do not dup while I am
backing up, other than images under 128k. (another important discussion)
The
backups run at night to DSU, 1900-0600 and the duplication jobs run during the
day 0800-1600.
There are often a handful of network
clients that are still running jobs into the morning when the duplication
starts.
The typical reasons are, the NIC has switched to half duplex, or
storage was added to the host that night.
If I was using VTL for network
backups, these few clients would impact duplication because their virtual tapes
are still in use.
A smaller media size does mitigate
this but does not eliminate the problem and creates a higher media count.
As to the other question, I use
bpduplicate instead of direct export on my
VTLs.
Here are a few of my reasons:
-highest media compression
-higher degree of confidence in
restoreability from physical tape
-prioritization of images that need to be duplicated
first
-All versions of NBU, and brands of VTL and libraries support
this duplication configuration
-imageDB is aware of all image copies. I use
that to report the RTE of an application based on the different risk scenarios.
(Restore from VTL or restore from tape, the current location of that
tape)
__________________________________________
Jonathan Marianu
(mah ree ah' nu)
AT&T Storage Planning and Design Architect
(360)
597-6896
Work Hours 0800-1800 PST M-F
Manager: Jim Taylor
(dt3249)
(678) 893-3170
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