|| at Jan 6, 2010 at 5:01 pm
On Wed, Jan 6, 2010 at 5:32 AM, Nagaraj S wrote:
Good Morning All,
I have clarification on rman backup to tape. Suppose if backup team
increase the netbackup streams from 2 to 8, will it decrease the database
backup completion time window? And also how to make changes on rman script
to configure the new streams build by backup team and how rman can
communicate to backup each stream data�s on each tapes separately... Thank
If there are 8 drives available, then it may decrease the time required for
If the network from the server to the tape library doesn't have the
accommodate that much data, then the backups may actually take longer than
with 2 drives.
This is because tapes must be kept streaming to be efficient.
When tape drives run out of data to write, they stop and rewind.
When more data needs to be written, the tape drive must then
seek to where it left of writing.
Here's an article on the topic:http://www.computerworld.com/s/article/93057/Slow_down_those_streaming_tape_drives
Increasing the number of drives in use will also make those drives
unavailable for other backup jobs.
Increasing the number of drives will also increase the number of tapes
that must be vaulted (sent offsite)
The real question is: Did the backup team do their homework when
deciding to increase the number of drives from 2 to 8?
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