I have a question about a client that is using RMAN to backup there Oracle
databse to TSM.
TSM Server:
3.7.3.6 on AIX 4.3.2
We recently changed the backup method for the Oracle databases from going
to disk to going directly to tape. We created a unique nodename for each of
the Oracle DB servers. These servers are in there own domain. When we first
tested this, we saw great results (in terms of speed) to backup the Oracle
DB. However, now when the servers run their backups each night, they are in
a constant Receive Wait and the time to back them up as actually increased.
Currently they are allocating one channel for each backup. The reasoning
behind one channel was that anything other than 1 channel (i.e. 2 channels)
the other one would be in a media wait because of colocation. My question
is, has anyone else seen where a backup like this was in a constant receive
wait when using only on channel? I have a thought, but I am not 100% sure
if it would solve my problem because I am not 100% sure on how RMAN groups
its data. My thought is if you run 2 channels, one will be running and the
other waiting. However, will that second channel already have the data
grouped together and ready to transfer when the other one gets finished?
Let me know if anyone else has seen this. If I need to provide more
infomation, let me know. Thanks for the help.
Regards,
Sean M. English
Distributed Storage Management/TSM
IBM Global Services South, Charlotte, NC
External: (704)594-2232 T/L: 8-794-2232
Pager: (800)946--4646 PIN: 1428698
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