Hello,

I'm running backups on Informix7 DBs. We're able to stream the DB 
backups using parallelism 4 and get good throughput (100MB/s, yes 
megabytes/sec, it is a SAN Media Server). A 300Gig DB takes less than 1 
hour.

However (I know ;)), when it backs up the LOGS (all backups go to tape, 
I don't have Disk backups), each log comes in as a separate request. 
Each log is therefore a separate job. So the time taken to process this 
request is greater than the time to backup each log. ie each log is 
100MB and the time taken is <2secs (when the resource is allocted and 
ready), but it takes 1+min to create the job/assign the resource/and 
begin writing. This is resulting in my never being able to catch up with 
the rate of logs generation although the amount to be backed up is 
minimal eg 30logs is just 3Gig, but takes approx 30mins and by that time 
10 more logs are created. I am using media_unmount_delay so the tapes 
are not re-mounting for every request.

I cannot increase the size of the LOGS as this would affect replication 
and recoverability (double whammy). This is Symantec's recommendation.

I'm looking for experiences that people have had to speed up the 
Informix backups.

Thanks.

-- 

Larry Mascarenhas
LMascare AT comcast DOT net
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