Your initial performance may be misleading because it could be buffered data.

I would make sure your tuning is in order; and then I would start investigating 
how the data is getting to the VTL...ethernet or fibre...what is the hardware 
in between...we ourselves in one instance discovered a 10 G NIC used by an IBM 
frame that had a performance bug...a 1 TB backup was taking like 5 hours! Now 
we have it down to 52 minutes.

...so crazy things can happen.

-----Original Message-----
From: veritas-bu-bounces AT mailman.eng.auburn DOT edu 
[mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of 
NetCookingTalk
Sent: Monday, June 20, 2011 8:14 AM
To: VERITAS-BU AT MAILMAN.ENG.AUBURN DOT EDU
Subject: [Veritas-bu] Netbackup to VTL fast with first tape then slow thereafter

post from Nathan:
Thanks, when I checked the bptm logs I can see the throughput but no indicator 
as to why the second tape crawls.

Nathan 
============

I've seen some of my jobs start out good and slow to a crawl later.  I had not 
cosidered that it might have changed tape in the process.  I will see if that 
is the case on my end and will be very interested in the solution to this 
issue.  

Greg

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