Veritas-bu

[Veritas-bu] massive catalog growth

2011-11-14 11:28:59
Subject: [Veritas-bu] massive catalog growth
From: "Sanders, Nate" <sandersn AT dmotorworks DOT com>
To: "VERITAS-BU AT mailman.eng.auburn DOT edu" <VERITAS-BU AT mailman.eng.auburn DOT edu>
Date: Mon, 14 Nov 2011 10:28:51 -0600

As of a few weeks ago we saw our NBU7 catalog explode from 80GB to a peak of 238GB. My initial belief was this was part of us standing up a 2nd media server for the office which was linked to a Data Domain 630. But after reviewing the historical graphs, it is very clear this increase happened just a couple weeks ago. The obvious thing I started doing 2 weeks ago, is backing up our new Isilon cluster and also introduced these backups to a new Data Domain 670. More specifically, our Isilon which contains around 600 million image files that are less than 128k each.

 

How in the world could 10TB of image data suddenly cause the catalog to triple in size? Yet previously adding 18TB of data from a new media server (the dd630) didn’t even cause more than a 20GB increase in the catalog ?

 

I’m at quite a loss here to understand how this increase happened so quickly. The real issue here is that the catalog filesystem has filled up 3 times, causing nbpem to crash, and backups to grind to a halt. The last time this happened had nothing to do with the Isilon backups, but happened as a result of changing the media destination from some existing OS backups to go to a Data Domain 670, instead of their old DSSU locations. The isilon also points to this same DD670. Could that be the real issue here? Is there something different about how the catalog stores information when it resides on a Data Domain?

 

--
Nate Sanders            Sr. System Administrator
Digital Motorworks, Inc         (512) 692 - 1038

 


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