Thursday, May 30, 2013
DBMT has a nasty little side-effect
It does however have a nasty little side-effect that comes from running the tool, and that is file fragmentation. In fact the DBMT has the ability to fragment NSF files very very quickly and severely.
To check the effects we took a small test server we have and plotted fragmentation between invocations of the DBMT. Here are the results:
As you can see things get out of hand very quickly, and as we've blogged before this WILL have a performance impact on overall server operations, Domino's I/O and also a negative impact on backups. This is a problem that compounds, it's like gradually putting on weight, the insidious effects might not be immediately apparent but over time your servers and SANS will become sluggish.
We've always said running Defrag.NSF on a server is a good idea, and now with the DBMT it is pretty much a must have if you wish to keep your server in good shape and your backups as efficient as possible. Defrag.NSF WILL prevent server and backup performance from slowly degrading due to the insidious effects of fragmentation and if you use the DBMT you WILL exponentially introduce extensive fragmentation across your nsf files.
So use the DBMT and Defrag.NSF as the perfect partners in your scheduled server maintenance.
More information on Defrag.NSF can be found at Preemptive's web site.
Posted by Adam Osborne at 2:13 PM