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Is there an official paper from Microsoft on how often to do defrag and SFC on SBS 2003?

Having loads of problems with LaCerte on sbs 2003 R2 and lacerte is asking if we defragged or run sfc at all or regularly.  I said no to both.

Am I wrong?  I asked them for their best practices recommendation and they said it's a microsoft issue and MS says monthly?!  

We run shadow protect for backup so that will cause huge backups every month after a defrag.  I thought the need for defrag has gone away?  

And SFC?  I never heard to run that routinely.

as for checking the hard disks (it's a RAID array), I posted that question here:

https://www.experts-exchange.com/questions/26616643/Checking-hard-drive-integrity-of-a-RAID-5-partition-on-a-dell-server-with-Perc-6-i-controller-card.html
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on a raid5, its my understanding that the files aren't actually moved into contiguous pieces on the disk as the pieces are physically split anyway.
it does provide a slight help with the logical storage and can reduce directory entries, speeding up that part of access.
The defrag acts on the file-system and has nothing to do with single disks or a raid array, so that is irrelevant, a defrag is still useful.
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thanks guys, but does microsoft have a best practices recommendation for defrag?  I think it was Win NT (remember that!?) that didn't even come with a defrag app.

I have a LOB tech support saying we should have been defragging more often (we're not doing it at all) and making me look bad in front of the client.  When I asked him  how often they recommend, he said it's an OS issue and leave that up to Microsoft, which he thinks is monthly.  

So the client's on the phone with us with a problem with the LOB app not installing reliably.  The LOB tech gets things working so he looks like the hero and making me look to the client like I'm slacking.  Would like to have some ammo that microsoft doesn't have a recommendation or at least certainly not monthly.  My money is that it's the LOB and its bloat.  But I won't get the LOB tech to acknowledge that!
gheist - sorry I missed your comments - do you have a URL you can link that weekly claim to?

and again, running an imaging app (shadow protect) would get beat up if you run defrag often - it'll think that lots of the hard drive changed each incremental and it'll be a huge.
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