Let me expand on that: Given those files are probably large, IO will tank to that drive and given that Exchange doesn't like "waiting" long periods for IO to its DB your bound to see errors on the logs and disconnected users until this very long process completes.
If you feel you must, dismount the store then do it. FWIW as Michael suggested, it probably wont help. I recently had some issues with a ~20G DB and it was badly fragmented so I scripted a dismount, defrag and remount which took several hours at night. It looked pretty, but didn't do a dang thing for performance. jlc From: Michael B. Smith [mailto:[EMAIL PROTECTED] Sent: Thursday, August 28, 2008 2:55 PM To: NT System Admin Issues Subject: RE: Defrag clarification Bad? Not with a modern defrag program. But I would assert that it provides no value whatsoever (on modern drives). Regards, Michael B. Smith MCITP:SA,EMA/MCSE/Exchange MVP http://TheEssentialExchange.com From: Joe Heaton [mailto:[EMAIL PROTECTED] Sent: Thursday, August 28, 2008 4:52 PM To: NT System Admin Issues Subject: Defrag clarification Defragging the drive that holds your Exchange databases is a bad thing, right? Pretty sure I've heard that before... Joe Heaton AISA Employment Training Panel 1100 J Street, 4th Floor Sacramento, CA 95814 (916) 327-5276 [EMAIL PROTECTED] ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~
