Stop the SMS Services when performing disk maintenance...
If you ever need to perform any sort of disk maintenance on your Site Servers it’s always a good idea to stop the SMS Services BEFORE doing so as demonstrated by one user who decided to extend the drive on their SAN containing the Site Database of their
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Read the complete post at http://myitforum.com/cs2/blogs/chobbs/archive/2007/05/15/stop-the-sms-services-when-performing-disk-maintenance.aspx