'Device is not ready' error message appears when trying to use the search function. (4237495)

'Device is not ready' error message appears when trying to use the search function.

When users try to use the search function in the Archive Manager WebUI, a "Device is not ready" error message is returned.

Environment Details:
Archive Manager 4.7.1 Windows 2008 R2 Virtual 4 vCPUs and 16Gb RAM.
SQL 2008 Windows 2008 R2 Virtual 4 vCPUs and 16Gb RAM.
Web Server Windows 2008 R2 Virtual 4vCPUs and 4Gb RAM.
Exchange Server Exchange 2010 SP1 RU5 Windows 2008 R2 Virtual 4 vCPUs and 16Gb RAM.
All Exchange servers are virtual with NetApp disks attached via SnapDrive.
Moderate to high usage for 1000 users.

There is a possibility that the hard drives from Archive Manager and SQL Servers were very busy at that point in time and/or Archive Manager and SQL Servers are under spec’d for the amount of work that needed to be carried out.
Rebooting the Archive Manager in a quiet time to refresh connectivity and any memory leaks does help, but not in this instance.