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Disconnecting an iscsi device in windows

Paul Sweeney · 17th January 2021

quicktips iscsi windows

To successfully disconnect an iscsi-mounted device in windows…

In disk manager, in lower portion of screen, right-click on the disk itself (on the left hand side, not the partitions on the right), and select Offline
in the iSCSI Initiator app:
- in the Favourite Targets tab, select the item and choose Remove
- in the Targets tab select the item and click Disconnect
This may fail e.g. with the message:

The session cannot be logged out since a device on that session is currently being used.

if so, this may be due to windows Task Manager running which, if disk performance counters are enabled, holds the device open.
- Close all open task manager instances
- If disk performance counters are not required, to prevent this happening again, at an administrator powershell/command prompt, issue diskperf -N

Thanks

Useful info about task manager/performance counters was found here