You occasionally see unexplained longer than normal mount time and/or performance issues on certain SAN volumes.
If OS X detects a problem in the file structure of a volume it may initiate a diagnostic and repair routine called fsck (File System Check). This will run in the background, but may cause longer than normal mount time (especially when mounting in a write mode) and/or sluggish performance of some SAN volumes. This may happen after you have experienced a workstation crash (caused by a power outage, for example), or any time the OS detects a problem in the file structure. If OS X is running fsck on a SAN volume, SANmp may not let you mount or unmount the volume.
To determine if fsck is running, do the following while SANmp has the volume mounted (or while attempting to mount the problematic volume):
1. Launch Activity Monitor (Applications>Utilities>Activity Monitor).
2. In the Monitor menu choose Show Activity Monitor. This window may already be open after you launch the application.
3. In the pop up menu at the top right of the Activity Monitor, choose "All Processes."
4. Under the column Process Name look for "fsck."
5. If you find that fsck is running it is appropriate to allow it to finish running. This may take a few minutes or a couple hours depending on the size of the volume.
Edited by Eric Newbauer, 30 July 2010 - 04:43 PM.