Unable to unmount or remount temporarily disconnected NFS shares when the NFS server is available
Issue
- Unable to unmount or remount an NFS share after the NFS server has temporarily gone offline
- Unable to unmount or remount an NFS share after the NFS server has performed an online migration to a new underlying filesystem
Environment
- NFS client: Red Hat Enterprise Linux 5.8 with kernel 2.6.18-308.13.1.el5
- NFS server: Hitachi HNAS
- Performing migration operation on NAS where the contents of an export is copied to a new disk, and the export is moved to the new disk
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