Need a Spectrum Scale filesystem Maintenance mode (JUMP Trading LLC)

Currently, Spectrum Scale does not have a maintenance mode that can disable operations at the cluster or file system level. This is especially true for large multi cluster configurations that span
multiple sites, where maintenance on the storage cluster can be
interrupted by commands run on the remote cluster(s). These
interruptions can lead to hangs and NSD down situations.

We need a way to:

1. Disable file system mounts to keep remote clusters from
mounting while maintenance is occurring".



2. Start up a NSD Server Cluster, confirm all nodes
are active in GPFS, and then administratively allow nodes
to mount file systems, preferably on a per file system basis.
For example if one set of NSD servers has issues this would
allow us to put other file systems in the same NSD Server
Cluster into production



3. Disable file system access before shutting down NSD cluster
so that disks are not marked down in file systems during the
shutdown


The implementation of a maintenance mode can be used to simplify maintenance and reconfiguration tasks. This mode would be used to disable operations that would interrupt or might be adversely affected by the maintenance or reconfiguration tasks. If a cluster or filesystem was in maintenance mode, specific operations would be prevented to avoid disruption until the maintenance mode was turned off.