3.7.0 HP StorageWorks HP Scalable NAS File Serving Software administration guide - HP Scalable NAS 3.7 for Linux (AG513-96002, October 2009)

Create the administrative filesystem
The replication feature and the Performance Dashboard require that an administrative
filesystem exist on the cluster. This filesystem can also be used for the mxfs reply
cache, which FS Option uses when the virtualized NFSD RPC reply cache feature is
enabled. The administrative filesystem should be used only for HP Scalable NAS
operations.
NOTE:
The administrative filesystem is preconfigured on HP StorageWorks 4400 Scalable
NAS systems.
IMPORTANT:
Do not use psfssuspend to suspend the administrative filesystem. Doing this can
cause issues with the cluster.
Determine the size for the administrative filesystem
The minimum size for the administrative filesystem is 10GB; however HP recommends
that the filesystem be at least 50GB. If the replication feature is used, you may need
to create a larger filesystem. Use the following formula to determine the space required
for replication.
S = ((4KB * C) * (N+1)) * B
The variables in the formula are as follows:
Space needed for replicationS
Average number of unique changes per replication interval per nodeC
Number of nodes in the clusterN
Backlog; the number of replication intervals (≥1) that replication is behindB
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