3PAR InForm OS 2.3.1 Upgrade Pre-Planning Guide

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InForm OS Version 2.3.1 Release 2.3.1 Upgrade Pre-Planning Guide
The recovery of the I/O paths must be monitored at each individual Sun Cluster node. Status of
the Sun Cluster I/O paths cannot be assessed from the InServ Storage Server. On each individual
Sun Cluster node the command mpathadm list lu is run, and the output is analyzed to see
that all paths to all devices are enabled. Identifying all paths as enabled is accomplished by
noting that “Operational Path Count:” equals “Total Path Count:” for all devices in the “list”.
The command mpathadm list lu outputs the current path status. Running the command
multiple times on each Sun Cluster node may be necessary in order to monitor the paths as
they come up. The upgrade should be paused until “Operational Path Count” matches “Total
Path Count” in the mpathadm list lu output for all devices on all Sun Cluster nodes. Note
that the pause time necessary may be many minutes, depending on the number of host cluster
nodes, I/O paths, and devices.
■ Sample output; in this case all paths are up:
■ Sample output; in this case all paths are not up:
7.0 Exanet ExaStore Clustered NAS System Prerequisites
There are special procedures that will need to be performed on an Exanet ExaStore v4.0.x
Clustered NAS system when a 3PAR InForm OS update needs to take place. In the standard
ExaStore configuration, NAS clients that connect to the ExaStore might experience excessive
periods of I/O quiescence during the InForm OS upgrade. Contact Exanet for details on
obtaining this script as well as specific usage instructions. An overview of the process is
included for quick reference:
# mpathadm list lu
/dev/rdsk/c4t50002AC0003200D8d0s2
Total Path Count: 4
Operational Path Count: 4
NOTE: Only two of four paths are up in the output below, continue to “wait”
until Total Path Count equals Operational Path Count.
/dev/rdsk/c4t50002AC0003100D8d0s2
Total Path Count: 4
Operational Path Count: 2