HP Windows Server 2012 Cluster Pre-Planning Guide

The Number of Paths per Cluster Node
Microsoft Failover Clustering may send multiple registrations to a LUN, depending on the resource
type, number of paths, and number of hosts. Due to this behavior, the maximum number of paths
configured to a LUN is directly related to the number of registrations supported per LUN or port.
Clustering disk resources will reserve exclusive access to the LUN and will register only the paths
of the owning node. The following equation can be used to calculate the number of registrations
per LUN or port for a cluster disk resource:
Clustering shared volumes will reserve shared access to the LUN by registering the paths of all the
nodes in the cluster. The following equation can be used to calculate the number of registrations
per LUN or port for a cluster shared volume:
Table 2 SCSI-3 Registration Capabilities per Storage Array
SCSI-3 RegistrationsHP Storage
128 per LUN up to 1024 per systemHP P2000 G3 MSA Array Systems
128 per LUN up to 1024 per systemHP MSA2000 G2
128 per LUN up to 1024 per systemHP MSA 2040 Storage
FC: 128 per port per LUN up to 1024 per LUNHP EVA P6000 Storage
iSCSI: 32 per LUN up to 4096 per array
iSCSI/FCoE: 32 per LUN up to 4096 per array
128 per port per LUN up to 1024 per LUNHP EVA 4400/6400/8400
2048 per CHA port
1
HP XP P9000 Storage
(70-04-52-00/00 or greater)
128 per CHA portHP XP 20000/XP24000
128 per LUNHP 3PAR StoreServ 7000
128 per LUNHP 3PAR StoreServ 10000
128 per LUNHP 3PAR T-Class Storage Systems
HP 3PAR OS 3.1.1 MU2 or later
1
Must enable HMO 61 on host groups that require more than 128 registrations per LUN.
NOTE: When implementing a large failover cluster, it may be necessary to increase the pending
timeout value within the cluster disk properties. This allows the cluster resource more time to fail
over to other cluster nodes. See Microsoft documentation for more details.
All limits are applicable to Fibre Channel host-connect configurations.
See the HP SPOCK website for any required hotfixes:
HP SPOCK
The Number of Paths per Cluster Node 9