HP P2000 HP StorageWorks P2000 G3 FC and FC/iSCSI MSA Controller Firmware Rele - Page 22

Issue: Using a long IQN name for iSCSI initiators may lead to issues while using SCSI-3 reservations and Persistent Group Reservations, particularly when trying to create large clusters with multiple paths to each LUN. A predefined area is used to store SCSI-3 reservation keys for each initiator path to each LUN and, when a large number of IQN entries are attempted to be stored, the array can run out of space in this area. This issue is dependent on the number of nodes and the number of paths per node accessing individual LUNs. This issue has been seen during the cluster validation process on Windows 2008 R2 clusters with 16 nodes, where each node had 4 paths to each LUN of the array. Workaround: Shorten the IQN name on the nodes. The following formula is used to calculate the maximum IQN name length based on the number of cluster nodes and the number of paths from each node to a LUN on the array: Maximum IQN Character Length = [3840 / (n * p)] - 16 (Where n = number of cluster nodes and p = number of paths per cluster node.) NOTE: By specification, 223 is the maximum IQN length allowed. The following table provides the calculated values based on the number of cluster nodes and the number of paths from each node to LUN on the array. 1 2 3 4 5 6 Number of 7 cluster nodes 8 9 10 11 12 13 14 15 16 Maximum IQN Character Length Number of paths per cluster node 1 2 3 4 5 6 7 8 223 223 223 223 223 223 223 223 223 223 223 223 223 223 223 223 223 223 223 223 223 197 166 144 223 223 223 223 176 144 121 104 223 223 223 176 137 112 93 80 223 223 197 144 112 90 75 64 223 223 166 121 93 75 62 52 223 223 144 104 80 64 52 44 223 197 126 90 69 55 44 37 223 176 112 80 60 48 38 32 223 158 100 71 53 42 33 27 223 144 90 64 48 37 29 24 223 131 82 57 43 33 26 20 223 121 75 52 38 29 23 18 223 112 69 48 35 26 20 16 223 104 64 44 32 24 18 14 22