HP SureStore E SAN Manager LUN Management Administrator's Guide

154 Microsoft Cluster Server (MSCS)
Microsoft Cluster Server (MSCS)
The following information may be helpful when running SAN Manager LM with MSCS:
• Use only Windows NT-partitioned (not UPM) storage as the quorum disk.
• Use of a UPM logical device as the quorum disk is untested. SAN Manager LM
encounters problems discovering logical devices if the physical devices are reserved
by another host in the cluster.
• When repartitioning a device that is on the same virtual bus as the quorum disk, all
partitions on the disk may become inaccessible when you commit the changes in Disk
Administrator. To access the device, reboot the host that did the repartitioning.
• When a Microsoft Cluster Server host is reserving a storage device, the SAN Manager
LM administration application may not display the partitioned device icon badge
because the reservation of the device prevents SAN Manager LM from reading the
device.
• If the quorum disk is not an active resource on a cluster host, Cluster Disk (the MSCS
disk filter) prevents that host from seeing the disk in Disk Administrator.
• Cluster Server may not be able to use a disk that is added dynamically to a running host.
In some cases, the host must be rebooted for Cluster Server to begin using the disk. For
example, if the quorum disk is unassigned from a host and assigned to the host again,
Cluster Server will not begin using it until the host has been rebooted.
• Do not attempt to unassign a quorum disk device from a running cluster’s share group.
The device may be successfully unassigned from the host on which it is not active, but
even if the device is reassigned to that host, the Cluster Disk driver on that host will
not attach to the disk. This means that failover from the active host will not work. At
this point, the cluster is degraded until the device is assigned to both hosts and both
hosts are rebooted.