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12-3
Cisco MDS 9000 Family Troubleshooting Guide, Release 3.x
OL-9285-05
Chapter 12 Troubleshooting SAN Device Virtualization
SDV Issues
• You cannot specify the same primary device for different virtual devices.
• SDV works in a hard zoning environment only. (Hard zoning is enforced using ACLs that are applied
by the switch port ASIC to every Fibre Channel frame that is switched; hard zoning is also referred
to as port zoning.) SDV does not work in the default zone, even if you set it to permit.
• The real device-virtual device zone cannot coexist with the real device-real device zone. If the real
devices are not already zoned together, then you can configure the real device-virtual device zone
with no negative impact. If these devices are already zoned, then adding the real device-virtual
device zone may cause the zone activation to fail. If this occurs, then you must delete one of the
zones before activation.
• There must be at least one rewrite-capable SDV-enabled MDS switch located between the server and
the target that is being virtualized. The Cisco MDS 9124 Fabric Switch is not a rewrite-capable
switch.
In other words, SDV does not work when real devices and primary virtual devices are connected to
the same Cisco MDS 9124 Fabric Switch.
Caution When restoring a configuration file from an ASCII file (for example, when you issue the copy
bootflash:saved-config running-config command), ensure that the pWWNs in the device alias
configuration portion of the file are consistent with the current fabric state. If pWWNs in the saved
configuration file do not match the current fabric state, then it can result in inconsistencies and merge
failures of SDV (which can occur if the file being used to restore the configuration was saved at some
earlier point, and subsequent changes have been made to the device alias database). If this occurs, edit
the saved configuration file to make the device-alias pWWNs consistent with the device aliases currently
used in the fabric.
SDV Issues
This section describes potential problems associated with SDV, and includes the following topics:
• SDV Commit Fails, page 12-3
• SDV Commit Partially Fails, page 12-4Host Cannot Locate Disk, page 12-5
• SDV Merge Fails When ISL Comes Up, page 12-6
• Zone Activation Fails in a SDV Zone, page 12-6
SDV Commit Fails
Table 12-2 describes measures to take when an SDV commit fails.
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