HP Cisco MDS 9020 - Fabric Switch Configuration Manual page 1199

Chapter 49 Configuring SANTap
S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m
Figure 49-2
MDS
SAN 1
You can use SANTap to remove your appliance-based storage applications from the primary data path
in your SAN. Removing these applications from the primary data path prevents them from
compromising the security, availability, and performance of your SAN. SANTap copies the data at line
speed and makes it available to other storage applications; these storage applications are prevented from
affecting your SAN while maintaining the integrity of the data the storage applications need.
Dynamic LUN is a feature introduced in the Cisco SAN OS release 3.2(1). When one or more LUNs are
removed or added on the backend target during the periodic scan, SANTap automatically uninstalls the
deleted DVT LUNs and installs any additional LUNs. Uninstallation of the deleted DVT LUNs is done
even if the total number of LUNs remains the same.
In previous releases, when the set of LUNs changed on the target, the original LUN list was displayed
on the DVT. The new and changed LUNs were not reflected on the DVT. However, if the total number
of LUNs increased, then the additional LUNs were installed and displayed on the host.
Prior to Cisco SAN OS release 3.2(1), a user had the following options for displaying the LUN list on
DVT:
• Shut the host interface- Purge the DVT LUNs for the IT pair using CLI. All the LUNs for the existing
IT pair were removed, and the correct set of LUNs was recreated when the host logs in.
• Reload the SSM- Works only if there are no sessions and AVT LUNs present.
64-Bit LUN Support- In Cisco SAN OS release 3.2(1) or later releases, SANTap supports 64-bit LUNs
on the target.
The following CLI commands are used to obtain the mapping between the host-side LUN and the
target-side LUN:
Switch# show santap module <num> dvtlun
Switch# show santap module <num> dvtlun brief
Module# show santap vttbl dvt <dvt_wwn> host <host_wwn>
OL-16184-01, Cisco MDS SAN-OS Release 3.x
SANTap Proxy Mode-2 Example
Host initiators
VSAN-1
D V T
with SANTap
VSAN-2
VSAN-20
Target
VSAN-10
SSM
D V T
capability
Appliance
Cisco MDS 9000 Family CLI Configuration Guide
About SANTap
MDS
SAN 2
49-3