Definitions; Limitations - Cisco 9134 - MDS Multilayer Fabric Switch Troubleshooting Manual

Definitions

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
Definitions
Table
Table 23-1
Acronym / Term
AVT
CVT
DVT
ITL
Session
VI

Limitations

This section describes SANTap limitations.
and SSI releases.
•
•
Table 23-2
Attribute
Hosts per DVT
LUNs per host
LUNs per DVT
Cisco MDS 9000 Family Troubleshooting Guide, Release 3.x
23-2
23-1includes brief definitions of some of the common SANTap acronyms and terms.
SANTap Acronyms
Definition
Appliance virtual target. The portal through which an appliance can complete
its synchronization with the target LUN. AVT can be thought of as a host
proxy for the appliance.
Control virtual target. The portal through which an appliance communicates
with SANTap. An initiator port on the appliance sends out SANTap Control
Protocol requests to the SANTap process. When the request is processed, the
response is sent back by the Cisco VI (virtual initiator) to a target port on the
appliance.
Data virtual target. A DVT is created for every port on a multi-ported target
that is included in SANTap-based services. The DVT is created in the host
VSAN. Once a DVT is created and a host logs into the DVT, SANTap installs
a DVTLUN for every configured LUN on the target for this host.
Initiator/target/LUN tuple. Uniquely identifies a LUN on a target.
A record/object that is created for every ITL whose WRITE I/Os the
appliance is interested in. A session can be thought of as a target LUN that
requires SANTap-based services.
Virtual initiator. SANTap creates 9 VIs in the appliance and target VSANs. In
the appliance, VIs are used to send responses to SANTap CP requests and also
to send copies of WRITE I/Os. In the target, VIs are used when the appliance
is down and one of the SANTap recovery tools (ARL, PWL-BPR) is enabled.
Note
One Recover Point Appliance (RPA) cluster can have only one target VSAN.
SANTap does not support IVR. You cannot run SANTap and IVR together.
SANTap Attribute Limitations
Limitation
16
32
256
1500
1024
If the appliance implementation chooses not to use these recovery
tools, the VIs are not used.
Table 23-2 describes the component limitations by SAN-OS
Cisco SAN-OS and SSI Release
Prior to Cisco SAN-OS 3.2
Cisco SAN-OS 3.2
All releases
Cisco SAN-OS 3.2
Prior to Cisco SAN-OS 3.2
Chapter 23 Troubleshooting SANTap
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