Cisco MDS-9124 Troubleshooting Guide - Page 466

Definitions Chapter 23 Troubleshooting SANTap Send documentation comments to [email protected] Definitions Table 23-1includes brief definitions of some of the common SANTap acronyms and terms. Table 23-1 SANTap Acronyms Acronym / Term AVT CVT DVT ITL Session VI 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 If the appliance implementation chooses not to use these recovery tools, the VIs are not used. Limitations This section describes SANTap limitations. Table 23-2 describes the component limitations by SAN-OS and SSI releases. • One Recover Point Appliance (RPA) cluster can have only one target VSAN. • SANTap does not support IVR. You cannot run SANTap and IVR together. Table 23-2 SANTap Attribute Limitations Attribute Hosts per DVT LUNs per host LUNs per DVT Limitation 16 32 256 1500 1024 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 23-2 Cisco MDS 9000 Family Troubleshooting Guide, Release 3.x OL-9285-05