3–Data Migration ObjectsPresented TargetsISR654608-00 C 3-9Presented TargetsFor online data migration, the server must access the source LUN through theiSR6200. To allow this access, you must first create a virtual presentation of thesource array target port. This virtual presentation is referred as a presented target.Each presented target represents a VPG and a source array target port. Thus, asingle source array target port may have up to four presented targets, oneassociated with each VPG. The following example shows how to create multiplepresented targets created by combining a target port on the source array with theiSR6200 VPG.Example: Four target ports (WWPNs) on the source array are zoned in with two VPGson the iSR6200. LUNs associated with VPG1 are for Server1, and LUNs associated withVPG2 are for Server2. Four presented target ports (WWPNs) depict the four source array targetports discovered on VPG1. These presented targets (WWPNs) are zoned inwith appropriate adapter ports on Server1. Additionally, when LUNs(discovered through VPG2) are presented to Server2, four new presentedtargets (WWPNs) are created. The new presented targets depict the samefour source array target ports now discovered through VPG2. Thus, youcreate a total of eight presented targets through the iSR6200.Migration to a Thin-Provisioned LUNThe iSR6200 provides the option to create a data migration job to athin-provisioned LUN. You can migrate data either online or offline.The iSR6200 detects thin-provisioned storage based on SCSI Read capacitycommands. Some storage arrays, even though they support thin provisioning,may not indicate the support for thin-provisioned storage in the SCSI ReadCapacity response.NOTE:QLogic recommends that if a single, source array, Fibre Channel target portis discovered through one VPG across both blades, you should create onlyone presented target across all four physical Fibre Channel blade ports. Forexample, in Figure 2-5 on page 2-5, target ports SA1, SA2, SB1, and SB2are discovered on both blades through VPG1. Presented targets (PT) PT1(SA1 + VPG1) and PT4 (SB2 + VPG1) are presented through Fibre Channelports on Blade 1, and PT2 (SA2 + VPG1) and PT3 (SB1 + VPG1) arepresented through Blade 2.
