vsphere-esxi-vcenter-server-55-storage-guide

Chapter 6 Modifying Fibre Channel Storage for ESXiBecause this array is an active-passive disk array, the following general considerations apply.• The default multipathing policy for CLARiiON arrays that do not support ALUA is Most RecentlyUsed. For CLARiiON arrays that support ALUA, the default multipathing policy is VMW_PSP_FIXED.The ESXi system sets the default policy when it identifies the array.• To use boot from SAN, make sure that the active SP is chosen for the boot LUN’s target in the HBABIOS.IMPORTANT For ESXi to support EMC CLARiiON with ALUA, check the HCLs to make sure that you usethe correct firmware version on the storage array. For additional information, contact your storage vendor.EMC Symmetrix Storage SystemsEMC Symmetrix storage systems work with ESXi hosts in FC SAN configurations. Generally, you use theEMC software to perform configurations.The following settings are required on the Symmetrix networked storage system. For more information, seethe EMC documentation.• Common serial number (C)• Auto negotiation (EAN) enabled• Fibrepath enabled on this port (VCM)• SCSI 3 (SC3) set enabled• Unique world wide name (UWN)• SPC-2 (Decal) (SPC2) SPC-2 flag is requiredThe ESXi host considers any LUNs from a Symmetrix storage array with a capacity of 50MB or less asmanagement LUNs. These LUNs are also known as pseudo or gatekeeper LUNs. These LUNs appear in theEMC Symmetrix Management Interface and should not be used to hold data.IBM System Storage DS4800 Storage SystemsIBM System Storage DS4800 systems used to be called IBM FAStT. A number of storage array vendors(including LSI and StorageTek) make SAN storage arrays that are compatible with the DS4800.For your host to work with IBM DS4800 and other compatible systems, make sure to set the multipathingpolicy on your host to Most Recently Used.Configuring the Hardware for SAN Failover with DS4800 Storage ServersThis topic provides information on how to set up a highly available SAN failover configuration with anESXi host and DS4800 storage.You must have the following hardware components:• Two FC HBAs, such as QLogic or Emulex, on each ESXi machine.• Two FC switches connecting the HBAs to the SAN (for example, FC switch 1 and FC switch 2).• Two SPs (for example, SP1 and SP2).Each SP must have at least two ports connected to the SAN.Use the following connection settings for the ESXi host, as shown in SAN Failover:• Connect each HBA on each ESXi machine to a separate switch. For example, connect HBA1 to FCswitch 1 and HBA2 to FC switch 2.VMware, Inc. 51