EMC Symmetrix Disk Arrays

The Dynamic Multipathing feature (DMP) of the Volume Manager works with the EMC Symmetrix disk array only if the disk array is configured in the Common Serial Number Mode. This is because only the Common Serial Number Mode configuration provides unique device identification on different paths for DMP to configure its database. Without this mode, DMP cannot provide the multipathing functionality. DMP cannot access EMC Symmetrix disks as individual disks with a single path it found by scanning the device information tree in the kernel.

Ultra SCSI and fast-wide differential (FWD) SCSI support has been tested on the EMC OSD (Open System Director) controller.

For the DMP functionality to work with the EMC Symmetrix disk array, the following conditions must be met:

• Common Serial Number Mode should be enabled for all channels that participate in DMP. This operation should be performed by the EMC Customer Engineer before installing the VERITAS software packages.
• Disable queue reset on unit attention mode must be set for all channels that participate in DMP. This operation should be performed by the EMC Customer Engineer before installing the VERITAS software packages.
• The minimum level of microcode on the EMC Symmetrix should be as shown in the following table.

  Sym	Model	Microcode
  4	3330, 3430 and 3700	5265 and 5266
  4.8	3630, 3830 and 3930	5265 and 5266
  5	8130, 8430 and 8730	5566

Contact your EMC Technical Support Representative for further instructions on configuring EMC hardware.

See your sales representative for further updates on hardware support.