6.4.4 Notes about SCSI reservation for shared disk

• It is not possible to create multiple partitions on a single physical device so that each server can use a different partition.

  SCSI reservation is performed for each physical device. If separate partitions are used by the different servers, the disk cannot be protected because SCSI reservations cannot be obtained correctly.

• The same names must be specified in the same order on each host for the device names specified in the scsi_device and dmmp_device operands in the server environment definition. If the specified names or their specification order differ between hosts, SCSI reservations might not be obtained correctly.

  In the case of a redundant configuration using HDLM, the order in which the device names are specified in the scsi_device operand must be the same on each host. If the same disk is used for all hosts in a hot-standby configuration, different names can be specified.

• In the scsi_device and dmmp_device operands, you must specify all device names that correspond to the device file names of the physical volumes that make up each volume group specified in the disk operand.

• For the shared disks corresponding to the logical devices specified in the scsi_device and dmmp_device operands, do not use an LVM mirror or Linux standard software RAID (md).

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