For native z/VM use, the DS8000 volumes appear as 9336-20 DASD. For guest use, the DS8000 volumes can appear either as 9336-20 DASD or as SCSI LUNs directly accessed through FCP subchannels. DFSMS/VM FL221 support for SCSI LUNs larger than …

VM officially supports IBM TotalStorage 1750 (DS6000), 2105, and 2107 (DS8000) SCSI disks as emulated 9336 DASD. However, other SCSI disks may also work since a generic SCSI driver is provided in addition to the TotalStorage drivers. VM63534 is required for 2107 support; VM63535 is required for 1750 support.

z/VM supports a SCSI disk, which is emulated as a 9336-020, up to a capacity of 2147483640 512-byte blocks (1 TB). Note, however, that directory, paging, and spooling allocations must reside within the first 16777216 blocks (blocks 0 to 16777215) of a CP-formatted disk.

SCSI disks can be used directly by a guest operating system when an FCP subchannel is dedicated to a guest. Such a guest must contain its own SCSI device driver – Linux® on IBM Z® is one such guest. SCSI disks can also be used as emulated 9336 model 20 fixed-block-architecture (FBA) disks.

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The 9336 did not support RESERVE/RELEASE and so, even if you define an MDISK on an EDEVICE with MWV, attempts to use RESERVE/RELEASE will be rejected by CP. Implementation of RESERVE/RELEASE would require that CP convert them to one or more SCSI PERSISTENT RESERVE functions.

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From Bill Norton, IBM QDASD generates a table containing information about selected DASD devices on a z/VM system. The information is collected using the QUERY DASD, QUERY EQID, and QUERY EDEVICE commands so you will need the appropriate privileges to use this tool (class B by default).