72
EMC Symmetrix DMX-3 Product Guide
Symmetrix DMX-3 Hardware
A single Symmetrix system can simultaneously support both 3380
and 3390 device emulations. Table 15 on page 72 lists the Symmetrix
characteristics for some standard IBM device emulation modes.
Symmetrix systems also support nonstandard device sizes, as long as
the cylinder count does not exceed that of the equivalent IBM device
type.
Contact your EMC Sales Representative for 3380 support.
Note: Appendix A “Symmetrix DMX-3 Specifications,”contains more IBM
DASD emulation characteristics.
Mixed track
geometries
You can configure a Symmetrix DMX system with both 3380 and 3390
track geometries on the same disk device (3380 and 3390 devices
cannot be defined in the same SSID or LCU). A single disk device can
contain up to 255 logical volumes, depending on the data protection
used.
Note: “Mainframe systems hypervolumes” on page 132 contains
information on configuring mainframe logical volumes.
IBM/PCM data and
command formats
All Symmetrix systems support the count-key-data (CKD) and
extended count-key-data (ECKD) format used by IBM 3390 and 3380
DASD. For a full description of the channel command words (CCW)
supported, refer to the IBM 3390 Storage Control Reference. Figure 12
on page 73 shows the CKD track format emulated for 3390 and 3380
DASD.
Table 15 IBM DASD emulation characteristics
IBM DASD model MB/volume Bytes/track Bytes/cylinder Cylinders/volume
3390-54
a
55,688 56,664 849,960 65,520
3390-27 27,844 56,664 849,960 32,760
3390-9 8,514 56,664 849,960 10,017
3390-3 2,838 56,664 849,960 3,339
3390-2 1,892 56,664 849,960 2,226
3390-1 946 56,664 849,960 1,113
3380K
a
1,891 47,476 712,140 2,655
a. Contact your local EMC Sales Representative for currently supported IBM Controller/DASD emulation modes and 3380 support.
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