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EMC Symmetrix DMX-3 Product Guide
Symmetrix DMX-3 Hardware
Symmetrix DMX disk
drive capacities
Precise storage capacity values depend on:
â—† Whether the user configures the disk to emulate an open systems
device or a mainframe 3390 device.
â—† Whether the user calculates a gigabyte to equal:
• 1,000 * 1,000 * 1,000 bytes
• or 1,024 * 1,024 * 1,024 bytes
â—† The number of logical volumes configured on the disk.
â—† Data protection option used: (RAID 1, RAID 5 (3+1), RAID 5
(7+1), RAID 6 (6+2), RAID 6 (14+2), RAID 10, RAID 1/0, and
SRDF).
Table 12 on page 65 shows the available Symmetrix cylinders and
storage capacities for 73 GB, 146 GB, 300 GB, 450 GB, and 500 GB disk
drives based on the open systems, mainframe, and iSeries
emulations. When calculating total system capacity, the following
must also be included: 24 GB of total capacity is reserved for internal
Symmetrix File System use. From 160 to 640 GB of total capacity is
reserved for vaulting data from memory during system power down.
Each DMX-3 system requires a minimum of two global spare drives
and one additional global spare drive for every 100 disk drives or a
portion thereof. For example, a DMX-3 with 547 disk drives requires
2 + 6= 8 global spare drives.
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