EMC Symmetrix DMX-3, Product Manual

Page: 128 / 326

128 EMC Symmetrix DMX-3 Product Guide
Performance and Optimization
UNIX and PC server
hosts
For Symmetrix disk drives attached to UNIX or PC server hosts, each
cylinder contains 15 tracks, and each track contains 128 blocks of 512
bytes.
Logical volume
mapping The logical-to-physical relationship that you choose can
automatically apply to all devices in the unit. You can customize the
logical-to-physical relationship on each device as well as the size of
each logical volume. For example, if the logical-to-physical ratio
chosen is 8:1, the logical volume mapping is similar to that shown in
Figure 32 on page 128 .
Figure 32 Logical volume mapping (8:1)
Metavolumes Several operating systems (such as Windows NT and Windows 2000),
some applications software, and some open systems environments
require larger volumes than are provided by standard Symmetrix
physical disk drives.
Table 24
Symmetrix open systems disk capacities and cylinders
Drive type Maximum usable Symmetrix cylinders
a
73 GB 74,611
146 GB 149,227
300 GB 304,932
450 GB 457,764
500 GB 508,626
a. The maximum number of usable cylinders for one logical volume is 65,520.
Volume 00 Volume 01 Volume 02 Volume 03
Volume 04 Volume 05 Volume 06 Volume 07
Volume 08 Volume 09 Volume 0A Volume 0B
Volume 0C Volume 0D Volume 0E Volume 0F
Volume 20 Volume 21 Volume 22 Volume 23
Volume 24 Volume 25 Volume 26 Volume 27
Volume 28 Volume 29 Volume 2A Volume 2B
Volume 2C Volume 2D Volume 2E Volume 2F
Disk 0 Disk 1 Disk 2 Disk 3