Open systems hypervolumes
127
Performance and Optimization
Open systems hypervolumes
This section describes the Hypervolume Extension feature on
Symmetrix open systems units. It includes the following information:
◆ “Hypervolume extension feature” on page 127
◆ “Disk drive cylinders” on page 127
◆ “Logical volume mapping” on page 128
◆ “Metavolumes” on page 128
Note: “Mainframe systems hypervolumes” on page 132 provides
information on using the hypervolume extension feature in Symmetrix units
connected to mainframe hosts.
Hypervolume
extension feature
The hypervolume extension feature provides configuration flexibility
by allowing one physical device to be split into two or more logical
volumes. This capability is particularly useful for some 32-bit
implementations of UNIX that allow only 2 GB file systems per single
logical disk.
The Symmetrix DMX-3 allows up to 160 logical volumes on each
Symmetrix DMX-3 open systems physical disk drive and up to 64,000
logical volumes (address range 0x000 - 0xF9FF) per Symmetrix
DMX-3 system, depending on the hardware configuration and the
data protection options.
Contact your local EMC Sales Representative for the number of
logical volumes currently supported per DMX-3 system.
Note: For more information on logical volumes supported on Symmetrix
DMX-3 disk drives and systems, refer to “Symmetrix DMX-3 logical volume
capacities” on page 66. Configuration requirements for Symmetrix systems
vary according to the applications used. To configure logical volumes for
optimum Symmetrix system performance, consult your local EMC Sales
Representative.
Disk drive cylinders
The Symmetrix DMX-3 uses 3.5-in, low-profile disk drives that are
available in the following storage capacities and maximum usable
Symmetrix cylinders (Table 24 on page 128).
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