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EMC Symmetrix DMX-3 Product Guide
Symmetrix DMX-3 Hardware
Configuration rules
for vault devices
Vault devices are volumes on designated physical disk drives that
reserve a dedicated 5 GB space for vaulting data including metadata.
The following configuration rules apply to the vaulting drives and
disk directors:
◆ Each disk director pair requires 32 such dedicated devices for a
total of 160 GB of vault space per disk director pair.
◆ The vault devices can only use single-mirror data protection and
cannot be configured with TimeFinder/Snap, virtual, or dynamic
spare devices.
◆ Vault drives are eligible for permanent sparing if there is a valid
spare on the same port. The vault device cannot be moved to a
different loop, but it can be moved to a different location on the
same loop. “Permanent sparing” on page 213 contains additional
information
◆ The drive pool, virtual devices, or drive devices cannot reside in
the 5 GB of vault space. However, they can reside on the same
physical disk drive as the vault devices but not within the vault
devices.
◆ The distribution of the vault devices across the disk directors, the
back-end interfaces, and the physical disks should be such that a
full vault will be possible within the time frame dictated by the
capacity of the battery (up to five minutes).
◆ The total capacity of all of the vault hypervolumes in the system
will be at least sufficient to keep two logical copies of the
persistent part of global memory.
Symmetrix DMX disk
drive emulations
Symmetrix DMX systems support connectivity to mainframe systems
and open systems hosts. When the Symmetrix DMX systems are
configured to open systems hosts such as UNIX, Windows, Linux, or
iSeries the Symmetrix disk drives emulate standard disk drives.
When the Symmetrix DMX systems are configured to IBM
z/OS/PCM system hosts, the Symmetrix disk drives emulate IBM
CKD DASD.
Note: The Symmetrix Enterprise Storage Platform (ESP) software enabler, a
software option, is required if you plan to store and access mainframe and
open systems data on the same Symmetrix system.
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