Data Protection Options - EMC Symmetrix DMX-3 Product Manual

Data protection
options
Mirroring (RAID 1)
The periodic system check tests all components as well as microcode
integrity. Symmetrix systems report errors and environmental
conditions to the host system as well as the EMC Customer Support
Center.
Although the Symmetrix system has standard features that provide a
higher level of data availability than conventional DASD, the options
described in this section ensure an even greater level of data
recoverability and availability. These data protection options are
configurable at the physical volume level so that different levels of
protection can be applied to different datasets within the same
Symmetrix system.
Working with your local EMC Sales Representative, you can choose
from the following Symmetrix data protection options to match your
critical data requirements:
"Mirroring (RAID 1)" on page 159
"RAID 1/0" on page 160
"RAID 10" on page 160
"RAID 5" on page 160
"RAID 6" on page 160
"Symmetrix Remote Data Facility (SRDF)" on page 161
"Permanent sparing" on page 213
"Dynamic sparing" on page 216
Mirroring (RAID 1) provides the highest performance, availability,
and functionality for all mission-critical and business-critical
applications. With the Mirroring option, Symmetrix systems maintain
two identical copies of a logical volume on separate disk drives.
Should the Symmetrix system be unable to read data from one of a
mirrored pair, it immediately retrieves the data from the other logical
volume.
Note: "Disk mirroring (RAID 1) concepts" on page 191
information on the Symmetrix Mirroring option.
Data Integrity, Availability, and Protection
provides more
Overview 159