EMC Symmetrix DMX-3, Product Manual, Page: 190 / 326

190 EMC Symmetrix DMX-3 Product Guide
Data Integrity, Availability, and Protection
Symmetrix Remote Data
Facility (SRDF) Provides an information protection/ business continuance solution by maintaining a mirror image
of data in multiple Symmetrix systems that can be in physically separate locations.
For more information on SRDF, refer to the EMC Symmetrix Remote Data Facility (SRDF)
Product Guide. See
“SRDF family of products” on page 221 for related information.
Dynamic sparing Increases data availability by copying the data on a failing volume to a spare volume until the
original device is replaced. Dynamic sparing is a required data protection method for all DMX-3
systems.
“Dynamic sparing” on page 216 contains more information.
“RAID 5 attributes” on page 198 contains information on RAID 5 sparing.
Permanent sparing Replaces a faulty drive automatically from a list of available spares residing in the Symmetrix
system without CE involvement on site.
“Permanent sparing” on page 213 contains more information.
Table 28 Data protection options (2 of 2)
Data protection option Description