Product manual

Managing Critical Data
77 A1 69UP Rev00 5-3
5.1.3 Data Protection Options
Although the CDA 7 has standard features that provide a higher level of data
availability than conventional disk, the options listed below ensure an even greater
level of data recoverability and availability.
You can choose from the following CDA 7 data protection options to match your
critical data requirements:
• RAID-1 Mirroring
• CDA 7 Remote Data Facility (SRDF)
5.1.3.1 RAID-1 Option (Mission Critical/ Business Critical)
Mirroring provides the highest performance, availability, and functionality for all
mission critical and business critical applications. With the Mirroring option,
CDA 7 maintains two identical copies of a logical volume on separate disk devices.
Should CDA 7 be unable to read data from one volume of a mirrored pair, it
immediately retrieves the data from the other logical volume.
5.1.3.2 CDA 7 Remote Data Facility (SRDF)
The CDA 7 SRDF option is a mechanism that maintains a mirror image of data at a
logical volume level in two CDA 7 subsystems that can be located in physically
separate sites.
Within the Bull DPS 7000/GCOS 7 environment, the SRDF for GCOS 7 solution is
aimed at providing a back-up solution in the situation where a production site is out
of work due to a major disaster event. Refer to § SRDF for GCOS 7.