The glossary below contains many of the terms you will find in common use throughout the Symantec Security Response website. Please refer to this list to find definitions of terms and answers to other Internet security-related questions.

Mirrored Volume RAID-1

A mirrored dynamic volume is a fault-tolerant volume that duplicates your data on two or more physical disks. A mirror provides redundancy by simultaneously writing the same data onto two or more separate mirrors (or plexes) that reside on different disks. If one of the disks fails, data continues to be written to and read from the unaffected disk or disks. SFW supports up to 32 mirrors.

In contrast, the mirrored volumes originally created in Disk Administrator and supported for use on basic disks have only two mirrors.

A mirrored volume is slower than a RAID-5 volume in read operations but faster in write operations. You can create mirrored volumes only on dynamic disks. In SFW, you can extend mirrored volumes.