Lucent Technologies 585-210-940 User Manual

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Introduction to Disk Mirroring 
CentreVu CMS Release 3 Version 8 Disk-Mirrored Systems
Disk mirroring defined
1
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Introduction to Disk Mirroring
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This chapter introduces you to “disk mirroring,” an optional 
feature of CentreVu
 Call Management System (CMS) that 
provides you with a completely redundant set of data, helping 
to ensure data security. To use disk mirroring, you must have a 
Sun
*
 Enterprise
*
 3000 or Sun Enterprise 3500 platform running 
CMS r3v8.
Disk mirroring defined
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“Mirrors” are a feature of the 
Solstice DiskSuite
*
 software package. They 
allow you to build a hard disk system containing two—or even three—
complete sets of data. Having such data redundancy greatly reduces the 
risk of data loss should a hard disk drive fail or your system crash. While 
mirrors greatly reduce the risk of losing data, however, they are not 
meant to be a substitute for regular backups. Mirrored systems must be 
backed up just as often as unmirrored systems.
Metadevices
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The
 Solstice DiskSuite software package allows multiple disk partitions to 
be logically combined to create a single large partition. Using the 
Solstice 
DiskSuite package allows CMS databases to span multiple disks, and so 
grow quite large.
Solstice DiskSuite uses virtual disks to manage physical disks and their 
associated data. In 
Solstice DiskSuite, a virtual disk is called a 
metadevice. To a software application, a metadevice is identical to a 
physical disk drive. 
Solstice DiskSuite handles all I/O requests directed at 
a metadevice, converting them into I/O requests for the underlying disks. 
Solstice DiskSuite metadevices are built from slices (disk partitions). A 
system controlled by 
Solstice DiskSuite may contain any number of 
metadevices, each of which may comprise any combination of disk 
partitions. 
Once a metadevice has been set up, the underlying disk partitions 
can be accessed only through the metadevice.
*
Sun, Enterprise, and Solstice DiskSuite are trademarks or registered trademarks of Sun Microsystems, Inc.