Sun Microsystems Fire 880, Руководство пользователя

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152 Sun Fire 880 Server Owner’s Guide • August 2001
About Volume Management Software
Sun Microsystems offers two different volume management applications for use on
Sun Fire 880 systems:
■
VERITAS Volume Manager software
■
Solstice DiskSuite software
Volume management software lets you create disk volumes. Volumes are logical disk
devices comprising one or more physical disks or partitions from several different
disks. Once a volume is created, the operating system uses and maintains the
volume as if it were a single disk. By providing this logical volume management
layer, the software overcomes the restrictions imposed by physical disk devices.
Sun’s volume management products also provide RAID data redundancy and
performance features. RAID, which stands for
redundant array of independent disks , is
a technology that helps protect against disk and hardware failures. Through RAID
technology, volume management software is able to provide high data availability
,
excellent I/O performance, and simplified administration.
Sun’s volume management applications offer the following features:
■
Support for several types of RAID configurations, which provide varying degrees
of availability, capacity, and performance
■
Hot-spare facilities, which provide for automatic data recovery when disks fail
■
Performance analysis tools that let you monitor I/O performance and isolate
bottlenecks
■
A graphical user interface that simplifies storage management
■
Support for online resizing, which enables volumes and their file systems to grow
and shrink online
■
Online reconfiguration facilities, which let you change to a different RAID
configuration or modify characteristics of an existing configuration
VERITAS Dynamic Multipathing
VERITAS Volume Manager software actively supports multiported disk arrays. It
automatically recognizes multiple I/O paths to a particular disk device within an
array. Called Dynamic Multipathing (DMP), this capability provides increased
reliability by providing a path failover mechanism. If one connection to a disk is lost,
VERITAS Volume Manager continues to access the data over the remaining