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#Veritas volume manager administration guide linux how to#
For example, a volume can be mirrored on separate disks or moved to use different disk storage.Īfter installing VxVM on a host system, you must bring the contents of physical disks under VxVM control by collecting the VxVM disks into disk groups and allocating the disk group space to create logical volumes.īringing the contents of physical disks under VxVM control is accomplished only if VxVM takes control of the physical disks and the disk is not under control of another storage manager such as LVM.įor more information on how LVM and VxVM disks co-exist or how to convert LVM disks to VxVM disks, see the Veritas InfoScale Solutions Guide. Configuration changes can be accomplished without causing disruption to applications or file systems that are using the volume. The configuration of a volume can be changed by using VxVM user interfaces. Due to its virtual nature, a volume is not restricted to a particular disk or a specific area of a disk. A volume consists of one or more plexes, each holding a copy of the selected data in the volume. Each subdisk represents a specific portion of a VxVM disk, which is mapped to a specific region of a physical disk.Ī plex consists of one or more subdisks located on one or more physical disks.Ī volume is a virtual disk device that appears to applications, databases, and file systems like a physical disk device, but does not have the physical limitations of a physical disk device. A VxVM disk can be divided into one or more subdisks. VxVM allocates disk space using subdisks. VxVM allocates storage from a contiguous area of VxVM disk space.Įach VxVM disk corresponds to at least one physical disk or disk partition.Ī VxVM disk typically includes a public region (allocated storage) and a small private region where VxVM internal configuration information is stored.Ī subdisk is a set of contiguous disk blocks. Disk group names must not contain periods (.).Ī VxVM disk is assigned to a physical disk, when you place the physical disk under VxVM control. A disk group name can be up to 29 characters long.
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A disk group configuration is a set of records with detailed information about related VxVM objects, their attributes, and their connections. A disk group is a collection of disks that share a common configuration and which are managed by VxVM.