HP P6000 Replication Solutions Manager User Guide (T3680-96089, October 2012)

is a corresponding entry (identification) in a host's low-level devices table. The replication manager
discovers these devices on enabled hosts and displays them in the Disk Devices tab on the Host
Volumes content pane. See Host volume views and Viewing host volumes.
File system types
The file system property indicates whether a host volume is formatted with a file system or not.
Examples of file system types:
AdvFS. Tru64 UNIX
ufs. AIX, HP-UX, Solaris, Tru64 UNIX
vxfs. HP-UX
NTFS. Windows
Files-11, ODS-2, ODS-5. OpenVMS ext2, ext3 Linux
If a host volume is not formatted with a file system, the property displays raw disk information. See
host volumes Raw disks.
Instant Restore
The instant restore feature allows you to restore data on a host volume or host volume group with
data from one of its previously created replicas (snapclone or snapshot). The operation is instant
because the restored data is available within seconds for host I/O (the actual data transfer occurs
in the background).
For example, assume that the database named sales_db becomes corrupt. You can instantly restore
it to a prior state from one of its replicas.
RR-20070523...<======sales_db
replica to restore fromvolume being restored
Logical volumes and volume groups
Some enabled hosts use a logical volume manager (LVM) to organize storage into volume groups
and logical volumes. The replication manager discovers host volumes on enabled hosts if the
volumes were created with a supported OS and LVM.
The following description uses general terms that may differ from the terminology used in a specific
OS and LVM. See also Tru64 UNIX host volumes.
Volume groups
A host-based volume group is a named pool of storage that the host's LVM can access. When the
underlying physical storage is on an HP storage system, you can use the replication manager to
interact with a volume group. A volume group is not considered to be a component with which
hosts can perform I/O.
Logical volumes
An LVM organizes a host's volume group into smaller portions called logical volumes. When the
underlying physical storage is on an HP storage system, you can use the replication manager to
interact with a logical volume.
Each logical volume in a volume group is considered to be a component with which hosts can
perform I/O. Logical volumes can contain file systems or be raw storage. See Raw disks.
LUN
In each storage system, logical unit numbers (LUNs) are assigned to its virtual disks. When a virtual
disk is presented to hosts, the storage system and the hosts perform I/O by referencing the LUN.
130 Host volumes