HP vPars and Integrity Virtual Machines V6.1 Administrator Guide

• storage is one of the following: disk, lv, file, null, attach, or npiv.
The selection of storage type defines what VSP system files apply. For example, lv implies
the use of logical volume character device files.
For virtual devices, the selection of VSP storage determines what type of virtual media the
virtual device uses. For example, the selection of lv for a virtual disk, makes it a Virtual LvDisk
to the VM. It does not support the attach storage type.
A VSP storage entity can only be used for one VM device type at a time. For example, a VSP
CD/DVD drive cannot be used for a Virtual DVD and an attached burner at the same time.
• location is a VSP system file.
The file permissions on the VSP system file are not honored by vPars and Integrity VM. vPar/VM
device types that support write operations can still do so using a VSP system file marked read
only. Backing stores provided as virtual disks can be written to regardless of the file permission
settings on the backing store. A backing store provided as a virtual DVD is always read-only.
Attached devices do not consider file permissions when backing up data.
More than one VSP system file might point to the same VSP storage entity. For example, if
multiple paths to storage are present on the VSP, more than one disk system file can point to
the same disk. Different VSP system files change how I/O is routed to the VM storage resource,
but the system files point to the same storage entity. Therefore, different system files cannot
constitute different vPar/VM storage resources. A given vPar/VM storage resource can only
be specified once to a given vPar/VM. Therefore, only one VSP system file per VSP storage
entity can be provided to a vPar/VM (see Section 9.2.1.4 (page 119)).
Not all virtual device types support all VSP storage types (see Section 9.1.4 (page 114)). Complete
VM storage resource statements are discussed in the next section.
9.2.2.3 Storage resource statements
This section provides information about formulating complete valid resource statements for vPar/VM
storage devices.
To specify a vPar/VM storage device for a vPar/VM, use a complete valid resource statement with
the hpvmcreate or hpvmmodify command. The resource statement is a combination of the
vPar/VM guest resource specification (described in Section 9.2.2.1 (page 122)) and the VSP Storage
Specification (described in Section 9.2.2.2 (page 122)). This section provides examples of complete
resource statements for each of the following types of virtual storage devices:
• Virtual disks
• Virtual LvDisks
• Virtual FileDisks
• Virtual DVDs
• Virtual FileDVDs
• Virtual NullDVDs
• Attachable Devices
A vPar/VM can have up to 128 AVIO devices total (number of virtual and attached devices).
The minimum size of a virtual storage resource is 512 bytes for virtual disk and 2048 bytes for a
virtual DVD.
Do not specify the same storage resource, virtual or attached, for the same vPar/VM more than
once (see Section 9.2.1.4 (page 119)). Unless otherwise noted, storage resources, virtual or attached,
cannot be simultaneously shared by vPars/VMs.
9.2 Configuring vPar/VM storage 123