HP-UX vPars and Integrity VM V6.3 Administrator Guide

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 vPar or VM storage
resource, but the system files point to the same storage entity. Therefore, different system files
cannot constitute different vPar or VM guest storage resources. A given storage resource can
only be specified once to a given vPar or VM guest. Therefore, only one VSP system file per
VSP storage entity can be provided to a vPar or VM guest (see Section 6.4.1.4 (page 69)).
Not all virtual device types support all VSP storage types (see Section 6.3 (page 65)). The next
section discusses the VM storage resource statements.
6.4.2.3 Storage resource statements
This section provides information about formulating complete valid resource statements for vPar
and VM guest storage devices.
To specify a storage device for a vPar or VM guest, use a complete valid resource statement with
the hpvmcreate or hpvmmodify command. The resource statement is a combination of the vPar
and VM guest resource specification (described in Section 6.4.2.1 (page 75)) and the VSP Storage
Specification (described in Section 6.4.2.2 (page 76)). 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
NOTE: For more information about resource statement for an NPIV HBA, see Section 7.4
(page 102).
A vPar or VM guest can have up to 256 non-NPIV devices (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 or VM guest more
than once (see Section 6.4.1.4 (page 69)). Unless otherwise noted, storage resources, virtual or
attached, cannot be simultaneously shared by vPars and VM guests.
The resource statements in the following subsections do not contain vPar or VM guest hardware
addressing. The PCI bus, PCI slot, and AVIO target numbers are optional.
6.4.2.3.1 Virtual Disks
A Virtual Disk is an emulated AVIO disk whose virtual media comes from a VSP disk LUN. The
VSP disk LUN is specified using a character device file. The character device file is owned by the
HP-UX esdisk driver.
Virtual Disk resources cannot be shared simultaneously across active vPars and VM guests (except
in certain cluster configurations, as indicated in this document). Virtual Disk resources can be
changed dynamically among active vPars and VM guests.
6.4 Configuring vPar and VM guest storage 77