HP-UX vPars and Integrity VM V6.1.5 Administrator Guide (5900-2295, April 2013)

multiple devices at a time takes less time than adding them one at a time, with one device per call
to hpvmcreate and then one device per call in subsequent calls to hpvmmodify.
You can add any number of devices at a time up to the supported limit. However, you might find
that adding multiple devices at a time per call to hpvmmodify not only takes less time than adding
all of them at once, but also using one particular number of devices at a time provides better
hpvmmodify performance than others. For example, if you are adding a total of 256 disks,
adding 64 at a time might provide better performance than adding 8 at a time and better
performance than adding 128 at a time. The best number to use might vary depending on many
factors including how many total devices you are adding.
For a sample script for adding multiple devices, see Appendix B (page 233).
9.1.4.3 vPar/VM storage devices
vPars and Integrity VM V6.1.5 supports a variety of virtual and attachable devices. Disk and
DVD-ROM devices support several virtual media types (see Section 9.1.4.3.1 (page 117)). Physical
tapes, media changers, and CD/DVD burners are attachable; they can be used to perform data
backups directly from a vPar/VM. (See Section 9.1.4.3.2 (page 117)).
9.1.4.3.1 Virtual devices
vPar and Integrity VM V6.1.5 supports the following virtual disk types:
For more information, see...Backing Storage DeviceVirtual Disk Type
“Virtual Disks” (page 126)VSP diskVirtual Disk
Section 9.2.2.3.2 (page 126)VSP LVM or VxVM logical volume.Virtual LvDisk
Section 9.2.2.3.3 (page 128)VSP VxFS fileVirtual FileDisk
The following virtual DVD-ROM types are supported:
Described in ...Backing Storage DeviceVirtual DVD Type
Section 9.2.2.3.4 (page 129)Disk in a VSP physical DVD driveVirtual DVD
Section 9.2.2.3.6 (page 131)ISO file on a VSP VxFS file systemVirtual FileDVD
Section 9.2.2.3.3 (page 128)VSP physical DVD drive or VxFS
directory
Virtual NullDVD
(empty)
9.1.4.3.2 Attached devices
vPars and Integrity VM V6.1.5 supports a suite of attached devices to complete data backups from
a vPar/VM. vPars and Integrity VM attaches these devices using a special vPar/VM pass-through
driver. With this pass-through driver, vPar/VM I/O requests are interpreted by vPars and Integrity
VM and sent through the virtual storage subsystem to the physical device. The virtual storage
subsystem sends device responses to the vPar/VM pass-through driver, which sends the responses
to the virtual machine. Because the vPar/VM can see all the data and responses, support for the
attached physical device must be provided by the guest OS.
Attached devices include:
CD/DVD burners
Media changers
Tape devices
The maximum transfer size can be 1 MB for any guest operating system.
9.1 Introduction to vParVM storage 117