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40 SVA Path User’s Guide

If there are more than one set of redundant paths, there could be

more than one device with a given target and LUN number. For

this reason, SVA Path creates a different virtual HBA for each set

of redundant physical HBAs. For example, if one device is

accessible via

c1t0d0 and c2t0d0, and another device is

accessible via c3t0d0 and c4t0d0, SVA Path would create two

new device files

c81t0d0 (for c1t0d0 and c2t0d0) and

c83t0d0 (for c3t0d0 and c4t0d0).

Devices without

Redundant Paths to

the Host

SVA Path creates virtual device files for all supported devices and

blocks access to them through their original device filenames

whether or not they are accessible via redundant paths. Virtual

device files are created for devices that have only one physical

path for two reasons:

1. a device could actually have more than one path but only one

was functional at the time that SVA Path was installed

2. the device could be part of a SAN configuration where it is

necessary to prohibit applications on the local host from

accessing the device because the device was assigned to

another host on the SAN.

Logical Volume Manager

Logical Volume Manager (LVM) is a disk management system

provided by HP in all versions of HP-UX 10.x and HP-UX 11.x.

The LVM allows you to manage storage as logical volumes. This

section of the manual describes some concepts used by the LVM

and explains how to create and expand logical volumes. For more

detailed information, please consult the man pages for

lvm(7)and

the HP-UX System Administration Tasks manual.

As with many systems administration tasks you can use the HP-

System Administration Manager (SAM) to create and

maintain some logical volumes. However, because SAM cannot

recognize SVA Path devices, you must use the LVM commands

pvcreate, vgcreate and lvcreate.

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Seagate ST39103LC Guida Utente Pagina 50