Seagate ST34572WC Especificaciones descargar pdf (Pagina 5)

Starting with the HP-UX 11i v3 release, HP no longer requires or recommends that you configure LVM

with alternate links. However, it is possible to maintain the traditional LVM behavior. To do so, both

of the following criteria must be met:

 Only the legacy device special file naming convention is used in the LVM volume group

configuration.

 The scsimgr command is used to disable the Mass Storage Subsystem multipath behavior.

See the following appendices for more information:

 Appendix A documents the two different types of device files supported starting with HP-UX 11i v3

release

 Appendix B documents the two different types of device special naming models supported starting

HP-UX 11i v3 release

Also, see the LVM Migration from legacy to agile naming model HP-UX 11i v3 release white paper.

This white paper discusses the migration of LVM volume group configurations from legacy to the agile

naming model.

LVM Online Disk Replacement (LVM OLR)

LVM online disk replacement (LVM OLR) simplifies the replacement of disks under LVM. With LVM

OLR, you can temporarily disable LVM use of a disk in an active volume group. Without it, you

cannot keep LVM from accessing a disk unless you deactivate the volume group or remove the logical

volumes on the disk.

The LVM OLR feature introduces a new option, –a, to pvchange command. The –a option disables

or re-enables a specified path to an LVM disk. For more information on LVM OLR, see the LVM Online

Disk Replacement (LVM OLR) white paper.

Starting with the HP-UX 11i v3 release, when the Mass Storage Subsystem multipath behavior is

enabled on the system and LVM is configured with persistent device files, disabling specific paths to a

device using pvchange –a n command does not stop I/Os to that path as they did in earlier

releases because of the Mass Storage Stack native multipath functionality. Detaching an entire

physical volume (all paths to the physical volume) using the pvchange –a N command is still

available in such cases to perform Online Disk Replacement. When the Mass Storage Subsystem

multipath behavior is disabled and legacy DSFs are used to configure LVM volume groups, the

traditional LVM OLR behavior is maintained.

On HP-UX 11i v1 and HP-UX 11i v2 releases, LVM OLR is delivered in two patches: one patch for the

kernel and one patch for the pvchange command.

Both command and kernel components are required to enable LVM OLR (applicable for 11i v1 and

11i v2 releases):

 For HP-UX 11i v1, install patches PHKL_31216 and PHCO_30698 or their superseding patches.

 For HP-UX 11i v2, install patches PHKL_32095 and PHCO_31709 or their superseding patches.

Note: Starting with HP-UX 11i v3, the LVM OLR feature is available as part of base operating

system.

Mirroring Critical Information, Especially the Root Volume Group

By using mirror copies of the root, boot, and primary swap logical volumes on another disk, you can

use the copies to keep your system in operation if any of these logical volumes fail.

Mirroring requires the add-on product HP MirrorDisk/UX (B2491BA). This is an optional product

available on the HP-UX 11i application release media. To confirm that you have HP MirrorDisk/UX

installed on your system, enter the swlist command. For example:

1 2 3 4 5 6 7 8 9 10 ... 66 67

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