Red Hat NETSCAPE MANAGEMENT SYSTEM 4.5 Manual do Utilizador descarregar pdf (Página 212)

Disks

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Using Storage Area Networks

with ESX Server

VMware ESX Server can be used effectively with storage area networks (SANs). ESX

Server supports Qlogic and Emulex host bus adapters, which allow an ESX Server

computer to be connected to a SAN and to see the disk arrays on the SAN.

Detecting All LUNs

In order to use all storage devices on your SAN, you may need to change some

VMkernel configuration options as described below. To make these changes, log in to

the VMware Management Interface as root, then go to Configure System > VMkernel

Configuration. To change an option, click the current value, then enter the new value

in the dialog box and click Update.

By default, the VMkernel scans for only LUN 0 to LUN 7 for every target. If you are using

LUN numbers larger than 7 you must change the setting for DiskMaxLUN field from

the default of 8 to the value that you need. For example, if you now have LUN

numbers 0 to 15 active, set this option to 16.

By default, the VMkernel is not configured to support sparse LUNs — that is, a case

where some LUNs in the range 0 to N are not present, but LUN N is present. If you

need to use such a configuration, set the DiskSupportSparseLUN field to 1. (The

default is 0.)

Special Options for SAN Configurations

Because the disks on the SANs can potentially be accessed by multiple ESX Server

computers, there are some configuration issues that are unique to SANs.

Note: Be sure that only one computer has access to the SAN while you are

configuring it for use with ESX Server and formatting it. If the other computers that

will access the SAN are also ESX Server machines, they should be powered off while

you are configuring the SAN. After you have finished the configuration and checked

to be sure all partitions on the shared disk are set for public or shared access (as

described in the VMFS Accessibility section below), you may connect and power on

the other computers that need access to the SAN.

VMFS Accessibility

Any VMFS partition on a disk that is on a SAN should have VMFS accessibility set to

public or shared, rather than private. Choosing public makes the VMFS partition

available to multiple physical servers and to virtual machines on those servers, but

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Red Hat NETSCAPE MANAGEMENT SYSTEM 4.5 Manual do Utilizador Página 212