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Configuring a Boot Device on an EMC Storage Array

Common limitations

Boot configurations must not deviate from the following limitations

established by EMC:

◆ The EMC Storage device must have enough disk space to hold the

Linux operating system.

◆ A maximum of 32 volumes may be configured on the EMC

Storage Array port that will be used to boot Linux.

◆ EMC recommends that you install, rather than upgrade, the

kernel-source and kernel UP, SMP, and Hugemem RPMs.

◆ For RHEL4 U4, 4 Gb HBA driver will not load automatically at

boot time. The adapter will not detect boot LUN and give no

device found error.

To force load 4 Gb driver, at the point where it says no device

found, click on ADD DEVICE, then select QLA2400.

◆ VERITAS VxVM/DMP is not supported on Linux hosts booting

from EMC Storage Arrays.

◆ Hosts booting from an EMC Storage Array are limited to the use

of one HBA.

◆ EMC recommends, although it is not required, that the

Symmetrix or CLARiiON device that is to contain the Master Boot

Record (MBR) for the host have a lower logical unit number

(LUN) than any other device visible to the host.

Note that this includes the following cases:

• Volume Logix database device when using Volume Logix in a

Symmetrix environment — The installer will fail to write the

MBR to this device, as it is write-protected.

– To force the installer to avoid an attempt to write to this

device, EMC recommends masking the LUN. The

administrative host must first initialize the Volume Logix

database. The LUN may then be masked by modifying the

active configuration file to enable the 'fba flag2' to restrict

access to the Volume Logix database.

– An alternative to masking the VCM DB is to map the

Volume Logix database device so that it is the highest LUN

presented to the host. Please be aware that the LUN

number should not be higher than 254 (FE).

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EMC QLogic Guide d'installation Page 62