Emulex LightPulse LPe1105-M4 HBA Guía de instalación descargar pdf (Pagina 125)

Limitations

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Configuring a Boot Device on an EMC Storage Array

◆ The Symmetrix, VNX series, or CLARiiON device that is to

contain the Master Boot Record (MBR) for the host must have a

lower logical unit number (LUN) than any other device visible to

the host. This device must be mapped as

/dev/sda by the Linux

operating system for the boot to succeed from the device.

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 However, please be aware that the

LUN number should not be higher than 254 (FE) if it is to

be used by Solutions Enabler or EMC ControlCenter

running on a Microsoft host.

Note: The EMC-recommended method is to use LUN masking.

• VNX series or CLARiiON ghost LUN — If no LUN 0 exists in

the storage group, a phantom device (LUNZ) will be

presented by the array in its place. Additionally, a valid LUN 0

presented via an inactive path acts as a not-ready device.

Always ensure that a valid LUN 0 is present in the storage

group and that it is owned by the SP connected to the boot

HBA. If the boot LUN trespasses, a system crash may result.

◆ When attaching the Linux host to an EMC storage array, use the

adapter in the lowest-numbered PCI slot in the server. To keep the

configuration and installation simple, it is recommended that

only that single HBA be cabled to the array. Ensure that the boot

BIOS or firmware has been applied to your HBA.

◆ The installer installs the boot block onto only the first disk it sees.

This includes SCSI and IDE drives in your system. If only EMC

storage array devices are attached to the system, the boot BIOS

should be set to the first LUN the HBA sees. If there are other

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Emulex LightPulse LPe1105-M4 HBA Guía de instalación Pagina 125