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Limitations
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Configuring a Boot Device on an EMC Storage Array
Limitations
This section discusses limitations, including:
◆ “Common limitations” on page 145
◆ “Symmetrix-specific limitations” on page 146
◆ “CLARiiON-specific limitations” on page 147
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.
◆ For RHEL4 U4, 4 Gb adapter 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.
◆ EMC recommends, although it is not required, that the
Symmetrix, VNX series, 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.