Hitachi Compute Blade 2500 series, Compute Blade 500 series Installation Manual page 20

Note: You can use only an FC expansion card as the boot device. For
precautions about the use of FC, see Hitachi Gigabit Fibre Channel
Adapter User's Guide (BIOS/EFI) in advance.
Tip: If you use a shared fibre channel as a boot device, boot may not
complete depending on the number of LPARs assigned to the shared fibre
channel. To solve this problem, you can set a longer time for the LOGIN
DELAY TIME, which is the parameter that controls the operation of the
FC-SW module, although it may not work in some cases. For details, see
Hitachi Gigabit Fibre Channel Adapter User's Guide (BIOS/EFI).
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Installation Overview
Hitachi Compute Blade Series OS Installation Guide for Red Hat Enterprise Linux