Multipath LUNs (paths) do not show up, or show up very late on RHEL 5.6 - Red Hat Customer Portal

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Issue

After update server from RHEL 5.5 to 5.6 I have problem - periodically (after reboot) partitions from array (Hitachi AMS2500) do not come to server, I can't see them from fdisk and from multipath -ll.
When my server work on RHEL 5.5 all partitions come correctly.

Setup

BladeCenter HS22 blade with
two QLogic 2532 (or 2572) fibre channel HBAs
- 24:00.0 Fibre Channel: QLogic Corp. ISP2532-based 8Gb Fibre Channel to PCI Express HBA (rev 02)
  24:00.1 Fibre Channel: QLogic Corp. ISP2532-based 8Gb Fibre Channel to PCI Express HBA (rev 02)
Brocade 5470 Switch Module, aka Brocade 8GbSAN Switch Module for IBM BladeCenter

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