SCSI mapping issues under RHEL6 U4 kernel

Issue

• Upgrading dell 720 hardware from kernel 2.6.32-279.el6.x86_64 to 2.6.32-358.2.1.el6.x86_64 introduces an issue with the order in which SCSI devices are mapped. The systems are using qlogic HBAs running from the qla2xxx driver. Under the updated kernel some of the LUNs made available from SAN storage are being processed and mapped before the onboard PERC H710P controller.

# uname -a
Linux hostname 2.6.32-279.el6.x86_64 #1 SMP Wed Jun 13 18:24:36 EDT 2012 x86_64 x86_64 x86_64 GNU/Linux
# lsscsi
[0:0:0:47]   disk    EMC      SYMMETRIX        5773  /dev/sdb
[0:0:0:129]  disk    EMC      SYMMETRIX        5773  /dev/sdc
[4:2:0:0]    disk    DELL     PERC H710P       3.13  /dev/sda
[9:0:0:0]    cd/dvd  PLDS     DVD-ROM DS-8D3SH HD51  /dev/sr0

# uname -a
Linux hostname 2.6.32-358.2.1.el6.x86_64 #1 SMP Wed Feb 20 12:17:37 EST 2013 x86_64 x86_64 x86_64 GNU/Linux
# lsscsi
[0:0:0:47]   disk    EMC      SYMMETRIX        5773  /dev/sda
[0:0:0:129]  disk    EMC      SYMMETRIX        5773  /dev/sdb
[4:2:0:0]    disk    DELL     PERC H710P       3.13  /dev/sdc
[9:0:0:0]    cd/dvd  PLDS     DVD-ROM DS-8D3SH HD51  /dev/sr0