Originally posted by: SystemAdmin

I have a 520 with a PCI-XDDR SCSI RAID Adapter (571B) connected to a totalstorage d24 with 24x146Gb disk. The 520 is runing AIX5.2 ML4 with some fixes from ML5 to made this hardware function correctly.

I want to create a RAID5 array using all 24 disk, but that exceeds the 1TB limit, what fixes do I need to create a 2TB raid array? I don't want to install a higher ML (for lots of complicated reason) unless I have no other choice.

Any suggestions?

Originally posted by: SystemAdmin

From 5300-05 Release Notes:
http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.resources/RELNOTES/5305_base_relnotes.htm

RAID capacity limitation
There are limits to the amount of disk drive capacity allowed in a single RAID array. Using the 32 bit kernel, there is a capacity limitation of 1 TB per RAID array. Using the 64 bit kernel, there is a capacity limitation of 2 TB per RAID array. For a RAID adapter and RAID enablement cards, this limitation is enforced by AIX when RAID arrays are created using the PCI-X SCSI Disk Array Manager. The adapters utilizing the PCI-X SCSI Disk Array Manager are:

PCI-X Dual Channel Ultra320 SCSI RAID Adapter (5703, 5711, 1975)
Dual Channel SCSI RAID Enablement Card (5709, 5726, 1976)
PCI-X Quad Channel U320 SCSI RAID Adapter (2780)
PCI-XDDR Dual Channel U320 SCSI RAID Adapter (5737, 1913)
Dual Channel SCSI RAID Enablement Card (5727, 5728, 1907)
Dual Channel SCSI RAID Enablement Card (1908)

When creating a RAID array up to 2 TB with Standalone Diagnostics, ensure that Version 5.3.0.40 or higher is used. Previous versions of the Standalone Diagnostics has a capacity limitation of 1 TB per RAID array.