Communicator e3000 MPE/iX Release 6.5 (Non-Platform Software Release C.65.00 (30216-90291)

Chapter 4 115
Data Center Management
HP SureStore E Disk Array 12H on the HP 3000
Off-line Diagnostics
There is a new off-line utility called ARDIAG that is supported within the support media
off-line (ODE) diagnostics. See chapter 7 of the HP SureStore E Disk Array 12H System
Administrators Guide for HP-UX, MPE/iX, and Microsoft Windows NT for how to use this
command.
Configuring the 12H for Performance on the HP 3000
• The single X controller is the only connection to the HP 3000 supported for this release.
It is recommended that you purchase the second Y controller in case of controller
failure. The second controller will be able to take over when swapped into place, for it
maintains a copy of the current firmware and disk maps
• If your 12H contains 12 18Gb disk drives we recommend configuring each of the LUNs
for 11Gb of storage. This has shown to give the best performance versus capacity. This
capacity allows for RAID1 and available space for two hot spare disks.
Total capacity of the LUNs should not exceed 90Gb. If this capacity is exceeded then
you will trade performance with capacity.
• Data Resiliency Mode should be set to Normal. Some users have reported slow times for
large restores. This problem can be corrected by setting the Data Resiliency Mode to
Performance Mode only during the restore. Remember to reset the mode back to
Normal when your large restore is completed.
• Rebuild Priority should be set to High. This may cause some degradation in OLTP but
will reduce the likelihood of encountering a disk mechanical failure while the system is
still recovering from a previous disk mechanical failure.