HP StorageWorks Disk Array XP operating system configuration guide: MPE/iX (A5951-96145, November, 2005)

Determining storag

e capacit y per path

An important diffe

rence bet ween MPE/iX and other operating systems (such as HP-UX)

is the determinat

ion of disk capacity on a path. MPE/iX is very sensitive to spindle

count (LUNs) per path. If this count exceeds 16 per bus or path, performance problems

may result.

To determine the a

vailable storage capacity in a path, subtract required system and

application I/O

space from the total disk capacity and d ivide the result by the spindle

count (number of LUNs) in the path.

If performance information isn’t available, create a conﬁguration similar to the

installation you had before migrating to the XP array, but be sure not to exceed 16

LUNs per path. Exceeding this number may cause MPE/iX to issue more I/O requests

than the XP arr

ay can service.

Load the OS software

For an existing host requiring an OS update before installing the array, follow the

instructions in the HP e3000 MPE/iX System Software Maintenance Manual to install or

to upd ate the OS.

TheOSmustbeMPE/iX7.0orMPE/iX7.5.

If you are installing a new MPE/iX OS onto an XP disk array that will serve as the

boot disk (MPE/iX Ldev 1), refer to Appendix B. The appendix provides instructions

for obtaining the required primary boot path of that disk array device. Setting the

primary boot path into the processor’s PDC memory is a required ﬁrst step for OS

software installation.

If, however, you are installing or updating an OS not using a newly connected XP disk

array as Ldev 1, d etermine the primary b oot path by the normal HP e3000 methods (for

example, ODE> run MAPPER or MAPPER2 or by using fcscan).

Conﬁgure the disk array devices in MPE/iX

Use either the SYSGEN utility program or the IOCONFIG utility command to perform

I/O con ﬁguration of the new XP disk array devices for the MPE/iX OS.

The SYSGEN utility allows you to prepare a new I/O conﬁg uration for the system, but

the new conﬁguration does not take effect until the system is rebooted.

The IOCONFIG command prepares a new I/O conﬁguration and puts it into effect

immediately, while the system is up, without a reboot.

Both co

nﬁguration utilities execute in the normal MPE/iX system environment while the

system

is up and running. Therefore you must boot and start the OS from the MPE/iX

Ldev 1

boot disk before you can perform conﬁguration.

Installation