HP-UX Reference (11i v1 05/09) - 1M System Administration Commands N-Z (vol 4)

newarray(1M) newarray(1M)

the ﬁle system conﬁguration and application be compatible with the array conﬁguration.

Your choice of segment size directly affects the performance of the disk array. Choose this parameter in

concert with the choice of the parameters used when building the ﬁle system on the device. In general, the

segment size determines how much data from a single I/O will be stored on a single disk within the array.

A smaller value will involve more of the disks with the I/O, whereas a larger value will involve fewer disks.

If input/output operations tend to be very long, the involvement of multiple disks may hasten the comple-

tion of each I/O. In this case the access time is the same as a single disk, but the disk data transfer time is

shared across the set of disks. If input/output operations are short, the access time will dominate relative

to the disk data transfer time, and more input/output operations may be processed in parallel by involving

fewer disks in each I/O.

In all cases the relative locality of data and the access pattern will affect the performance. For highly

sequential data, it may be advantageous to locate the data for a single I/O on a single disk, to take advan-

tage of read-ahead caching within each disk.

Conﬁgurations for the HP C2430 disk array should enable the automatic data reconstruction LUN ﬂag as

part of the conﬁguration speciﬁcation.

Supported Array Products:

The HP C2425 and HP C2427 disk arrays are only supported on Series 700 systems running HP-UX version

9.0X.

The HP C2430 disk array is supported on Series 700 and 800 systems running HP-UX versions 9.0X and

10.0X.

AUTHOR

newarray was developed by HP.