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Planning to Configure a Disk Drive

4-2 Peripherals Configuration (R1001H) HP-UX version 11.00.01

Planning to Configure a Disk Drive

Review the material discussed in this chapter for each kind of disk drive. The

correct device driver must be present in the kernel for the interface and disk device

you are installing. Once you have planned your disk configuration, proceed to the

“Managing Disk Devices” section.

Performance

Overall system performance depends partly on how your disks are arranged on

your system.

To optimize performance, consider the distribution of data on your disks.

If possible, use several smaller disks instead of a single, larger-capacity disk for all

disk needs. Configure a small sized disk (for example, 2 GB) to hold the / and

/usr file systems and any software applications. Use separate disks for user files,

database files, and any other storage that grows over time. This allows the system

to perform more efficiently by distributing I/O across spindles and shortens the

time for file system integrity check.

Mirror disks across buses to achieve maximum performance and fault tolerance.

Do not exceed Stratus-recommended guidelines for maximum number of disks

per interface card. Note too that the kind of disk access (random vs. sequential),

CPU overhead and total system capacity, cabling distance, disk-array

configuration, and block size all affect performance.

Consult your Stratus sales representative for information on performance

expectations, based on your predominant system I/O workload and disk

characteristics.

NOTE

Hewlett-Packard systems support CD-ROM drives in a similar manner

to disk drives. Continuum Series 400 systems support CD-ROM drives

on the external SCSI bus only. Therefore, configuration considerations

are different than those for Hewlett-Packard systems.

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Seagate ST118273WC Guía de usuario Pagina 50