Compaq StorageWorks HSG60 ACS Solution Software V8.6 for Compaq Tru64 UNIX Installation and Configuration Guide

2–26 HSG60 ACS Solution Software Version 8.6 for Compaq Tru64 UNIX Installation and Configuration Guide
Increasing Sequential Write Performance
Sequential write and read requests on stripesets (or striped mirrorsets), should use a
small chunk size relative to the I/O size to increase the performance. A chunk size of
17 generally works well.
Save Configuration
This switch is for a single-controller configuration only. This switch reserves an area
on each of the disks that constitute the container being initialized. The controller can
write subsystem configuration data on this area. If the controller is replaced, the new
controller can read the subsystem configuration from the reserved area of disks.
If you specify
SAVE_CONFIGURATION for a multi-device storageset, such as a stripeset, the
complete subsystem configuration is periodically written on each disk in the
storageset.
CAUTION: If user data already exists on a storageset, do NOT reinitialize it with the
save configuration option, as this will change the site and position of the user data on
the storageset. Compaq recommends backing up user data prior to reinitializing any
storageset.
The SHOW DEVICES FULL command shows which disks are used to backup configuration
information.
Destroy/Nodestroy
Specify whether to destroy or retain the user data and metadata when a disk is
initialized that has been previously used in a mirrorset or as a single-disk unit.
NOTE: The DESTROY and NODESTROY switches are only valid for mirrorsets and
striped mirrorsets.
■ DESTROY
(default) overwrites the user data and forced-error metadata on a disk drive
when it is initialized.
■ NODESTROY preserves the user data and forced-error metadata when a disk drive is
initialized. Use
NODESTROY to create a single-disk unit from any disk drive that has
been used as a member of a mirrorset. See the REDUCED command in the
Compaq StorageWorks HSG60 Array Controller ACS Version 8.6 CLI Reference
Guide for information on removing disk drives from a mirrorset.
NODESTROY is ignored for members of a RAIDset.