User manual

Promise Array Manager
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Rebuild Setting
High priority (box checked) assigns most of the system resources to
rebuilding. Rebuilding goes faster, restoring redundancy sooner but
read/write requests are handled slower.
Low priority assigns most of the system resources to handling read/write
requests. Read/write requests are handled at nearly normal speed while the
rebuild takes longer.
See Rebuild an Array later in this chapter for more information on the
rebuilding process.
Controller Setting
This feature applies to the SX6000 controller with the optional battery backup
unit. When Battery Backup Support is enabled and a power failure occurs,
the SX6000 will attempt to recover cached data from the SDRAM rather than
discarding it. This includes data waiting to be written to the hard drive at the
moment of the power failure.
Cache Setting
This option applies only when write-back cache is enabled (see Array
Options later in this chapter). Enter the maximum number of seconds data is
held in cache before being written to the hard drive, called flush frequency. A
longer period tends to increase apparent read/write performance but at a
greater risk of lost data should a power failure occur.
Disk Parameters: SMART Check
SMART, an acronym for Self-Monitoring Analysis and Reporting Technology,
is a feature of the disk drive software. It monitors the internal performance of
the drive and reports to the PC when it finds a potential failure. SMART
warns you of a developing drive failure so you can replace the drive before it
actually fails.
Disk Parameters: Enable Hard Disk’s Write Cache
Increases hard disk performance by writing data to the cache first and later
to the disk.
Caution
You can lose data if a power failure occurs while data is
still in the drive’s cache.
If any of these features are grayed out, it means they are not available on
your hard drives.