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Monitoring and Maintenance
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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
Speeds hard disk performance by writing data to the cache first and later
to the disk. Note that 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.