SATA II RAID Subsystem
58
User Manual
Initialization Mode:
Set the Initialization Mode for the Volume Set. Initialization in Foreground mode is
completed faster but must be completed before Volume Set becomes accessible.
Background mode makes the Volume Set instantly available but the initialization process
takes longer. No Init (To Rescue Volume) is used to create a Volume Set without
initialization; normally used to recreate Volume Set configuration to recover data.
Stripe Size:
This parameter sets the size of the stripe written to each disk in a RAID 0, 1, 10, 5 or
6 Volume Set. You can set the stripe size to 4KB, 8KB, 16KB, 32KB, 64KB, or 128KB.
A larger stripe size produces better-read performance, especially if your computer does
mostly sequential reads. However, if you are sure that your computer does random
reads more often, select a small stripe size.
NOTE: Stripe Size in RAID level 3 can’t be modified.
Volume Cache Mode:
The RAID subsystem supports two types of write caching: Write-Through and Write-Back.
Write-Through: data are both written to the cache and the disk(s) before the write
I/O is acknowledged as complete.
Write-Back: when data is written to cache, the I/O is acknowledged as complete,
and some time later, the cached data is written or flushed to the disk(s). This
provides better performance but requires a battery module support for the cache
memory, or a UPS for the subsystem.
Tagged Command Queuing:
When this option is enabled, it enhances the overall system performance under multi-
tasking operating systems by reordering tasks or requests in the command queue of
the RAID system. This function should normally remain enabled.
Max SCSI Speed:
The RAID subsystem supports 320 MB/sec as the highest data transfer rate.
SCSI Channel/SCSIID/SCSI LUN
SCSI Channe
l: The RAID subsystem supports one SCSI Channel or Dual SCSI
Channel.
SCSI ID
: Each SCSI device attached to the SCSI card, as well as the card itself,
must be assigned a unique SCSI ID number. A Wide SCSI channel can connect up
to 15 devices. The RAID subsystem is as a large SCSI device. We should assign an
ID from a list of SCSI IDs.
SCSI LUN:
Each SCSI ID can support up to 8 LUNs. Most SCSI host adapter treats
each LUN like a SCSI disk.
Volumes To Be Created:
Use this option to create several Volume Sets with the same Volume Set attributes. Up
to 128 Volume Sets can be created.
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