Table of Contents
Advertisement
3.7.5.6.
SATA NCQ Support
RAID controller supports both SAS and SATA disk drives. The SATA NCQ allows multiple
commands to be outstanding within a drive at the same time. Drives that support NCQ have an
internal queue where outstanding commands can be dynamically rescheduled or re-ordered,
along with the necessary tracking mechanisms for outstanding and completed portions of the
workload. The SAS RAID controller allows the user to select the SATA NCQ support: "Enabled" or
"Disabled".
3.7.5.7.
HDD Read Ahead Cache
Allow Read Ahead (Default: Enabled)—When "Enabled", the drive's read ahead cache algorithm
is used, providing maximum performance under most circumstances.
3.7.5.8.
Volume Data Read Ahead
The volume read data ahead parameter specifies the controller firmware algorithms which
process the read ahead data blocks from the disk. The "Data Read Ahead" parameter is normal
by default. To modify the value, you must set it from the "Raid System Function" using the
'Volume Data Read Ahead" option. The default "Normal" option satisfies the performance
requirements for a typical volume. The "Disabled" value implies no read ahead. The most
efficient value for the controllers depends on your application. The "Aggressive" value is optimal
for sequential access but it degrades random access.
42
Advertisement
Table of Contents
