Accusys ExaRAID GUI - Manual (Page 71)

Using the RAID GUI
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To clear write buffers in the write cache of a logical disk, select a logical
disk and click the Flush button.
• Create logical disk (LD) snapshot volume pair
Instead of creating volume pairs in the Snapshot Volumes page, you can
directly create volume pair to a specified logical disk by clicking the
S.VOL button. Specify a virtual disk as the secondary volume from the SV
ID drop-down menu, then click the Apply button to confirm.
• Detailed logical disk information
Click to display a complete list of logical disk information. You will see
the following details.
Read Ahead
Multiplier This option specifies the read ahead multiplier for
the Always and Adaptive read ahead policies.
Select how much additional sequential data will
be pre-fetched. The default value is 8.
Read Logs This option specifies the number of concurrent
sequential-read streams for the Adaptive read
ahead policy, and the range is between 1 and
128. The default value is 32.
LD Read
Algorithm This option is only available for logical disks with
parity-based RAID level, i.e. RAID 3/5/6.
None: None of the algorithms will be used when
accessing data disks.
Intelligent Data Computation: The controller will
access logical disks within the shortest response
time. This greatly enhances read performance.
Fast Read Response: When this option is selected,
you are prompted to enter the maximum
response time for all read requests. The allowed
range for response time is 100 to 15000 msecs.
Check on Read: This option is similar to the Fast
Read Response. In addition to reading the
requested data from disks, the controller will also
perform parity check across corresponding strips
on each data disk.
• DG ID
• LD ID
• UUID
• Created Time and Date
• LD Read Algorithm
• Alignment Offset (sector)
• Write Cache Status
• Write Cache Setting
• Write Sorting
• Read Ahead Policy
• Read Ahead Multiplier
• Read Logs
• Member State