System information

Using the RAID GUI
2-18
• Modify JBOD disks
To modify a setting, select a JBOD and click Modify. Specify the following options for configuration.
To clear write buffers in the write cache of a JBOD disk, select a JBOD and click the Flush button.
• Create JBOD volume pair
Instead of creating volume pairs in the Snapshot Volumes page, you can directly create volume pair to a specified JBOD
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 JBOD disk information
Click to display a complete list of JBOD disk information. You will see the following details.
2.6.3 Disk groups
This feature allows you to create, delete, and modify your disk group settings.
• Create disk groups
Click Create to add a new disk group, where up to a maximum of 8 (single controller) / 32 (redundant controller model)
disk groups can be created. Specify the following options for configuration.
Name Type a name for the JBOD ID.
Preferred Controller This option is only available when the redundant-controller system is in use. Select
the preferred controller to be in charge of managing and accessing the JBOD disk.
However, the controller ownership will not change unless you check the ‘Change
owner controller immediately’ box.
Write Cache This option enables or disables the write cache of a JBOD disk.
Write Sorting This option enables or disables the sorting in the write cache. To improve writing
performance, it is recommended to turn this option on for random access. This
option is available only if the write cache is on.
Read Ahead Policy Always: The controller performs pre-fetching data for every read command from
hosts.
Adaptive: The controller performs pre-fetching only for host read commands that
are detected as sequential reads. The detection is done by read logs.
Off: If there is no sequential read command, read-ahead will result in overhead,
and you can disable the read-ahead.
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 read logs for the Adaptive read ahead policy.
The range is between 1 and 128. The default value is 32.
• JBOD ID
• UUID
• Created Time and Date
• Write Cache Status
• Write Cache Setting
• Write Sorting
• Read Ahead Policy
• Read Ahead Multiplier
• Read Logs
DG ID Select a DG ID from the drop-down menu.
Name Use the system default name as dgx. ‘x’ is the DG identifier.
OR
Uncheck the ‘Use system default name’ box and enter the name in the Name
field. The maximum name length is 63 bytes.
Members and Spares Select member disks and spare disks to be grouped.