4.2.7 RAID GROUPS OVERVIEW
RAID Groups allow Enter values in all fields and click
Create
to create the RAID Group.
FIELD
DEFINITION
RAID Group
Label
Enter an identifiable name for the RAID group. This value can be any string (up to 8 characters
including blank spaces) to help users identify this volume.
RAID Group
Select a Group ID from the available ID list. The maximum number of RAID Groups per controller is 8,
so Group ID can be any number between 0 and 7, inclusive.
Configuration
Select which RAID level is to be used to configure these members:
• Contiguous (for virtual disk).
• Concatenated (for multiple concatenated segments).
• Striped (for RAID 0)
• Mirrored (for RAID 1)
• Mirrored Striped (for RAID 10)
• Parity RAID (for RAID 5)
Capacity
Select a value to define the total usable capacity of the RAID Group or manually enter the volume size
in gigabytes (GB). Selecting MAX will create the largest RAID set possible with the drive(s) selected.
Chunk Size
Select a value to define the chunk size (stripe size) for performance tuning. In general, large stripe
sizes are best for large files that are accessed sequentially (for example, media streaming files) and
smaller sizes are better for randomly accessed data like databases. This parameter is not used for
Contiguous (JBOD), Concatenated, and Mirrored configurations.
Rebuild Priority
Select a value to identify how quickly the controller should rebuild data on a disk after a hardware
failure. A value of 1 is the lowest priority and will take the longest to rebuild. A value of 10 is the highest
priority and will rebuild the fastest, but may require more CPU resources, which might affect the
computer’s performance. This parameter is not used for Contiguous (JBOD), Concatenated, and
Striped configurations.
Check Pointing
Click the On or Off button to enable or disable the Check Pointing feature. When Check Pointing is
enabled, restoring data is very fast after an unexpected power loss, although normal performance may
be slightly reduced. When Check Pointing is disabled, normal performance is improved, but restores
can take a long time to complete. This selection is only available when the selected RAID configuration
is Mirrored, Mirrored Striped or Parity RAID, and the “Advanced RAID Features” checkbox in the
Configuration/Advanced Options dialog is checked.
Parity
Click the On or Off button to enable or disable the ability to return “dirty” data after an unexpected
power loss and all of the data could not be written to disk, rather than taking the volume off-line. This
selection is only available when the selected RAID configuration is Parity RAID and the “Advanced
RAID Features” checkbox in the Configuration/Advanced Options dialog is checked.
Devices
Select the RAID member devices from the available device segment grid. Up to five members can be
selected for Contiguous, Concatenated, Mirrored, Striped or Parity RAID modes (although Mirrored
RAID Groups will typically contain only two members). Exactly four members must be selected for
Mirrored Striped mode.
RAID Level
Min # of Disks
0
2
1
2
5
3
*
10
4
*
Contiguous
1
Concatenated
1
Once all parameters have been selected, select “Create” to create the RAID Group. When finished, press Cancel
to exit the Create RAID Group Dialog.
*
For 3132, this requires the use of a Port Multiplier device to access more than one disk per SATA channel.
DAS501t User’s Manual
Ver.071016
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