User manual

logiCAl drive mAnAgement
To view information about a logical drive and adjust parameters, follow
these steps:
1. From the Storage tab, click the Logical Drive menu item. The list
of logical drives will appear.
2. Move your pointer over the logical drive to display the available options.
• Click View to display information about a logical drive, or click
Settings to change its configuration. The table below explains the
meaning of each item in the information panel.
• Click Settings to change or delete the alias in the Alias field. You
can also configure the Read Policy (ReadCache, ReadAhead, or
NoCache) and Write Policy (WriteThru or WriteBack). Click the
Save button to save and apply the settings.
• Click Locate to identify physical drives. This feature will make the status
LEDs blink for one minute on all physical drives used in the disk array.
• Click Delete to remove a logical drive. If you choose this option
it will be necessary to confirm the deletion in a new dialog. Click
Confirm to delete the logical drive or Cancel to keep it.
• The Check Table option is used to display error tables used to
evaluate the integrity of the logical drive and determine if any
corrective action is needed.
Check
Table Item Description
Entry Number
A number assigned to each block of entry.
Table Type
Read Check, Write Check or Inconsistent Block.
Starting Logical
Block Address
Logical block address (LBA) of the first block for this
entry.
Count
Number of errors or continuous blocks starting from
this LBA.
Check Table display options
All
Display all errors
Read Check
Display Read errors
Write Check
Display Write errors.
Inconsistent
Block
Display inconsistent blocks for this logical drive. Mirror
data for RAID Levels 1, 1E and 10 or Parity data for RAID
Levels 5 and 6. Identified by the Redundancy Check.
Logical Drive
Information Description
ID
Logical drive identifier: LD0, LD1, etc.
Alias
This is the alias assigned through the Logical Drive
Settings menu.
Disk Array ID
Disk array identifier: DA0, DA1, DA2, etc.
RAID Levels
Lists the RAID level set when the logical drive was
created.
Operational Status
Displays the current state of the logical drive.
Capacity
Displays the data capacity of the logical drive.
Number of Axles
1 axle for most RAID levels; 2 axles for RAID 10.
Physical Capacity
Capacity of the disk array used by the logical drive.
Number of Physical
Drives
The number of physical drives in the disk array.
Stripe Size
Stripe size set when logical drive was created.
Read Policy
Adjustable in the Settings menu. See “Stripe Size”
on page 3333.
Sector Size
Sector size set when logical drive was created.
Write Policy
Adjustable in the Settings menu. See “Write Policy”
on page 3333.
Tolerable Number of
Failed Drives
Number of physical drives that can fail without the
logical drive going offline.
Synchronized
A new logical drive displays “No” until synchronizing
is completed.
Codec Scheme
n/a
Serial Number
Unique number assigned to this logical drive.
LDType
Displays the LD type of the logical drive (NAS or
iSCSI).
logiCAl drive problemS
Logical drive problems typically result from physical drive failures such
as a critical logical drive. The RAID controller can rebuild a critical
logical drive. A more serious but less common problem is an Incomplete
Disk Array, which results from a physical drive that fails or becomes
missing during RAID level migration or physical drive transport.
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