3Ware 9550SXU-8LP User Guide - Page 152

Setting Unit Policies, details, see Setting Continue on Source Error During Rebuild

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Chapter 8. Configuring Units Setting Unit Policies The following polices are set when you create a unit, and can be adjusted later through settings on the Maintenance pages of 3DM and 3BM. Details about adjusting each policy are described on the following pages. • Unit Write Cache. Determines whether write cache is enabled for the unit. When the write cache is enabled, data is stored locally on the drive before it is written to disk, allowing the computer to continue with its next task. This provides the most efficient access times for your computer system. When disabled, the computer will wait for the drive to write all the data to disk before going on to its next task. This feature interacts with functionality of the BBU, if you have one, and with StorSave profiles on a 9550SX and 9590SE. For details, see "Enabling and Disabling the Unit Write Cache" on page 143. • Auto-Verify. Determines whether auto-verify is enabled for the unit (9000-series controllers only). When enabled, verify tasks are performed automatically when the firmware determines that one is needed. When disabled, you must manually specify when you want to verify a unit, even if you have set a verify schedule. For details, see "Setting Auto-Verify for a Unit" on page 145. • Continue on Source Error During Rebuild. Determines whether ECC errors are ignored when they are encountered during a rebuild (9000series controllers only). When not enabled, a rebuild will abort upon encountered an ECC error and the unit will be set to Degraded. For details, see "Setting Continue on Source Error During Rebuild" on page 146. • Queuing. Determines whether NCQ (Native Command Queuing) is enabled for the unit (9550SX and 9590SE controllers only). When enabled for drives that support it, this policy can improve performance. For details, see "Enabling and Disabling Queuing for a Unit" on page 147. • StorSave Profile. Determines what StorSave profile is used for the unit (9550SX and 9590SE controllers only). Three profiles are available: Protection, Balanced, and Performance. For details, see "Setting the StorSave Profile for a Unit" on page 149. Note: If the unit write cache is disabled, the StorSave Profile feature is disabled. 142 3ware Serial ATA RAID Controller User Guide

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Chapter 8. Configuring Units
142
3ware Serial ATA RAID Controller User Guide
Setting Unit Policies
The following polices are set when you create a unit, and can be adjusted later
through settings on the
Maintenance
pages of 3DM and 3BM. Details about
adjusting each policy are described on the following pages.
•
Unit Write Cache.
Determines whether write cache is enabled for the
unit. When the write cache is enabled, data is stored locally on the drive
before it is written to disk, allowing the computer to continue with its next
task. This provides the most efficient access times for your computer
system. When disabled, the computer will wait for the drive to write all
the data to disk before going on to its next task.
This feature interacts with functionality of the BBU, if you have one, and
with StorSave profiles on a 9550SX and 9590SE. For details, see
“Enabling and Disabling the Unit Write Cache” on page 143.
•
Auto-Verify.
Determines whether auto-verify is enabled for the unit
(9000-series controllers only). When enabled, verify tasks are performed
automatically when the firmware determines that one is needed. When
disabled, you must manually specify when you want to verify a unit, even
if you have set a verify schedule. For details, see “Setting Auto-Verify for
a Unit” on page 145.
•
Continue on Source Error During Rebuild.
Determines whether ECC
errors are ignored when they are encountered during a rebuild (9000-
series controllers only). When not enabled, a rebuild will abort upon
encountered an ECC error and the unit will be set to Degraded. For
details, see “Setting Continue on Source Error During Rebuild” on
page 146.
•
Queuing.
Determines whether NCQ (Native Command Queuing) is
enabled for the unit (9550SX and 9590SE controllers only). When
enabled for drives that support it, this policy can improve performance.
For details, see “Enabling and Disabling Queuing for a Unit” on
page 147.
•
StorSave Profile.
Determines what StorSave profile is used for the unit
(9550SX and 9590SE controllers only). Three profiles are available:
Protection, Balanced, and Performance. For details, see “Setting the
StorSave Profile for a Unit” on page 149.
Note:
If the unit write cache is disabled, the StorSave Profile feature is
disabled.