LSI 3ware SAS 9750-8i Uživatelská příručka stáhnout pdf (Strana 225)

Controller Settings page

www.lsi.com/channel/products 213

includes the Intelligent Read Prefetch (IRP) feature, which can improve

performance at higher queue depth in multiple read only or mixed read/write

stream environments. For additional information, see “Working with Read

Cache Settings” on page 111.

Auto Verify. Enabling Auto Verify ensures that a verify takes place following

either the Basic Auto Verify schedule or the Advanced Auto Verify schedule.

For details, see “Enabling or Disabling Auto Verify for a Unit” on page 115.

When Auto Verify is not enabled, verify tasks are only run if you manually

request one on the 3DM 2

Management page or in event of an unclean

shutdown.

Overwrite ECC (Continue on Source Error When Rebuilding). This policy

applies only to units which are redundant. (For units which are not redundant,

a check box is not available.) When this policy is set, ECC errors are ignored

when they are encountered during a rebuild. When this policy is not set, a

rebuild will abort upon encountering an ECC error and the unit will be set

back to Degraded.

Since this option could result in the loss of some source data in the event of

source errors, select this option only if you want to ensure that a rebuild will

complete successfully without manual intervention. If the rebuild fails and

Overwrite ECC is not selected, then you have the option to start a rebuild

manually. It is recommended that you execute a file system check when the

rebuild completes. Under Windows, you can do this by right-clicking on the

Drive and choosing Properties; then on the Tools tab, click Check Now. Under

Linux use the fsck utility command. For example,

fsck /dev/sda1.

Queuing. (Not applicable for SAS drives) This policy enables or disables

Native Command Queuing (NCQ) for SATA drives in the unit. By default,

queuing is disabled. You can enable it, if desired.

NCQ only operates when the feature is enabled at both the drive and the

controller. If a drive does not support NCQ, the policy setting for the

controller is ignored.

Enabling NCQ can improve performance in many applications; it causes

command reordering to be done on the drive itself.

StorSave Profile. The StorSave feature includes an option that lets you

change the StorSave Profile used for a unit. Three profiles are available:

Protection, Balanced, and Performance. These profiles automatically adjust

several different factors that affect protection and performance, including

whether FUA (Forced Unit Access) is honored, whether Write Journaling is

Note: The policy Overwrite ECC is equivalent to the “Continue on Source Error”

option in 3BM and the “IgnoreECC” option in the CLI.

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LSI 3ware SAS 9750-8i Uživatelská příručka Strana 225

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