LSI 3ware SAS 9750-8i Betriebsanweisung PDF herunterladen (Seite 133)

Setting Unit Policies

www.lsi.com/channel/products 121

The current setting—Protection, Balanced, or Performance—is shown.

(The default setting is Balanced.)

5 Press

Enter to display the choices, use the arrow keys to select the

setting you want, and press

Enter again to choose it.

Tab to the OK button and press Enter to select it.

You return to the main 3BM screen.

7 When you are finished making changes, press

F8 to save them and exit

3BM.

Rapid RAID Recovery

The Rapid Raid Recovery feature increases the speed with which a redundant

unit can be made redundant again when a rebuild is required. It can also

increase the speed of verification or initialization that may occur in the event

of an unclean shutdown.

Rapid RAID Recovery is possible because the firmware maps the unit, and

tracks the areas of the unit where write activity occurs. Then, if a rebuild,

initialization, or verify is required, the controller only has to address the active

areas. The fewer active areas, the faster the rebuild, initialize or verify.

Since the units are mapped out and tracked from the creation of the unit, this

feature can only be enabled during unit creation. Also, once disabled, it

cannot be re-enabled.

The more space is available on a unit, the more benefit you will see in the

event of a rebuild, if you enable Rapid RAID Recovery. If all of a unit’s

capacity is being used, you may not see reduction of rebuild speed when using

Rapid RAID Recovery. However, Rapid RAID Recovery still provides

benefits to unit verification and to initialization after an unclean shutdown,

regardless of the disk usage.

Possible settings are

All (labeled Fast Rebuild/Shutdown in 3BM), Rebuild or

Disable. All will apply the policy to both rebuilds and unclean shutdowns.

Rebuild will apply only to rebuilds. Disable means that rebuilds,

initializations and verifies will take place on the entire unit, not just the active

sections. The default setting is

All.

There is some system overhead from setting rapid recovery to

All. If you have

a BBU, you can set rapid recovery to

Rebuild, as a BBU provides protection

against data loss in the event of an unclean shutdown.

Some limitations of Rapid RAID Recovery:

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LSI 3ware SAS 9750-8i Betriebsanweisung Seite 133

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