AMCC 3ware 9650SE-2LP Guía de usuario descargar pdf (Pagina 138)

Configuring Units

126 3ware SAS/SATA RAID Software User Guide, Version 9.5.1

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.

If all of a unit’s capacity is being used, there is no real advantage to Rapid

RAID Recovery, but the more your unit’s capacity is under-utilized, the less

time a rebuild, initialization or verify will take if you enable Rapid RAID

Recovery.

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:

• Currently Rapid RAID Recovery only works with FAT, FAT32 and NTFS

file systems. Linux or FreeBSD file systems such as Ext3 are not yet

supported.

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AMCC 3ware 9650SE-2LP Guía de usuario Pagina 138