Rapid Raid Recovery - 3Ware 9550SXU-12 User Manual

Configuring Units

Rapid RAID Recovery

126
5 Press to display the choices, use the
Enter
setting you want, and press
6 to the button and press
Tab OK
You return to the main 3BM screen.
7 When you are finished making changes, press
3BM.
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
. will apply the policy to both rebuilds and unclean shutdowns.
Disable All
will apply only to rebuilds.
Rebuild
initializations and verifies will take place on the entire unit, not just the active
sections. The default setting is
There is some system overhead from setting rapid recovery to
a BBU, you can set rapid recovery to
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.
3ware SAS/SATA RAID Software User Guide, Version 9.5.1
arrow keys
Enter again to choose it.
to select it.
Enter
(labeled Fast Rebuild/Shutdown in 3BM)
means that rebuilds,
Disable
.
All
Rebuild , as a BBU provides protection
to select the
to save them and exit
F8
, Rebuild
. If you have
All
or