Avago Technologies 3ware SAS 9750-16i4e - Manual (Page 126)

Chapter 7. Configuring Units
114 3ware SATA+SAS RAID Controller Card Software User Guide, Version 10.2
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:
• Units with Rapid RAID Recovery enabled will not be readable if moved
to controllers using pre-9.5.1 firmware. If you wish to move the unit to a
controller with pre-9.5.1 firmware, you must first disable Rapid RAID
Recovery.
• Units created on controllers with pre-9.5.1 firmware will not be able to
take advantage of Rapid RAID Recovery when the controller is updated
to 9.5.1 or later. These units will show Rapid RAID Recovery as disabled.
• Since the Rapid RAID Recovery feature tracks areas of the unit where
write activity occurs, file systems such as FAT, FAT32, NTFS, and XFS
are ideally suited to this implementation. For details on other file systems,
search the LSI KnowledgeBase for keyword 15462 at
: http://kb.lsi.com .
Protection against unclean shutdowns to provide a fast verification and
initialization is the same regardless of the file system.
Changing or disabling Rapid RAID Recovery
Rapid RAID Recovery can only be enabled (that is - set to All or Rebuild)
when the unit is created. You can change between All and Rebuild at any
time. However, if you disable Rapid RAID Recovery, you cannot then enable
it.
To change or disable Rapid RAID Recovery for an existing unit
through 3DM2
1 Choose Management >> Controller Settings from the menu bar in
3DM2.
2 In the Unit Policies section of the Controller Settings page, select All ,
Rebuild, or Disable from the Rapid RAID Recovery dropdown menu.