Configuring Units126 3ware SAS/SATA RAID Software User Guide, Version 9.5.15 Press Enter to display the choices, use the arrow keys to select thesetting you want, and press Enter again to choose it.6 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 exit3BM.Rapid RAID RecoveryThe Rapid Raid Recovery feature increases the speed with which a redundantunit can be made redundant again when a rebuild is required. It can alsoincrease the speed of verification or initialization that may occur in the eventof an unclean shutdown.Rapid RAID Recovery is possible because the firmware maps the unit, andtracks 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 activeareas. 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, thisfeature can only be enabled during unit creation. Also, once disabled, itcannot be re-enabled.If all of a unit’s capacity is being used, there is no real advantage to RapidRAID Recovery, but the more your unit’s capacity is under-utilized, the lesstime a rebuild, initialization or verify will take if you enable Rapid RAIDRecovery.Possible settings are All (labeled Fast Rebuild/Shutdown in 3BM), Rebuild orDisable. 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 activesections. The default setting is All.There is some system overhead from setting rapid recovery to All. If you havea BBU, you can set rapid recovery to Rebuild, as a BBU provides protectionagainst 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 NTFSfile systems. Linux or FreeBSD file systems such as Ext3 are not yetsupported.
