3Ware 9550SXU-16ML User Guide - Page 228

Chapter 11. Troubleshooting 005h Rebuild completed The 3ware RAID controller has successfully completed a rebuild. The completion of the rebuild changes the state of the array from rebuilding to OK. The data is now redundant. 006h Incomplete unit detected At power-on initialization time, or during a rescan, the 3ware RAID controller performs a "rollcall" of all drives attached to the card. After detection of the drives, the 3ware RAID controller then uses an internal algorithm to logically connect drives that belong to the same array. If after rollcall a member of an array is not found, the INCOMPLETE UNIT AEN is sent. Examples of incomplete units are as follows: „ 3-drive or larger RAID 5 unit with two or more drives missing. This also applies to RAID 5 units that are part of a RAID50 unit. „ 4-drive RAID 10 unit with three drives missing. Replacing the missing or dead drive and initiating a rebuild will change the state of the array from an incomplete unit to OK. No rebuild is required if you replace the missing drive before loading the driver. 007h Initialize completed The 3ware RAID controller has completed the initialization sequence of RAID levels 1, 10, 5, or 50. For RAID 5 and RAID 50, the data on the array is read and the resultant parity is written to the parity area on the array. For RAID 1 and 10, one half of the mirror is copied to the other half (mirrors are synchronized). 008h Unclean shutdown detected The 3ware RAID controller has the ability to detect if the system has been shutdown via the standard shutdown mechanism of the operating system (clean shutdown). If the system loses power or is reset without going through the normal shutdown procedure, it is possible that the data on a redundant array may be out of synchronization. The unclean shutdown detection will detect this case and force the array to enter the rebuilding state. This has the effect of synchronizing the array back to a fully redundant state. To prevent unclean shutdowns, the user should always go through the normal shutdown procedure for the operating system in use and use an uninterruptible power supply (UPS) to prevent unclean shutdowns due to sudden power loss. 009h Drive timeout detected The 3ware RAID controller has a sophisticated recovery mechanism to handle various types of failures of a disk drive. One such possible failure of a disk 218 3ware 9550SX Serial ATA RAID Controller User Guide