Enhanced data reliability - Disk drive patrol

Data of ETERNUS AF/ETERNUS DX are protected via a disk drive patrol function. An internal controller regularly checks the disk drives, in background, to detect errors and write failures. This process also ensures that data consistency within the volume group^[1] is also maintained.

The data on each disk drive is read, and if an error is detected, data is reconstructed using redundant information contained within the volume group. The corrected data is then written to a new valid area on the disk drive.

• [1]
  Volume group is a group configured in a RAID.

• Benefit

  • Higher data reliability as data errors are quickly found and corrected (by reconstruction) and disk write failures are avoided.

  Product Requirements

  Supported Storages	All-Flash Arrays	ETERNUS AF150 S3 ETERNUS AF250 S3/S2, AF250 ETERNUS AF650 S3/S2, AF650 ETERNUS DX200F
  	Hybrid Storage Systems	ETERNUS DX60 S5/S4/S3 ETERNUS DX100 S5/S4/S3, DX200 S5/S4/S3 ETERNUS DX500 S5/S4/S3, DX600 S5/S4/S3 ETERNUS DX900 S5 ETERNUS DX8700 S3/S2, DX8900 S4/S3 ETERNUS DX60 S2, DX80 S2, DX90 S2 ETERNUS DX400 S2 series

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