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  7. Fast Recovery - for highly reliable 24 hour non-stop operation

Fast Recovery - for highly reliable 24 hour non-stop operation

Rebuild is a process that restores the contents of the failed disk from the remaining normal disks. If a hot spare disk (HS) is installed when a disk failure occurs, the rebuild process is performed from the hot spare and redundancy is restored.

Fast Recovery is a technology to shorten the rebuild time. No exclusive hot spare disk is available, but a reserved area for rebuild is prepared in each disk in the RAID group, as shown in the figure below.

When a disk failure occurs, rebuild on reserved areas in multiple disks are performed simultaneously, unlike the traditional rebuild function where it is carried out disk by disk. This reduces the rebuild time for a 1TB disk to 90 minutes instead of 9 hours with traditional rebuild. RAID-6 is supported. Fast Recovery requires copy-back after a disk has been replaced.



  • Prevents interruptions to business operations due to server problems
  • Enables highly reliable 24 hour non-stop operation

Product requirement

Supported Storages All-Flash Arrays ETERNUS AF250 S2/AF250
Hybrid Storage Systems ETERNUS DX60 S4/S3
ETERNUS DX100 S4/S3, DX200 S4/S3
ETERNUS DX500 S4/S3, DX600 S4/S3
ETERNUS DX8700 S3, DX8900 S4/S3