3.1.5 Fast Recovery
This function recovers data quickly by relocating data in the failed drive to the other remaining drives when a
drive error is detected.
A RAID level (RAID6-FR) that preserves reserved areas equivalent to hot spares in a RAID group is used.
Figure 3.5 Fast Recovery
Failed drive
RAID6-FR ((3D+2P) × 2)
RAID6-FR (No redundancy)
: Redundant data for area A
of the failed drive
: Redundant data for area B
of the failed drive
: Fast recovery Hot Spare (FHS)
Failure
RAID6-FR ((3D+2P) × 2 + 1HS)
High Speed Rebuilding
(Creating data and writing to the FHS area simultaneously)
Disconnect
RAID6-FR (Redundant)
A failed drive is disconnected from the
ETERNUS DX.
Data is created from the redundant data
in normal drives and written to reserved
space (FHS) in RAID6-FR.
3.1.6 Protection (Shield)
The Protection (Shield) function diagnoses temporary drive errors. A drive can continue to be used if it is de-
termined to be normal. The target drive temporarily changes to diagnosis status when drive errors are detec-
ted by the Disk Drive Patrol function or error notifications.
For a drive that configures a RAID group, data is moved to a hot spare by a rebuild or redundant copy before
the drive is diagnosed.
For a drive that is disconnected from a RAID group, whether the drive has a permanent error or a temporary
error is determined. The drive can be used again if it is determined that the drive has only a temporary error.
The target drives for the Protection (Shield) function are all the drives that are registered in RAID groups or
registered as hot spares. Note that the Protection (Shield) function is not available for unused drives.
Chapter 3 Functions
3.1 Data Protection
28
FUJITSU Storage ETERNUS DX60 S3 Disk storage system
Overview
Copyright 2014 FUJITSU LIMITED
P3AM-8972-01ENZ0
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