Fujitsu ETERNUS AF250 S2 - Redundant Copy; Figure 13 Redundant Copy Function

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Redundant Copy

Redundant Copy is a function that copies the data of a drive that shows a possible sign of failure to a hot spare.

When the Disk Patrol function decides that preventative maintenance is required for a drive, the data of the

maintenance target drive is re-created by the remaining drives and written to the hot spare. The Redundant

Copy function enables data to be restored while maintaining data redundancy.

Figure 13 Redundant Copy Function

Hot spare

Creates data from the drives other than

the maintenance target drive, and

writes data into the hot spare.

Disconnects the maintenance target drive

and switches it to the hot spare.

Disconnected

RAID5 (Redundant)

Sign of

failure

RAID5 (Redundant)

If a bad sector is detected when a drive is checked, an alternate track is automatically assigned. This drive is

not recognized as having a sign of drive failure during this process. However, the drive will be disconnected

by the Redundant Copy function if the spare sector is insufficient and the problem cannot be solved by assign-

ing an alternate track.

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Redundant Copy speed

Giving priority to Redundant Copy over host access can be specified. By setting a higher Rebuild priority, the

performance of Redundant Copy operations may improve.

However, it should be noted that when the priority is high and a Redundant Copy operation is performed

for a RAID group, the performance (throughput) of this RAID group may be reduced.

1. Function

Data Protection

FUJITSU Storage ETERNUS AF250 S2, ETERNUS AF250 All-Flash Arrays

Design Guide (Basic)

P3AG-1822-09ENZ0

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