Raid Migration - Fujitsu Eternus2000 Manual

• SnapOPC
Unlike OPC, the SnapOPC just records changes as the data is updated.
SnapOPC is suitable for the following usages.
• Making temporary backup for tape backup
• Backup for less updated data
• SnapOPC+
As updates occur in the source data, SnapOPC+ saves the pre-change for each affected generation
level. Registering standby storage areas in the SDP allows SnapOPC+ copy sessions to continue even
when the amount of update data exceeds the copy destination capacity.
SnapOPC+ is suitable for the following usages.
• Making temporary backup for tape backup
• Backup for less updated data (generation management is available)
• EC (Equivalent Copy)
EC makes a mirror copy of the copy source to the copy destination beforehand, then suspends the copy
and treats all data as independent data.
When copying is Resumed, only updated data in the copy source is copied to the copy destination. If
the copy destination data has been changed, copy the copy source data again.
EC is suitable for the following usages.
• Making backup
• Making system test data replication
1.3.4

RAID Migration

RAID migration is a function that transfers a volume to a different RAID group with the data integrity
being guaranteed. By using RAID migration, RAID levels and volumes can be hot switched. This allows
easy redistribution of volumes among RAID groups in response to customer needs. RAID migration can be
carried out while the system is running, and may also be used to switch data to a different RAID level
changing from RAID5 to RAID1+0, for example.
The example of RAID migration is as follows:
P3AM-2512-03EN ETERNUS2000 disk storage system User Guide
Copyright 2009 FUJITSU LIMITED
Chapter 1 Overview
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