Huawei OceanStor 2000 V3 Series Features Manual page 29

OceanStor V3 Series
HyperMetro Feature Guide for Block
Figure 1-4 Without a HyperMetro consistency group
With a HyperMetro Consistency Group
If LUNs are added to a HyperMetro consistency group, no data is lost, as shown in
1-5.
Issue 05 (2018-01-30)
Local storage array
Before data changes
HyperMetro pair 01
Local
LUN01
HyperMetro pair 02
Local
LUN02
HyperMetro pair 03
Local
LUN03
After data changes
HyperMetro pair 01
Local
LUN01
HyperMetro pair 02
Local
LUN02
HyperMetro pair 03
Local
LUN03
Data recovery
HyperMetro pair 01
Local
LUN01
HyperMetro pair 02
Local
LUN02
HyperMetro pair 03
Local
LUN03
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Remote storage array
1. No consistency group is
·
Remote
LUN01
Remote
LUN02
·
Remote
LUN03
2. Synchronization fails, resulting
Remote
LUN01
Data synchronization fails
between two LUNs in
HyperMetro pair 02 due to a
fault of the HyperMetro pair.
Remote
Data synchronization
LUN02
succeeds between LUNs in
HyperMetro pairs 01 and 03.
Remote
LUN03
Remote
After the local storage array
LUN01
malfunctions due to a disaster,
data on the remote storage
array is used for data
recovery. Data in the database
Remote
of the local storage array is still
LUN02
invalid because data on the
three local LUNs are not
stored at the same point in
Remote
time.
LUN03
1 Feature Description
created.
Data, logs, and
modification information of
a database application are
stored on local LUN01,
LUN02, and LUN03
respectively.
No consistency group is
created on the local
storage array.
in data inconsistency.
3. Data becomes invalid.
Figure
21