Figure 3-2
Tolerance of single points of failure
Application
server A
Cluster
Storage array
Controller A
Controller B
Heartbeat cable
Normal
Failure point
Abnormal
Data flow in normal cases
Data flow in abnormal cases
Application
server B
Application
server A
Controller A
Controller B
Heartbeat cable
Data
channel
Network
Application
server B
Network
Data
channel
Cluster
Storage array
Physical link
, application server A and controller A are faulty, so a link
between the cluster and the storage system is down. Under this circumstance, the redundant
components and links compensate for the failed ones. This ensures the nonstop system
operations and greatly improves the service availability.
Resilience Against Disasters
The OceanStor 2600 V3 storage system compliments various data protection methods for
backup and disaster recovery. Those methods eliminate the risks of unexpected downtime and
data loss caused by natural disasters, serious device failures, or man-made misoperations.
The supported data protection methods include:
l
Backup
The storage system processes a huge amount of data, and the loss of any data can lead to
a disastrous result. Therefore, enterprises are used to periodically backing up their
critical data. The following backup technologies are most commonly used because they
complete data backup in a hitless manner:
–
Snapshot: locally generates a virtual duplicate for a source LUN at a specified point
in time. The duplicate is immediately usable and any access to it will have no
impact on the source LUN data.
–
Clone: locally generates a complete copy for a source LUN at a specified point in
time. After the clone task, the destination LUN stores the same data as the source
LUN, and their relationship can be split. Then any access to the destination LUN
has no impact on the source LUN data.
–
LUN copy: replicates data from the source LUN to the destination LUN at block
level. A LUN copy task can be performed within a storage system or among storage
systems (even if they are heterogeneous).
OceanStor 2600 V3
Product Description
3 Typical Applications
Issue 09 (2019-05-15)
Copyright © Huawei Technologies Co., Ltd.
13