Fujitsu ETERNUS DX100 S4 Design Manual page 128

3. SAN Functions
Stable Operation via Load Control
The Primary storage and the Secondary storage must be from the same ETERNUS DX S4/S3
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series (*1). To use Storage Cluster for two storage systems from different ETERNUS AF/DX ser-
ies, contact your sales representative.
After an error occurs in the Primary storage or RAID group, while the Primary storage is being
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switched to the Secondary storage (max. 10 seconds), the Primary and Secondary storage can-
not be accessed. Therefore, business applications are expected to have a maximum I/O delay
response of 10 seconds.
Data mirroring between the Primary storage and the Secondary storage is performed by the
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Storage Cluster during normal operations. When a Write is performed from the server to the
Primary storage, data is also transferred to the Secondary storage, and after the transfer is
complete a Write completion is returned to the server. Therefore, when the Storage Cluster is
installed, the response degrades during a Write compared to an environment without the Stor-
age Cluster.
Using OPC or QuickOPC for Advanced Copy from a TFOV is recommended.
•
• In environments that use an iSCSI configuration, a switchover of the storage systems that is re-
quired for a failover or a failback takes from 30 seconds to 120 seconds to be complete. Server
I/O must also be restarted in some cases.
• The connection interface of business servers is FC or iSCSI (cannot be mixed). In addition, the
switch connection topology is supported.
• For details on the required environment for the Storage Cluster (OS, HBA, multipath driver, and
cluster software), refer to "Support Matrix".
*1 : An ETERNUS DX S4/S3 series refers to an ETERNUS AF S2 series, an ETERNUS AF series,
an ETERNUS DX S4 series, an ETERNUS DX S3 series, or an ETERNUS DX8000 S3 series.
Fujitsu Storage ETERNUS DX100 S4/DX200 S4, ETERNUS DX100 S3/DX200 S3 Hybrid Storage Systems Design Guide (Basic)
128
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