Fujitsu ETERNUS AF250 Design Manual page 107

1. Function
Stable Operation via Load Control
Item
Copy path (connection between storage systems)
The maximum configurable capacity (per storage system) (*1)
Maximum number of TFO groups (per ETERNUS AF)
Failover
Failback
Automatic failover triggers
Storage Cluster Continuous Copy (*2)
¡: Possible, ´: Not possible
*1: The total available capacity of TFOVs for a ETERNUS AF can be expanded by setting an expansion for the
total capacity of TFOVs. If the installed memory is not sufficient, the expansion setting cannot be per-
formed.
For details on setting an expansion for the total capacity of TFOVs, refer to "ETERNUS CLI User's Guide".
*2: Storage Cluster Continuous Copy is an ETERNUS DX/AF function that performs a copy on the Primary storage
and the Secondary storage simultaneously, and achieves consistency between the two storage systems.
This is achieved by operating Advanced Copy from a TFOV to a TFOV.
• After an error occurs in the Primary storage or RAID group, while the Primary storage is being switched to
the Secondary storage (max. 10 seconds), the Primary and Secondary storage cannot be accessed. There-
fore, 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 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 Storage 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 required for a
•
failover or a failback takes from 30 seconds to 120 seconds to be complete. Server I/O must also be restar-
ted in some cases.
The connection interface of business servers is FC or iSCSI (cannot be mixed). In addition, the switch con-
•
nection topology is supported.
For details on the required environment for the Storage Cluster (OS, HBA, multipath driver, and cluster soft-
•
ware), refer to "Support Matrix".
Automatic
Manual
Automatic
Manual
ETERNUS DX/AF failure
Power failure/shutdown
RAID failure/RAID blockage
CA port link down
FUJITSU Storage ETERNUS AF250 S2, ETERNUS AF250 All-Flash Arrays Design Guide (Basic)
Copyright 2019 FUJITSU LIMITED
Specifications
Direct connection and remote connection
2,048TB
32
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P3AG-1822-09ENZ0