SurfRAID TRITON 16Ni, Руководство пользователя

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Chapter 11 proNAS HA (Optional Feature)
11.1 Introduction to proNAS HA
The SR-TRITON16Ni proNAS HA (High Availability) provides solution for business continuity with
automatic failover which ensures that should a critical server become unavailable - due to failure or
maintenance-related downtime — a replica will immediately provide all services in its place without
the need for time-consuming manual procedures.
The HA feature is licensed feature and can be
initially setup and started, but only for limited time and will expired and will disable the
feature. Please contact your Partners Data System account manager or our support team for
enabling this feature permanently.
The core processes of ProNAS HA are implemented as two mutual-guarded fail-safe proNAS
services. They can be manipulated by accessing the Services tab in the proNAS System Manager
node. The dual service architecture of ProNAS HA prevents ProNAS HA from being the single-
point-of-failure of the server cluster.
When a server is down or unavailable, ProNAS HA switches the critical operations of that server
over to the peer server automatically. The switch over procedure can also be triggered manually to
handle scheduled downtime more gracefully and user transparently. ProNAS HA can be manually
instructed to switch over the critical operations of a server to the peer server. Users can then
perform upgrade, replacement, or maintenance to the hardware and software of that proNAS server.
The critical operations of a server can be configured as auto-switch back. After those critical
operations were taken over by the peer server, ProNAS HA can switch them back to their original
active server when the active server becomes available again. Auto-switch back ensures that the
original load distribution between the two servers will be resumed immediately when possible.
SR-TRITON16Ni proNAS HA provides:
Manual or auto-triggered failover to a standby server.
Supports manual or automatic failover back to the original server when ready
Real-time replication minimizes potential data loss
NOTE: SR-TRITON16Ni proNAS OS version 1.3.xx supports Replication of
Logical Volumes with LV capacity up to 16TB. proNAS HA also has the same
LV size limit, which means all logical volumes in proNAS (under HA) must not
exceed 16TB.