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servers for cold standby on page 201).
Grouping has a clear benefit: when you later specify which failover recording servers should take over from a
recording server, you select a group of failover recording servers. If the selected group contains more than
one failover recording server, this offers you the security of having more than one failover recording server
ready to take over if a recording server becomes unavailable. You can specify a secondary failover server group
that takes over from the primary group if all the recording servers in the primary group are busy. A failover
recording server can only be a member of one group at a time.
Failover recording servers in a failover group are ordered in a sequence. The sequence determines the order in
which the failover recording servers will take over from a recording server. By default, the sequence reflects
the order in which you have incorporated the failover recording servers in the failover group: first in is first in
the sequence. You can change this if you need to.
Hot standby failover recording servers
In a hot standby failover recording server setup, you dedicate a failover recording server to take over from one
recording server only. Because of this, the system can keep this failover recording server in a "standby" mode
which means that it is synchronized with the correct/current configuration of the recording server it is
dedicated to and can take over much faster than a cold standby failover recording server. As mentioned, you
assign hot standby servers to one recording server only and cannot group it. You cannot assign failover
servers that are already part of a failover group as hot standby recording servers.
Failover recording server validation
To validate a merge of video data from the failover server to the recording server, you
must make the recording server unavailable by either stopping the recording server
service or shutting down the recording server computer.
Any manual interruption of the network that you can cause by pulling out the network
cable or blocking the network using a test tool is not a valid method.
Failover recording server functionality (explained)
l
A failover recording server checks the state of relevant recording servers every 0.5 seconds. If a
recording server does not reply within 2 seconds, the recording server is considered unavailable and
the failover recording server takes over
Administrator manual | XProtect® VMS 2023 R1
38 | Overview
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