Synology SA3200D Synology High Availability SHA User Guide for DSM 7.0 - Page 8

Limitations, Package and software limitations, USB device limitations

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Link aggregation settings Both servers must use the same link aggregation settings for the data network and the Heartbeat connection. Once the high-availability cluster has been created, link aggregation settings cannot be modified. Notes: • If the Heartbeat connection is direct and does not pass through a switch, select IEEE 802.3ad Dynamic Link Aggregation or Balance XOR as the Link Aggregation mode. Otherwise, the Heartbeat connection may experience issues. • If the Heartbeat connection passes through a switch, select Adaptive Load Balancing or Balance XOR as the Link Aggregation mode and disable IEEE 802.3ad (Dynamic) Link Aggregation (LACP, 802.1AX) on the switch. • Once a high-availability cluster has been created, the bond selected for the Heartbeat connection will automatically enter "round-robin" mode to provide support for auto failover and load balancing. The bond will return to its initial configuration if the cluster is destroyed. Open vSwitch settings The status of Open vSwitch must be the same on both servers (enabled or disabled). Open vSwitch settings can still be modified after the high-availability cluster is created. 2.3 Limitations Package and software limitations Once the high-availability cluster is formed, the following packages and features will no longer be available: • PetaSpace • Migration Assistant • The ability to restart/shut down the high-availability cluster in Synology Central Management System (CMS). • The cluster feature for Virtual Machine Manager • The cluster feature for Synology MailPlus Server • Synology Directory Server should be configured after cluster creation. If you have already installed Synology Directory Server prior to cluster creation, refer to the Create a cluster with a Synology NAS in use section for instructions. USB device limitations SHA does not support switchover/failover for USB devices. Any services or applications provided by USB devices may not work properly after switchover/failover. Note: If you have encrypted shared folders and have chosen a USB device for the Key store location in its Key Manager, but you want the shared folder to be mounted automatically after switchover/failover, follow the instructions in this article. 06 Chapter 1: Introduction

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06
Chapter 1: Introduction
Link aggregation settings
Both servers must use the same link aggregation settings for the data network and the
Heartbeat connection. Once the high-availability cluster has been created, link aggregation
settings cannot be modified.
Notes:
• If the Heartbeat connection is direct and does not pass through a switch, select
IEEE
802.3ad Dynamic Link Aggregation
or
Balance XOR
as the Link Aggregation mode.
Otherwise, the Heartbeat connection may experience issues.
• If the Heartbeat connection passes through a switch, select
Adaptive Load Balancing or
Balance XOR
as the Link Aggregation mode and disable
IEEE 802.3ad (Dynamic) Link
Aggregation (LACP, 802.1AX)
on the switch.
• Once a high-availability cluster has been created, the bond selected for the Heartbeat
connection will automatically enter “
round-robin
” mode to provide support for auto
failover and load balancing. The bond will return to its initial configuration if the cluster is
destroyed.
Open vSwitch settings
The status of
Open vSwitch
must be the same on both servers (enabled or disabled).
Open
vSwitch
settings can still be modified after the high-availability cluster is created.
2.3 Limitations
Package and software limitations
Once the high-availability cluster is formed, the following packages and features will no longer
be available:
• PetaSpace
• Migration Assistant
• The ability to restart/shut down the high-availability cluster in Synology Central Management
System (CMS).
• The cluster feature for Virtual Machine Manager
• The cluster feature for Synology MailPlus Server
•
Synology Directory Server
should be configured
after
cluster creation. If you have already
installed
Synology Directory Server
prior to cluster creation, refer to the
Create a cluster
with a Synology NAS in use
section for instructions.
USB device limitations
SHA does not support switchover/failover for USB devices. Any services or applications
provided by USB devices may not work properly after switchover/failover.
Note:
If you have encrypted shared folders and have chosen a USB device for the
Key store
location
in its
Key Manager
, but you want the shared folder to be mounted automatically
after switchover/failover, follow the instructions in
this article
.