Synology DS1821 Synology High Availability SHA User Guide for DSM 7.0 - Page 7

Number of network ports, Connection restrictions, Heartbeat connection - + 10gbe card

Get Synology DS1821 PDF manuals and user guides View all Synology DS1821 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 7 highlights

Chapter 1: Introduction Number of network ports Both hosts must have the same number of LAN ports. If your host is equipped with additional network interface cards, these network cards also count as additional LAN ports. Note: With a hybrid high-availability cluster, you can have a different number of built-in network ports on each host. Refer to this article for more details. Connection restrictions The servers cannot connect to the network via IPv6, PPPoE, or Wi-Fi. Please make sure to disable these functions before attempting to create a high-availability cluster. Heartbeat connection To ensure that the Heartbeat connection functions properly, the system will automatically confirm and adjust certain connection configurations during cluster setup. Refer to the information below for more details: • Other than the active and passive servers, there should be no other devices between the Heartbeat connection. • We highly recommend you to connect the two hosts directly without passing through any switches. • Make sure to use the fastest network interface on both hosts. For example, if one host is equipped with an additional 10GbE network card, the connection must also use an additional 10GbE network card. • A Heartbeat connection can transfer Jumbo Frame packets to the other Synology NAS using a specified network interface. If the connection passes through a switch, make sure that the switch also supports Jumbo Frame. • A Heartbeat connection requires low latency, and its response time should be less than 1 ms. • The connection speed of the Heartbeat connection must be faster than 50MB/s. • If the Heartbeat connection bandwidth is insufficient, the upload speed will be affected. Therefore, the bandwidth of the Heartbeat connection must be higher than the total sum of the bandwidths of all cluster connections. We recommend you to choose the fastest network interface, including Link Aggregation or 10G/40G network interface. Notes: • With a Heartbeat connection, two IP addresses (e.g., 169.254.1.1 and 169.254.1.2) will be generated for data synchronization between the active and passive server. Make sure that these IP addresses are not occupied by other devices in the network. • The Heartbeat interface does not support VLAN ID. • Traffic control on a switch may cause packet loss. To avoid this, make sure that traffic control is set to auto. 05

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
05
Chapter 1: Introduction
Number of network ports
Both hosts must have the same number of LAN ports. If your host is equipped with additional
network interface cards, these network cards also count as additional LAN ports.
Note:
With a
hybrid high-availability cluster
, you can have a different number of built-in
network ports on each host. Refer to
this article
for more details.
Connection restrictions
The servers cannot connect to the network via IPv6, PPPoE, or Wi-Fi. Please make sure to
disable
these functions before attempting to create a high-availability cluster.
Heartbeat connection
To ensure that the Heartbeat connection functions properly, the system will automatically
confirm and adjust certain connection configurations during cluster setup. Refer to the
information below for more details:
• Other than the active and passive servers, there should be no other devices between the
Heartbeat connection.
• We highly recommend you to connect the two hosts directly without passing through any
switches.
• Make sure to use the fastest network interface on both hosts. For example, if one host is
equipped with an additional 10GbE network card, the connection must also use an additional
10GbE network card.
• A Heartbeat connection can transfer Jumbo Frame packets to the other Synology NAS using
a specified network interface. If the connection passes through a switch, make sure that the
switch also supports Jumbo Frame.
• A Heartbeat connection requires low latency, and its response time should be less than 1 ms.
• The connection speed of the Heartbeat connection must be faster than 50MB/s.
• If the Heartbeat connection bandwidth is insufficient, the upload speed will be affected.
Therefore, the bandwidth of the Heartbeat connection must be higher than the total sum of
the bandwidths of all cluster connections. We recommend you to choose the fastest network
interface, including Link Aggregation or 10G/40G network interface.
Notes:
• With a Heartbeat connection, two IP addresses (e.g., 169.254.1.1 and 169.254.1.2) will be
generated for data synchronization between the active and passive server. Make sure that
these IP addresses are not occupied by other devices in the network.
• The Heartbeat interface does not support VLAN ID.
• Traffic control on a switch may cause packet loss. To avoid this, make sure that traffic
control is set to
auto
.