Synology DS1821 Synology High Availability SHA User Guide for DSM 7.0 - Page 6

Volumes and disks, Network environment, Storage Manager, Volume - + ssd cache

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Volumes and disks • We recommend that the drive capacity of both hosts be identical. • The active and passive servers must have the same number of drives. Additionally, the drives must be placed in the exact same slots on each device. Refer to the image below for example: Chapter 1: Introduction The illustration above is for reference only. The number and size of disks in your environment may differ. • The hosts must not contain any SHR-formatted volumes. Go to Storage Manager > Volume to make sure that no SHR volumes exist. If there are SHR volumes, you must remove them before setting up a cluster. For information on how to change your RAID type, refer to this article. • To create an SSD cache on a SHA cluster, the memory capacity on each host must be identical. Network environment Network settings Make sure that your network settings meet the following requirements; otherwise, you may experience connection errors after performing a failover. • Both hosts must be assigned static IP addresses for the Cluster connection. • Both hosts must connect to the same network via the same network interface. For example, if one host connects to subnet A via LAN 1, the other host also must connect to subnet A via LAN 1. Note: NTP service will be automatically enabled on the active server once the high-availability cluster is created. 04

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04
Chapter 1: Introduction
Volumes and disks
• We recommend that the drive capacity of both hosts be identical.
• The active and passive servers must have the same number of drives. Additionally, the
drives must be placed in the exact same slots on each device. Refer to the image below for
example:
The illustration above is for reference only. The number and size of disks in your environment may differ.
• The hosts must not contain any SHR-formatted volumes. Go to
Storage Manager
>
Volume
to make sure that no SHR volumes exist. If there are SHR volumes, you must remove them
before setting up a cluster. For information on how to change your RAID type, refer to
this
article
.
• To create an SSD cache on a SHA cluster, the memory capacity on each host must be
identical.
Network environment
Network settings
Make sure that your network settings meet the following requirements; otherwise, you may
experience connection errors after performing a failover.
• Both hosts must be assigned static IP addresses for the Cluster connection.
• Both hosts must connect to the same network via the same network interface. For example,
if one host connects to subnet A via LAN 1, the other host also must connect to subnet A via
LAN 1.
Note:
NTP service will be automatically enabled on the active server once the high-availability
cluster is created.