Synology DS1821 Synology High Availability SHA User Guide for DSM 7.1 - Page 6

Volumes and disks, Storage Manager, Volume, Contact Customer Service - + ssd cache

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Chapter 2: Required Environment 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. • Both hosts must support Peta Volume in order to create a Peta Volume on a hybrid highavailability cluster. • When creating a hybrid high-availability cluster, if you receive an error message saying that the passive server does not support the volumes on the active server, refer to Chapter 3: Contact Customer Service in the Synology High Availability (SHA) Troubleshooting Guide to contact technical support. 04

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04
Chapter 2: Required Environment
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.
• Both hosts must support
Peta Volume
in order to create a Peta Volume on a hybrid high-
availability cluster.
• When creating a hybrid high-availability cluster, if you receive an error message saying that
the passive server does not support the volumes on the active server, refer to
Chapter
3: Contact Customer Service
in the
Synology High Availability (SHA) Troubleshooting
Guide
to contact technical support.