Synology DS920 Synology High Availability SHA Troubleshooting Guide for DSM 7. - Page 50

Synology High Availability, Online Assemble

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Chapter 2: SHA Troubleshooting 2. Install the drive into the correct slot on the active server. If the read/write cache is also lost, make sure that the drive that the read/write cache is on is also installed correctly. 3. Go back to Storage Manager > Storage, and click on the storage pool to expand its information. 4. Click the upper-right icon and select Online Assemble.2 Re-create the volume If the volume cannot be repaired using the methods above, you can perform a force failover to make the passive server take over services. 1. Go to Synology High Availability > Cluster and click force failover in the suggestion. 2. Because the volume on the active server is missing, the data on the two servers may be inconsistent. So, the passive server will be shown as damaged in Synology High Availability. 3. Follow the steps in the Crashed storage space or SSD cache section of 2.3.1 Repair volumes on the passive server. Crashed storage space or SSD cache Crashed storage spaces or SSD caches are usually caused by drive errors. In this case, the active server data may be unavailable.1 As long as the system is operating normally, the passive server will take over to provide services. However, the passive server cannot take over if it has any other errors on it. Follow the steps below to check or fix any errors on the passive server before the system performs auto-failover. Once the the devices have switched over, refer to the Crashed storage space or SSD cache section of 2.3.1 Repair volumes on the passive server to continue the repair. 1. Check your logs, notifications, or emails for any errors that may have occurred on the passive server. 2. Make sure that the passive server is powered on and its Ethernet cable is connected properly. 3. If the devices are still unable to fail over, refer to Chapter 3: Contact Customer Service to contact Synology Technical Support for further assistance. Notes: 1. If only the read-only cache is missing, the data on the active server will still be available. 2. Online Assemble cannot be used for missing read-only caches. Instead, remove the missing read-only cache and then re-create it. Degraded storage space or SSD cache Volume degradation is usually caused by drive errors. However, the RAID type of the storage pool can sustain the drive failures when volume degradation occurs. The data on the drive is temporarily safe, but we recommend you to repair it as soon as possible to avoid future errors on other drives. 48

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48
Chapter 2: SHA Troubleshooting
2. Install the drive into the correct slot on the active server. If the read/write cache is also lost,
make sure that the drive that the read/write cache is on is also installed correctly.
3. Go back to
Storage Manager
>
Storage
, and click on the storage pool to expand its
information.
4. Click the upper-right icon
and select
Online Assemble
.
2
Re-create the volume
If the volume cannot be repaired using the methods above, you can perform a force failover to
make the passive server take over services.
1. Go to
Synology High Availability
>
Cluster
and click
force failover
in the suggestion.
2. Because the volume on the active server is missing, the data on the two servers may be
inconsistent. So, the passive server will be shown as
damaged
in Synology High Availability.
3. Follow the steps in the
Crashed storage space or SSD cache
section of
2.3.1 Repair
volumes on the passive server
.
Crashed storage space or SSD cache
Crashed storage spaces or SSD caches are usually caused by drive errors. In this case, the
active server data may be unavailable.
1
As long as the system is operating normally, the
passive server will take over to provide services. However, the passive server cannot take over
if it has any other errors on it.
Follow the steps below to check or fix any errors on the passive server before the system
performs auto-failover. Once the the devices have switched over, refer to the
Crashed storage
space or SSD cache
section of
2.3.1 Repair volumes on the passive server
to continue the
repair.
1. Check your logs, notifications, or emails for any errors that may have occurred on the
passive server.
2. Make sure that the passive server is powered on and its Ethernet cable is connected
properly.
3. If the devices are still unable to fail over, refer to
Chapter 3: Contact Customer Service
to
contact Synology Technical Support for further assistance.
Notes:
1. If only the read-only cache is missing, the data on the active server will still be available.
2.
Online Assemble
cannot be used for missing read-only caches. Instead, remove the
missing read-only cache and then re-create it.
Degraded storage space or SSD cache
Volume degradation is usually caused by drive errors. However, the RAID type of the storage
pool can sustain the drive failures when volume degradation occurs. The data on the drive is
temporarily safe, but we recommend you to repair it as soon as possible to avoid future errors
on other drives.