Synology SA3200D Synology High Availability SHA User Guide for DSM 7.0 - Page 19

undetectable, Share1, Split-brain error

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Chapter 3: Set Up and Configure an SHA Cluster 4. Sign in to NAS-B using the high-availability cluster IP address. The high-availability cluster status will show that NAS-B is the active server and NAS-A is undetectable. In this case, NAS-A and NAS-B are both acting as the active server.1 5. Make some changes to the data in the shared folder Share1 of NAS-B to create differences (data inconsistencies) between the files on each server. 6. After about ten minutes, reconnect NAS-A's Heartbeat interface and the primary cluster interface network cable. Once NAS-A and NAS-B are reconnected, the system will start to consolidate the data. When the system discovers that the data is inconsistent (split-brain error), the High Availability cluster will enter Safe Mode. 7. After waiting some time, sign in to DSM (NAS-A) via one of the server's IP address. You will see that the high-availability cluster status displays Split-brain error. Notes: 1. If you do not see the split-brain error status, it means that the simulation was unsuccessful. Plug your devices back in and follow the steps from the beginning of this section to try again. 17

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17
Chapter 3: Set Up and Configure an SHA Cluster
4. Sign in to NAS-B using the high-availability cluster IP address. The high-availability cluster
status will show that NAS-B is the active server and NAS-A is
undetectable
. In this case,
NAS-A and NAS-B are both acting as the active server.
1
5. Make some changes to the data in the shared folder
Share1
of NAS-B to create differences
(data inconsistencies) between the files on each server.
6. After about ten minutes, reconnect NAS-A’s Heartbeat interface and the primary cluster
interface network cable. Once NAS-A and NAS-B are reconnected, the system will start to
consolidate the data. When the system discovers that the data is inconsistent (split-brain
error), the High Availability cluster will enter Safe Mode.
7. After waiting some time, sign in to DSM (NAS-A) via one of the server’s IP address. You will
see that the high-availability cluster status displays
Split-brain error
.
Notes:
1. If you do not see the split-brain error status, it means that the simulation was
unsuccessful. Plug your devices back in and follow the steps from the beginning of this
section to try again.