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Application Notes
November 2015
How to Remote replicate iSCSI LUN and
Shared Folder using Snapsync on QNAP
Enterprise Storage
History (Document history is QNAP internal, please remove it when converting formal pdf)
Date
Version
Author
Description
Nov 18, 2015
1.0.0
Ason Hu
Initial Draft
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Notices
This user manual provides detailed instructions of using the QNAP Enterprise Storage NAS.
Please read carefully and start to enjoy the powerful functions of the Enterprise Storage NAS.
 The QNAP Enterprise Storage NAS is hereafter referred to as the ES NAS or the NAS.
 This manual provides the description of all the functions of the ES NAS. The product you
purchased may not support certain functions dedicated to specific models.
Legal Notices
All the features, functionality, and other product specifications are subject to change without
prior notice or obligation. Information contained herein is subject to change without notice.
QNAP and the QNAP logo are trademarks of QNAP Systems, Inc. All other brands and product
names referred to are trademarks of their respective holders. Further, the ® or ™ symbols are
not used in the text.
Disclaimer
Information in this document is provided in connection with QNAP® products. No license,
express or implied, by estoppels or otherwise, to any intellectual property rights is granted by
this document. Except as provided in QNAP's terms and conditions of sale for such products,
QNAP Assumes no liability whatsoever, and QNAP disclaims any express or implied warranty,
relating to sale and/or use of QNAP products including liability or warranties relating to fitness
for a particular purpose, merchantability, or infringement of any patent, copyright or other
intellectual property right.
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Table of Contents
Overview .......................................................................................................................................................... 5
What’s Snapsync ........................................................................................................................................................5
Advantage ....................................................................................................................................................................5
System Configuration...............................................................................................................................................6
Setup SnapSync Servers .............................................................................................................................. 7
Add remote host ........................................................................................................................................................7
SnapSync for Shared Folder ...................................................................................................................... 9
Create Shared Folder ...............................................................................................................................................9
Create Shared Folder Replicate Job ................................................................................................................. 11
SnapSync for iSCSI Storage ..................................................................................................................... 16
Create iSCSI Target and LUN ............................................................................................................................... 16
Create iSCSI Storage Replicate Job ................................................................................................................... 19
Disaster Scenario ....................................................................................................................................... 24
Recover from remote site .................................................................................................................................... 24
Break SnapSync ................................................................................................................................................................... 24
Revert Replication direction ........................................................................................................................................... 26
Reprotect from local site ..................................................................................................................................... 28
Getting Ready........................................................................................................................................................................ 28
Revert Replication direction ........................................................................................................................................... 29
Ready to use Storage .......................................................................................................................................................... 29
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Overview
What’s Snapsync
Snapsync allow you to sync local Enterprise Storage iSCSi LUNs and Shared Folder Volumes to
remote Enterprise Storage, which provide efficient backup solution for IT operation usage.
Advantage
Using block level to perform differential backup, the quicker recovery time, requiring only a full
backup and the last differential backup to restore the entire data repository
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System Configuration
Local Site Storage Network Settings
Role
IP
Description
SCA Management
192.168.200.101
Management IP of controller A
SCA Ethernet 1
10.1.1.101
10G Data port 1 in controller A
SCA Ethernet 2
10.1.2.101
10G Data port 2 in controller A
SCB Management
192.168.200.102
Management IP of controller B
SCB Ethernet 1
10.1.1.102
10G Data port 1 in controller B
SCB Ethernet 2
10.1.2.102
10G Data port 2 in controller B
Remote Site Storage Network Settings
Role
IP
Description
SCA Management
192.168.201.101
Management IP of controller A
SCA Ethernet 1
10.1.3.101
10G Data port 1 in controller A
SCA Ethernet 2
10.1.4.101
10G Data port 2 in controller A
SCB Management
192.168.201.102
Management IP of controller B
SCB Ethernet 1
10.1.3.102
10G Data port 1 in controller B
SCb Ethernet 2
10.1.4.102
10G Data port 2 in controller B
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Setup SnapSync Servers
Add remote host
Step 1:
Go to Backup Station
Step 2:
Select Snapsync Server at left panel and then press Create Host button
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Step 3:
Enter remote storage Management IP and admin Password
Step 4:
Now remote server connected
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SnapSync for Shared Folder
Create Shared Folder
Step 1:
Step 2:
Go to Storage Manager
Select Shared Folder at left panel and then press New Shared Folder button
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Step 3:
Configure Storage settings and access privileges, then click on Create button
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Step 4:
Shared Folder replica_demo created
Create Shared Folder Replicate Job
Step 1:
Go to Backup station
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Step 2:
Step 3:
Select SnapSync at left panel and then press Create a Replication Job button
Select paired Remote Host and Source Shared Folder we prepared, then press New button
for creating Destination Shared Folder
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Step 4:
Enter drive name for Destination Shared Folder then click on OK
Step 5:
Check Replication Job settings, then click on OK to finish
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Step 6:
Replication Job created
Step 7:
In the meantime, the destination shared folder has been created at remote site
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Note:
1. In order to prevent changes, destination shared folders are set in Read-Only mode until
SnapSync connection be removed.
2. The destination shared folder’s configuration is separate from the source, so the
Storage settings and access privileges must be reconfigured particularly.
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SnapSync for iSCSI Storage
Create iSCSI Target and LUN
Step 1:
Go to Storage Manager
Step 2:
Select iSCSI Storage at left panel and then press Create button
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Step 3:
Choose iSCSI Target with a mapped LUN and then press Next button
Step 4:
Enter Target Name and then press Next button
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Step 5:
Enter LUN Name and then press Next button to create LUN
Step 6:
Press Finish button to exit configuration wizard
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Step 7:
Target and LUN created, we will create a replication job for the LUN at next step
Create iSCSI Storage Replicate Job
Step 1:
Go to Backup station
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Step 2:
Step 3:
Select SnapSync at left panel and then press Create a Replication Job button
Select paired Remote Host and Source LUN we prepared, then press New button for creating
Destination LUN
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Step 4:
Enter drive name for Destination LUN then click on OK
Step 5:
Check Replication Job settings, then click on OK to finish
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Step 6:
Replication Job created
Step 7:
In the meantime, the destination LUN has been created at remote site
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Note:
1. In order to prevent changes, destination LUNs are set in Read-Only mode and it cannot
be found by iSCSI initiator until SnapSync connection be removed.
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Disaster Scenario
Recover from remote site
At this step, we will shut down and initialize local site storage to simulate disaster recovery.
Break SnapSync
Step 1:
Step 2:
At remote storage, go to SnapSync tab and select the replication job we already paired
Click on Quiesce job button
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Step 3:
After Replication Job state is in quiescent mode, now can click on Delete button to break
Snapsync
Note:
Due to destination shared folder are set in Read-Only mode when SnapSync Replication Job
has been created, you have to break SnapSync to modify the shared folder data.
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Revert Replication direction
Once local site storage come back, we can do a reprotect procedure
Step 1:
Step 2:
Make sure connection to local site is correct
Create reverted replication job for Shared Folder and iSCSI Storage from remote site to local
site
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Step 3:
After replication job has done,
you will see the recovered Shared Folder has been added at
local site
For iSCSI Storage, the recovered LUN can be discovered in Un-Mapped iSCSI List
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Reprotect from local site
Getting Ready
[IMPORTANT] For iSCSI Storage, UNMAP the Destination LUN we have replicated at remote site
to prevent replication failure in next step
For Shared Folder, stop NFS or CIFS connections for safety
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Revert Replication direction
Step 1:
To revert the direction of replication, please follow Shared Folder Replicate Job and iSCSI
Storage Replicate Job to reprotect local site
Step 2:
Bellow pictures are showing how direction of replication changes after reprotect is done
Before (Remote Site to Local Site)
After (Local Site to Remote Site)
Ready to use Storage
Now local site storage date has been fully recovered and can be used again
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