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A Step-by-Step Guide toSynchronous Volume
Replication(Block Based) over a LAN
with Open-EDSS V6
Software Version: DSS ver. 6.00 up50
Presentation updated: December 2010
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Synchronous Volume Replication over a LAN
Volume Replication is a process of coping a source logical volume to a destination system. Volume replication provides maximal availability in case one of the systems or units fails.
ReplicationMode
Source/Destination Data Transfer Volume Type
Sync
hronous
Async
hronous
w/System
LAN
WAN
File
base
d
Bloc
kbase
d
NAS
iSCSI
FC
File-I
O
Bloc
k-I
O
Synchronous Volume Replication over a LAN
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REPLICATION BETWEEN TWO SYSTEMS WITHIN ONE LAN Recommended Resources
Key Hardware (two systems) x86 compatible,
RAID Controller,
HDDs,
Network Interface Cards.
Software Open-E DSS V6, 2 units.
Benefits Data Redundancy over a LAN,
Enables continuous data access.
Disadvantages High cost of solution,
Natural disasters can destroy local systems.
Synchronous Volume Replication over a LAN
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VolumeReplication
Write Data
Read Data
RAID System 1Primary RAID System 2
Secondary
Data is written and read to System 1
Data is continiously replicated to System 2
Synchronous Volume Replication over a LAN
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XRAID System 1Primary RAID System 2
Secondary
In case of raid array error or disk drive error on the System 1, the serverwill send an e-mail notification to the administrator,
In the case of a failure of system 1, users will be notified,
Administrator then switches users to the System 2.
Synchronous Volume Replication over a LAN
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XWrite Data
Read Data
RAID System 1Primary RAID System 2
SecondaryX
After switching, replicated volume is available on System 2
Synchronous Volume Replication over a LAN
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1. Configure Hardware
2. Configure the destination node
3. Configure the source node
4. Configure the replication task
5. Check the status of volume replication
TO SET UP VOLUME REPLICATION, PERFORM THE FOLLOWING STEPS:
Setting up Synchronous Volume Replication over a LAN
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Setting up Synchronous Volume Replication over a LAN
Data Server (DSS2)
Destination nodeIP Address: 192.168.0.221
Data Server (DSS1)
Source nodeIP Address: 192.168.0.220
Volume Groups (vg00)Volume Groups (vg00)
RAID System 1Primary
RAID System 2Secondary
Volume Replication
iSCSI volume (lv0000)
iSCSI targets
iSCSI volume (lv0000)
iSCSI targets
Hardware RequirementsTo run the Volume replication of Open-E DSS V6, a minimum of
two systems are required. Both servers are working in the Local
Area Network. An example configuration is shown below: 1. Configure Hardware
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Under the CONFIGURATIONmenu, select volumemanager.
Volume Groups (vg00)
Setting up Synchronous Volume Replication over a LAN
Data Server (DSS2)
Destination nodeIP Address: 192.168.0.221
Add the selected physical units
(Unit S000) to create a newvolume group (in this case,vg00) and click apply button.
2. Configure the Destination Node
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2. Configure the Destination Node
Select the appropriate volume
group (vg00) from the list onthe left and create a new iSCSIvolume of the required size.This logical volume will be the
destination of the replicationprocess.
After assigning an appropriate
amount of space for the iSCSI
volume, click the apply button
iSCSI volume (lv0000)
Setting up Synchronous Volume Replication over a LAN
Data Server (DSS2)
Destination nodeIP Address: 192.168.0.221
Next check the box to Usevolume replication
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Setting up Synchronous Volume Replication over a LAN
Data Server (DSS2)
Destination nodeIP Address: 192.168.0.221
The destination iSCSI Volume
Block I/O is now configured.
iSCSI volume (lv0000)
2. Configure the Destination Node
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Next, underMirror Server IPfunction, enter the IP address of
the Primary node (in our
example, this would be
192.168.1.220) and click the
apply button.
Now, select the Vol. replicationand check the box under
Destination and click the applybutton.
Volume Replication
Setting up Synchronous Volume Replication over a LAN
Data Server (DSS2)
Destination nodeIP Address: 192.168.0.221
2. Configure the Destination Node
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Choose CONFIGURATION , iSCSI target manager and
Targets from the menu
iSCSI targets
In the Create new targetfunction enter a name for the
new target (as desired) in the
Name field and click apply toconfirm.
Setting up Synchronous Volume Replication over a LAN
Data Server (DSS2)
Destination nodeIP Address: 192.168.0.221
2. Configure the Destination Node
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The configuration of the
Destination Node (storage server)
is now complete.
iSCSI targets
Select target0 within theTargets field.
To assign a volume to the
target, click the button
located underAction
Setting up Synchronous Volume Replication over a LAN
Data Server (DSS2)
Destination nodeIP Address: 192.168.0.221
2. Configure the Destination Node
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Under the CONFIGURATIONmenu, select volumemanager..
Volume Groups (vg00)
Add the selected physical units
(Unit MD0) to create a newvolume group (in this case,vg00) and click apply button.
Setting up Synchronous Volume Replication over a LAN
Data Server (DSS1)
Source nodeIP Address: 192.168.0.220
3. Configure the Source Node
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NOTE:The source and destination volumes
must be of identical size. Remember to
enable Volume Replication.
iSCSI volume (lv0000)
Select the appropriate volume
group (vg00) from the list onthe left and create a new iSCSIvolume of the required size.This logical volume will be the
destination of the replication
process.
Next check the box to Usevolume replication.After
assigning an appropriateamount of space for the iSCSI
volume, click the apply button.
Setting up Synchronous Volume Replication over a LAN
Data Server (DSS1)
Source nodeIP Address: 192.168.0.220
3. Configure the Source Node
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The destination iSCSI Volume
Block I/O is now configured.
iSCSI volume (lv0000)
Setting up Synchronous Volume Replication over a LAN
Data Server (DSS1)
Source nodeIP Address: 192.168.0.220
3. Configure the Source Node
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iSCSI targets
In the Create new targetfunction enter a name for the
new target (as desired) in the
Name field and click apply toconfirm.
Setting up Synchronous Volume Replication over a LAN
Data Server (DSS1)
Source nodeIP Address: 192.168.0.220
Under the CONFIGURATIONtab, select iSCSI target
manager and Targets
3. Configure the Source Node
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iSCSI targets
Select target0 within theTargets field.
To assign a volume to the
target, click the button
located underAction
Setting up Synchronous Volume Replication over a LAN
Data Server (DSS1)
Source nodeIP Address: 192.168.0.220
3. Configure the Source Node
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Next, underMirror Server IPfunction, enter the IP address of
the destination node. In our
example, this would be
192.168.0.240 click the applybutton
Now, select the Vol.replication and check box
underSource and click theapply button
Volume Replication
Setting up Synchronous Volume Replication over a LAN
Data Server (DSS1)
Source nodeIP Address: 192.168.0.220
3. Configure the Source Node
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In the Destination volume fieldselect the appropriate volume
(in this example, lv0000) andclick apply to confirm.
The configuration of the Source
Node (storage server) is now
complete.
Setting up Synchronous Volume Replication over a LAN
Data Server (DSS1)
Source nodeIP Address: 192.168.0.220
Enter the task name in field
Task name next,click on the button.
4. Configure replication task
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After the DSS V6 console has
reloaded, you can start, stop or
delete the task within the
Replication task managerfunction.
Setting up Synchronous Volume Replication over a LAN
Data Server (DSS1)
Source nodeIP Address: 192.168.0.220
4. Configure replication task
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NOTE:Once the replication process hasstarted, the replication direction cannotbe changed.
Also, you can start, stop or
delete the task within the
Replication Task Managerfunction by clickling on the
name replication (in this case,
ReplicationTask)
Setting up Synchronous Volume Replication over a LAN
Data Server (DSS1)
Source nodeIP Address: 192.168.0.220
4. Configure replication task
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5. Check the status of volume replication
Setting up Synchronous Volume Replication over a LAN
Data Server (DSS1)
Source nodeIP Address: 192.168.0.220
Under the STATUS menu,select tasks, next selectVolume Replication .
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Click on button with task
name (in this case
ReplicationTask) to displaydetailed information on the
current replication task.
Setting up Synchronous Volume Replication over a LAN
Data Server (DSS1)
Source nodeIP Address: 192.168.0.220
5. Check the status of volume replication
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The replication task provides
information about the consistencyof the data on destination node. In
this case the replication proces for
the destination mode is ended.
Volume Replication, between
source and destination nodes,
is now complete
Setting up Synchronous Volume Replication over a LAN
Data Server (DSS1)
Source nodeIP Address: 192.168.0.220
5. Check the status of volume replication
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