How to sync the data between the two iSCSI target server

Hi experts:
I have double HP dl380g8 server, i plan to install the server 2012r2 iSCSI target as storage, i know the iSCSI storage can setup as high ability too, but after some research i doesn't find out how to sync the data between the two iSCSI target server, can
any body help me?
Thanks
There are basically three ways to go:
1) Get compatible software. Microsoft iSCSI target cannot do what you want out-of-box but good news third-party software (there are even free versions with a set of limitations) can do what you want. See:
StarWind Virtual SAN [VSAN]
http://www.starwindsoftware.com/native-san-for-hyper-v-free-edition
DataCore SANxxx
http://datacore.com/products/SANsymphony-V.aspx
SteelEye DataKeeper
http://us.sios.com/what-we-do/windows/
All of them do basically the same: mirror set of LUs between Windows hosts to emulate a high performance and fault tolerant virtual SAN. All of them do this in active-active mode (all nodes handle I/O) and at least StarWind and DataCore have sophisticated
distributed cache implementations (RAM and flash).
2) Get incompatible software (MSFT iSCSI target) and run it in generic Windows cluster. That would require you to have CSV so physical shared storage (FC or SAS, iSCSI obviously has zero sense as you can feed THAT iSCSI target directly to your block storage
consumers). This is doable and is supported by MSFS but has numerous drawbacks. First of all it's SLOW as a) MSFT target does no caching and even does not use file system cache (at all, VHDX it uses as a containers are opened and I/O-ed in a "pass-thru" mode)
b) it's only active-passive (one node will handle I/O @ a time with other one just doing nothing in standby mode) and c) long I/O route (iSCSI initiator -> MSFT iSCSI target -> clustered block back end). For reference see:
Configuring iSCSI Storage for High Availability
http://technet.microsoft.com/en-us/library/gg232621(v=ws.10).aspx
MSFT iSCSI Target Cluster
http://techontip.wordpress.com/2011/05/03/microsoft-iscsi-target-cluster-building-walkthrough/
3) Re-think what you do. Except iSCSI target from MSFT you can use newer technologies like SoFS (obviously faster but requires a set of a dedicated servers) or just a shared VHDX if you have a fault tolerant SAS or FC back end and want to spawn a guest VM
cluster. See:
Scale-Out File Servers
http://technet.microsoft.com/en-us/library/hh831349.aspx
Deploy a Guest Cluster Using a Shared Virtual Hard Disk
http://technet.microsoft.com/en-us/library/dn265980.aspx
With Windows Server 2012 R2 release virtual FC and clustered MSFT target are both really deprecated features as shared VHDX is both faster and easier to setup and use if you have FC or SAS block back end and need to have guest VM cluster.
Hope this helped a bit :)
StarWind VSAN [Virtual SAN] clusters Hyper-V without SAS, Fibre Channel, SMB 3.0 or iSCSI, uses Ethernet to mirror internally mounted SATA disks between hosts.

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