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[Xen-API] what is tapdisk-diff and tapdisk-stream

Hello List,

I would like to know details of tapdisk-diff and tapdisk-stream
My aim is to find differences in two vhds and if possible sync them for redundancy via a difference-copy program

The idea is
- find the journel difference of src and dest VHD
- copy journel and modified blocks from src VHD to dest VHD for backup.

in my case both are nfs vhds.

Could anyone please provide me more info on above two programs ?

- Rishi
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