Incremental Replication - I must be missing something

[STREBLO]

I'm trying to replicate from a desktop ZFS pool incrementally. I'm not sure if I'm missing something as I don't see how it's possible to do this without knowing the previous snapshots name. The problem I'm having is that I want to be able to replicate from the desktop incrementalally between the last snapshot I sent, and the current snapshot I just took without having to know in advance what the last snapshot I sent was.

The easiest way I have found to do this is by doing this

e.g. where I'm replicating to the dataset tank/rep

Code:

ssh ${user}@${ip} zfs list -H -o name,creation -p -t snapshot -r tank/rep |  \
    grep "^tank/rep@" | # Look for line starting with tank/rep@
    sort -n -k 2 |  \ # Sort second tab numerically
    tail -1 |  \ # Take last line
    cut -f1 # Take first column

I would think there would be a way to easily query this or tell zfs receive to replicate between the last snapshot and the current snapshot, but I don't see a way to easily do this. What do most people do when they're replicating to find out what the last snapshot sent was?

 

[depasseg]

I think that's the way ZFS works.

I would look into zrep and znapzend to automate the process.

 

[STREBLO]

I think that's the way ZFS works.

I would look into zrep and znapzend to automate the process.

zrep looks promising. Does it work OK Linux -> FreeBSD?

 

[depasseg]

zrep looks promising. Does it work OK Linux -> FreeBSD?

I don't have any experience with replication from Linux. But it appears to be a script, so it is likely.

 

[STREBLO]

I don't have any experience with replication from Linux. But it appears to be a script, so it is likely.

I'm setting up ZnapZend at the moment. Will let you know how it goes.

 

[dpearcefl]

How did you make out?

 

[STREBLO]

I ended up using ZnapZend, works great.