So I asked earlier about backing up the media files in my home lab, and thanks for the many who replied, I settled on sanoid / syncoid and has been running them for some time.
My setup:
pool1/data contains my media files pool2/data backup
I use sanoid to make periodic snapshots of pool1/data, and then runs
syncoid pool1/data pool2/data
to replicate the snapshots to pool2.
This works fine, except I noticed that a lot of data is being copied even though pool1 did not change much. And now I just noticed pool2 ran out of space some time ago, while pool1 is currently only half full (pool1 & pool2 are the same size).
Is it because snapshots are somehow deduplicated when created on pool1, but is fully transferred to pool2 when syncoid runs? Is there something I can do to lower the usage on the backup pool? Thanks.
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Not enough info, but it sounds almost like you’re creating the snapshots locally and sending those over instead of snapshotting to the destination directly.
Sanoid and syncoid are Jim Salter’s creation. Check out his blog at mercenarysysadmin.com for some examples of sanoid and syncoid. Klara systems also has a number of deep dives into those utilities.