ZFS SLOG device with no performance effect?

fr33bsd

fr33bsd

Greetings,

I have a sort of backup server for snapshots. This server is only dedicated to receive snapshots. There is no NFS/FTP/.... .

During a transfer of a snapshot using netcat I added a slog NVMe ssd to the backup pool. I was hoping to see even a tiny speed boost, but there was none.

I set “sync=always” on the backup pool to improve write performance, but without success. I know that sync=always is not recommended.

Could it be that write performance does not increase if you use zfs recv to receive a snapshot in a pool?
 
You could verify if during the transfer there are writes towards a log or cache device.
If there are none, there will also be no speed increase using a faster log or cache device.
 
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