Low ZFS read performance Disk->Tape

hi,

I need some Input for troubleshooting a performance Issue I have on a Proxmox Backup Server I run.

Basically it's an off-site System that syncs with a production PBS. The Specs as follows:

- Supermicro Board + Chasssis
- Dual E-2680v4 Xeon (2x 14c)
- 128GB RAM
- 2x 480gb Seagate Nytro SSD (boot)
- 12x 20TB Seagate Exos / SAS
- 3x 2TB Samsung PM9A3
- Quantum Superloader 3 / LTO9

Now, the Datastore is configured as ZFS RAIDZ2, and has a ZFS special device in form of a 3-way mirrored...

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