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ZFS is a very robust choice for a NAS. Many people, myself included, as well as hundreds of businesses across the globe, have used ZFS at scale for over a decade.
Attack the problem. Check your system logs, htop, zpool status.
When was the last time you ran a zpool scrub? Is there a scrub, or other zfs operation in progress? How many snapshots do you have? How much RAM vs disk space? Are you using ZFS deduplication? Compression?
MergerFS + Snapraid is a really nice way to turn ext4 mounts into a single entry point NAS. OpenMediaVault has some plugins for setting this up. Performance wise it will max out the drive of whichever one you are using and you can use cheap mismatched drives.
How full is your ZFS? ZFS doesn't handle disk filling and fragmentation well.
3mb/s sounds more like there is something else going on.
Yeah, but I don't know how to diagnose it...
You could try to redo the copy and monitor the system in htop, for example. Maybe there's a memory or CPU bottleneck. Maybe one of your drives is failing, maybe you've got a directory with tons of very small files, which causes a lot of overhead.
Yes, file size, drive types, the amount of RAM in the server, in the source and destination of the operation, can all have an effect on Performance. But generally if he’s moving within the same pool, it should be pretty quick.
XFS has "just worked" for me for a very long time now on a variety of servers and desktop systems.
Ext4 does not have snapshots, COW or similar features. I am very happy with BTRFS. It just "works" out of the box.
I use BTRFS on everything too nowadays. The thing that made me switch everything to BTRFS was filesystem compression.
Yes and BTRFS, unlike Ext4, will not go corrupt on the first power outage of slight hardware failure.
Wut? Ext4 is quite reliable.
This will also happen to Ext4. You just wouldn't know it.
I'm confused with your answer. BTRFS is good and reliable. Ext4 gets fucked at the slightest issue.