A year ago I set up Ubuntu server with 3 ZFS pools on my server, normally I don’t make copies of very large files but today I was making a copy of a ~30GB directory and I saw in rsync that the transfer doesn’t exceed 3mb/s (cp is also very slow).
What is the best file system that “just works”? I’m thinking of migrating everything to ext4
EDIT: I really like the automatic pool recovery feature in ZFS, has saved me from 1 hard drive failure so far
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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.