Hi,
the I/O performance of my RPI5 with SATA HAT is really slow. When I copy files via samba on it, I do not get more than around 5MB/s.
Some Details of my Setup:
RPI5 16GB RAM
12V 10A Power Supply
5x Crucial BX500 (2TB) SSDs
Using ZFS with RAIDZ1
Ubuntu Server 25.04
Boot from USB SSD
When I copy a large file (+2GB) to the Pi, I can see it copies with around 80-90Mb/s until the Cache is filled up. Than the performance drops to 4-5 MB/s. On the CLI I can see with zpool iostat -v 1 the write speed gets never over 5MB/s.
Atop shows a really high IO latency for the disks (around 200ms).
Could the usage of the eSATA port in addition to the 4 SATA ports cause this problem?