I have a 2.5Gbps connection from Mac to Unraid - Iperf shows full saturation of network bandwith on writing to Cache pool using BlackMagic Disk speed test but I cant get above 19MB on the read speeds???? What am I doing wrong? Here is my SMB Extra config:

Edited September 17, 2025Sep 17 by UnraidVirgin

10 hours ago, UnraidVirgin said:

Iperf shows full saturation of network bandwith

On both directions?

4 minutes ago, JorgeB said:

On both directions?

No just on the write

when I do speedtest between mac and mac mini on the network I have full saturation writing and reading however when I try it with the Unraid server I only get 15-19 MB on the read. Cache pool has now been upgraded to ZFS but no difference in the read speeds.....I can not figure out why???

Edited September 18, 2025Sep 18 by UnraidVirgin

Here is my SMB config. I use a Mac Studio.

I connected it at 2.5 Gbit, but it also worked flawlessly at 10 Gbit and had the full expected bandwidth.

Time machine works also well.

interfaces = 10.80.51.254;capability=RSS,speed=2500000000

veto files = /._*/.DS_Store/

aio read size = 1

aio write size = 1

strict locking = No

use sendfile = No

server multi channel support = Yes

readdir_attr:aapl_rsize = no

readdir_attr:aapl_finder_info = no

readdir_attr:aapl_max_access = no

fruit:posix_rename = yes

fruit:metadata = stream

vfs objects = catia fruit streams_xattr

-faxxe

48 minutes ago, UnraidVirgin said:

No just on the write

I meant iperf, post the iperf results in both directions; use -R to reverse.

2 hours ago, JorgeB said:

I meant iperf, post the iperf results in both directions; use -R to reverse.

here you go

Uploading Attachment...

2 hours ago, faxxe71 said:

Here is my SMB config. I use a Mac Studio.

I connected it at 2.5 Gbit, but it also worked flawlessly at 10 Gbit and had the full expected bandwidth.

Time machine works also well.

interfaces = 10.80.51.254;capability=RSS,speed=2500000000

veto files = /._*/.DS_Store/

aio read size = 1

aio write size = 1

strict locking = No

use sendfile = No

server multi channel support = Yes

readdir_attr:aapl_rsize = no

readdir_attr:aapl_finder_info = no

readdir_attr:aapl_max_access = no

fruit:posix_rename = yes

fruit:metadata = stream

vfs objects = catia fruit streams_xattr

-faxxe

is the interface ip address the same as the servers IP address?

The iperf results show that you have a network issue limiting speed in one direction (although not sure why) so this is what needs fixing .

what on earth could it be? Its going straight to a switch on a 10G port and out on a 10g port to Unraid server

Like mentioned, iperf confirms it's a LAN problem, typically the NIC (or its driver/settings), cable, switch, transceiver (when applicable), or client PC.

Just now, itimpi said:

The iperf results show that you have a network issue limiting speed in one direction (although not sure why) so this is what needs fixing .

Yep turned out to be a transceiver module now running 10g - thank you