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Did some testing on NAS functionality on my 7590 with old external 2,5″ 500GB HDD on USB port and formated with ext4 as NTFS will serve only about half speeds. Large HDD not tested but reported to work too, partitions limited to 4TB (I personally wont use that).
Working quite reliable for me with good enough speeds for our needs (music and video streaming and little backup or file sharing).
I tested large files with 67GB data as well as many 171000 files filling disk and all ok.
Using SMB for file transfer, FTP working but much slower for small files (thought it should be faster). PC connected over LAN, Wifi (link speed 800Mb/s) will slower read and write ~20%.
USB3.0 isn’t much faster than 2.0 with my HDD, maybe SSD could get little more, so in future I will use USB2.0 (green mode) only to keep my 2.4GHz Wifi perfect for backhaul to remote mesh-node.
Here my results:
large file read/write: 55/22 MB/s
small files (1kB) read and write same: 1850 files per minute or 31/s
file mix 10GB in 10000 files read/write completed in: 10/15 min thats about 17/12 MB/s
Retested with smaller files read/write in USB2.0 – USB3.0 mode on HDD:
single 1GB file: 27/52s – 21/50s
1000x 1kB files: 44/38s – 43/37s
Mix 1GB file and 1000x 1k files: 69/88s – 64/85s
Result did prove with mix-test as it is about summarized times of the 2 single test.
USB3.0 will be noticeably faster only for reading large files.
Would be interesting to see how it could be improved using a SSD.