Zyxel Nas 326 (slow copy speed)

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New Around Here
Hello, i have Zyxel 326 Nas, it has two internal 3.5HDD and two external 2.5HDD. I´m only able to transfer at maximum 25MB/s to them. I can download from internet at 60MB/s. I have Xiaomi AX3600 router and i´m transfering to the Nas from WIFI 6 (AX3600 supports WIFI6).

Can´t find the bootleneck :(


Very Senior Member
From the specs page
  • CPU: Marvell Armada 380 1.3 GHz
  • Memory: DDR3 512 MB
  • Two 2.5" or 3.5" SATA II hard disk interface supported up to 32 TB (16 TB x2)
  • One Gigabit Ethernet RJ-45 connector
  • Two USB 3.0 ports
  • One USB 2.0 port
If it is correct that it is using SATA II ( and not a typo), that might explain some of it. Also if you are transferring to/from one of the USB attached disks, that is also likely to be slow.

The numbers they market with will be for sequential read/write which is the fastest. Random read write will be much much slower. Also, the raid type can make a difference, but not usually as much as the difference between sequential and random R/W.

Use Iperf 3 to test the transfer rates directly between a PC and the NAS connected by a single direct ethernet cable to eliminate the router and wired or wireless connections.

What type of transfer are you doing - folder copy ? single large file copy ?
Typical folder copy using SMB protocol can easily be in the 15-30 MB/sec range. A single large file may read or write much faster. Look at the NASPT test results for this NAS on the site or similar ( same processor and drive interface) for comparison. i think you can still download the NASPT test program from Intel, but i haven't looked in years.
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