Very Slow disk to disk transfer

[subversive-token7076]

Hi,

 

I'm a complete unraid noob here and I have recently moved to unraid for my plex server. I'm in the initial stages of moving my data over. I have connected my existing hdds - ironwolf 8tb x 4 using unassigned devices plugin. I'm copying movies over to the array - no cache, no parity,  reconstruct write. The speeds start at 160 MB per second and then dwindle to about 14 or 15 MBps. What am I doing wrong here? I can't seem to find an answer to my situation after looking through the forums.

 

Thanks

[MAM59]

do you use zfs as the filesystems for your array drives?

if "yes" consider this speed to be normal and get used to it.

 

 

[JorgeB]

Could also be SMR disks, please post the diagnostics.

[subversive-token7076]

Hi, Thank you for the replies. I am on xfs. I have attached the diagnostics. Any help is much appreciated

masterserver-diagnostics-20230901-1749.zip

[JorgeB]

Disks are not SMR, but there's something reading and writing to disks 1 and 3, copy should be writes only, do you know what's reading, especially from disk3?

[subversive-token7076]

I can't think of anything except maybe plex media server? How can I diagnose what is accessing the disks?

[JorgeB]

Try stopping docker and VM services.