Hi,

 

I am getting extremely slow network performance from my server with write speeds of 10MB/Sec or less. Read speeds are in the 40MB/Sec range.  I am connected to Gigabit ethernet.  Looking at the network graph in Dynamix I see ethernet speeds of >700Mb/sec when reading but only a maximum of about 80Mb/sec when writing, and they seem to be "flat-topped" at that amount. I know the array should be slower when writing but I want thinking it would be that slow. 

 

Thanks for any suggestions.

 

NM

Attach a syslog. Note the time of your transfers. What is the client specifications?

I have attached the syslog.  The PC it's running on is a Dell T3500 workstation.  I have 5 x Seagate Barracuda ST3000DM001 drives, 7200RPM. I am using this unRAID in my office.

 

I have another unRAID at home - with 3 different size and different manufacturer disks (all 5400 RPM) and can easily get over 40MB/sec on writes through Gigabit ethernet.

 

Thanks

NM

syslog.zip

Update to 5.0.5. No point in debugging an old release.

Speeds in the 10MB range with Gb equipment often mean you have a continuity issue with a wire pair or a connector.  Try replacing ALL of the Ethernet cables involved in the transfers and see if that resolves it.

 

Update to 5.0.5. No point in debugging an old release.

 

I am running 5.0.5.

One thing I wasn't sure of was this BIOS setting on the PC.  Which should I choose:

 

Drives:  SATA Operation

 

  RAID Autodetect / AHCI

  RAID Autodetect / ATA

  RAID On

 

Thanks

AHCI

 

Sent from a mobile device, sorry for any typos.

 

 

That's what I chose AHCI

Swapped out network cable and plugged it into a different port on the switch too - getting < 8 MB/sec today 

Copying from a different source has sustained write of 30MB/sec for large files - so I guess it was a network issue unrelated to unRAID.

Are you sure you checked EVERY cable and connection on the system that's got the slow writes?

 

Any cable between the PC and a UPS; cables to the switch; and even the switch ports.  Your UnRAID server is clearly working fine -- 30MB/s is about the right range for writes to the protected array.    It's almost certain that you've either got a bad NIC, or a cable or connector with a discontinuity.