USB DIsk extremly slow

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mud_diver
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USB DIsk extremly slow

Unread post by mud_diver » Thu Jul 12, 2018 8:45 pm

Hi,

i tried to USBCopy about 900 GB to a newly attached USB 3 external device, but after 8 hours still copying i aborted the job.

The Nas is a DS214+ with 2x4TB WD red, the external drive is a WD Elements Desktop with 6TB , formated as ext4 with DSM. DSM Version is 6.2-23793 which seems to be the latest.

After that i tried to do same copy with the disk connected to my Computer with Debian stretch and the Copy performance was as expected very good so i am sure, the external disk as well as the cable is ok.

Any clues what is going wrong ? My plan was to use the external 6tb as a weekly backup, but with this extremely slow response this is unusable.

Thank you for any help
DS214+ - 2 x WD Blue 6TB / DS414 - 2 x 4TB WD red 1x 8 TB WD red / USV Cyberpower 900

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eaz
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Re: USB DIsk extremly slow

Unread post by eaz » Thu Jul 12, 2018 8:58 pm

Usb2 will copy at max speed about 200gb/hour, that is based on large files. The speed in practice may be much lower.because of realiy is a lot of small files.
You might try hyper backup and do the incremental backup. This will take time the first backup, nut afterwards several minutes at max.
Please share if a reply was useful or how the issue was solved, it helps other DS users.

DS415+ (4TB HGST+ 4TB Seagate raid1 + 2*480GB SSD raid1), DS212+ (2*WD red 2TB), previous DS411J, DS106

mud_diver
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Re: USB DIsk extremly slow

Unread post by mud_diver » Fri Jul 13, 2018 7:03 am

eaz wrote:
Thu Jul 12, 2018 8:58 pm
Usb2 will copy at max speed about 200gb/hour, that is based on large files. The speed in practice may be much lower.because of realiy is a lot of small files.
You might try hyper backup and do the incremental backup. This will take time the first backup, nut afterwards several minutes at max.
You are right with usb2, but the connected disk is capable of usb 3 and connected to a usb3 port on the diskstation. As max speed within usb3 is 300 mb/s i await 1/3 of 100 mb/s, which should end in more than 3 GB per hour.

After connecting the external disk to my debian desktop the disk easy reach the expected speed. So on the DS is linux runnning and i can't understand this discrepancy.
DS214+ - 2 x WD Blue 6TB / DS414 - 2 x 4TB WD red 1x 8 TB WD red / USV Cyberpower 900

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eaz
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Re: USB DIsk extremly slow

Unread post by eaz » Fri Jul 13, 2018 4:01 pm

Best to check if the connection speed is the bottleneck to check a big file like a movie and time it.
It is pretty normal that copying many small files takes much more time than big files. What does the performance monitor give you als a limiting resource?
Please share if a reply was useful or how the issue was solved, it helps other DS users.

DS415+ (4TB HGST+ 4TB Seagate raid1 + 2*480GB SSD raid1), DS212+ (2*WD red 2TB), previous DS411J, DS106

mud_diver
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Re: USB DIsk extremly slow

Unread post by mud_diver » Fri Jul 13, 2018 9:17 pm

eaz wrote:
Fri Jul 13, 2018 4:01 pm
Best to check if the connection speed is the bottleneck to check a big file like a movie and time it.
It is pretty normal that copying many small files takes much more time than big files. What does the performance monitor give you als a limiting resource?
Well, the performance monitor does not show any peaks. I agree that there is a difference in copying small or large files.

My problem is that the same external device connected to a linux desktop via usb3 is about 4 to 6 times faster than connected with the same cable via usb3 to the Diskstation. In the meantime i have done a lot research and found out, that there are a lot of Synology users experiencing the same problem. As far as i was reading it seems that there is a problem with the usb3 ports on the diskstation.

I will open a support ticket with synology to see if they are aware of problem.
DS214+ - 2 x WD Blue 6TB / DS414 - 2 x 4TB WD red 1x 8 TB WD red / USV Cyberpower 900

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