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Jeff123

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  1. On 2/7/2019 at 4:11 PM, Niklas said:

     

     

    Hello,

     

    I'm pulling my hair here. Using Unraid 6.7 RC2 but had this problem on 6.6.6 too (well, I think so.. bad memory). 

     

    When transferring big files to Unraid (array) from Windows via SMB, the transfer grinds to a halt after what seems to be a set size. The speed is 110MB/s (how is this possible? Does it cache in ram or something before writing to the array?) until it dips down to like 2 MB/s or often 0MB/s. It stays like that for a couple of minutes and the network share goes unresponsive (Explorer not responding), same thing with the Unraid web ui (it gets very slow or time out). Suddenly it starts transferring again but grinds to a halt after a while again. When this happens I can see writes going on to one of the data disks and to the parity drive but the speed is like 10-20 MB/s. When it is done, the transfer picks up again. Not using cache for that share. If I cancel the transfer, I can see Unraid still writing to parity and data a while after and until it is done, the share will be unresponsive until done.

     

    Sorry, much information but I don't know what to do next. This only happens during write operations. Reading will transfer at a steady 110MB/s.
    Specs in signature.
    This is recorded while Unraid in safe mode, writing to parity and data seems really slow?

     

     

     

    Hello, 

     

    Did you manage to solve this issue? I am currently seeing the same problem while trying to move around 9TB onto a newly installed unraid server. I am considering moving from freenas to unraid so installed unraid 6.8 onto my test HP N40L server containing 2x6TB WD reds ( 1 used for parity) and 2x3TB WD greens with no cache drive. The data has been copying for over two days but still far from done. I also see the burst of fast copy (~100MB/s) copying roughly 2GB - 2.5GB before stalling for roughly a minute. I also see the same slow read/write from the drives as shown in your video during this minute of network inactivity which makes me think that it is copying a small portion to RAM before calculating parity and writing to disk. Is this the case?

     

    This same machine and drives did not show this behaviour in freenas which also contained the same discs in an array with one used for parity. I have enabled turbo write mode as some suggest but this did not solve this issue. Any suggestions?

     

    Thanks for any help or advice.

     

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