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Groups > linux.debian.user > #199231

Re: Slow XFS write

From Martin LEUSCH <sce.tech@imereos.fr>
Newsgroups linux.debian.user
Subject Re: Slow XFS write
Date 2018-08-22 14:30 +0200
Message-ID <wpAqR-7up-9@gated-at.bofh.it> (permalink)
References <wpy5I-606-7@gated-at.bofh.it> <wpzl8-6TX-5@gated-at.bofh.it>
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Le 22/08/2018 à 13:15, Michael Stone a écrit :
> On Wed, Aug 22, 2018 at 11:41:08AM +0200, Martin LEUSCH wrote:
>> I have a NFS server with a hardware RAID5 on 3 HDD of 6 TB. I have a 
>> system partition with ext4 and a data partition with XFS.
>>
>> I get only 10 MB/s in write speed on the XFS data partition and 80 
>> MB/s on the system partition.
>
> how are you testing this? 
I tested write speed with dd command like "dd if=/dev/zero 
of=/var/srv/nfs/testfile bs=1G count=1 oflag=direct".
The 10 MB/s for the data partition also correspond to the behavior I get 
in real situation, when I copy a big file on NFS, 12GB are copied 
quickly then hang for 15 or 20 minutes. When I copy big file with scp, 
It copy quickly the at the beginning then decrease to 10 MB/s till the end.

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Thread

Slow XFS write Martin LEUSCH <sce.tech@imereos.fr> - 2018-08-22 12:00 +0200
  Re: Slow XFS write Michael Stone <mstone@debian.org> - 2018-08-22 13:20 +0200
    Re: Slow XFS write Martin LEUSCH <sce.tech@imereos.fr> - 2018-08-22 14:30 +0200
      Re: Slow XFS write Michael Stone <mstone@debian.org> - 2018-08-22 15:20 +0200
        Re: Slow XFS write Martin LEUSCH <sce.tech@imereos.fr> - 2018-08-22 16:10 +0200
          Re: Slow XFS write Michael Stone <mstone@debian.org> - 2018-08-22 18:00 +0200
            Re: Slow XFS write Michael Stone <mstone@debian.org> - 2018-08-22 18:00 +0200
  Re: Slow XFS write Martin LEUSCH <sce.tech@imereos.fr> - 2018-08-22 16:20 +0200
    Re: Slow XFS write Reco <recoverym4n@gmail.com> - 2018-08-22 19:40 +0200
  Re: Slow XFS write Stefan K <shadow_7@gmx.net> - 2018-08-23 09:10 +0200
    Re: Slow XFS write Martin LEUSCH <sce.tech@imereos.fr> - 2018-08-23 11:20 +0200

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