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Re: Slow XFS write

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Hi all,

After some research on my RAID controller, PERC H310 Mini on a Dell 
server, I found a lot performance issue. It does not have WriteBack 
cache or BBU. I do not tested to write directly on the partition because 
I have some backup to do before but I think reinstall the server on a 
software RAID is the best solution here.

Thanks to all

Le 23/08/2018 à 09:07, Stefan K a écrit :
> Hello,
>
> did you really need the hardware controller? I suggest to use Software/MD raid, ob btrfs with raid1 or zfs with raidz1

> Looks suspiciously similar to LSI MegaRAID.
> Is controller firmware current? Is it possible to upgrade it?
> Since you seem to have BBU, have you considered enabling WriteBack mode?
>
> Reco

> Can you rebuild the partition? If so, unmount it then perform the dd 
> directly to the device. (of=/dev/sda2 or whatever) What's the hardware 
> raid vendor? Honestly, the performance of ext4 partition is also 
> horrible, just not as bad as the xfs partition. What's the hardware 
> raid model? Does it have a battery backed cache? (I will guess not, 
> because the test is only 1G and that should fit into most current 
> caches?) If the test directly to the partition shows good performance, 
> then it might be an alignment issue; try recreating the fs with 
> `mkfs.xfs -d su=64k,sw=2 ...`. If the performance is the same to the 
> raw partition (and still much worse than the root partition) then the 
> partition alignment itself might be off--which means recreating the 
> partitions. (fsck and mkfs.xfs normally handle this automatically, but 
> that depends on the raid controller+driver passing the information up, 
> and per your xfsinfo output, that didn't happen.)
>
> Mike Stone 

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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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