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Re: Slow XFS write

From Reco <recoverym4n@gmail.com>
Newsgroups linux.debian.user
Subject Re: Slow XFS write
Date 2018-08-22 19:40 +0200
Message-ID <wpFgR-1SL-7@gated-at.bofh.it> (permalink)
References <wpy5I-606-7@gated-at.bofh.it> <wpC9j-6z-3@gated-at.bofh.it>
Organization linux.* mail to news gateway

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	Hi.

On Wed, Aug 22, 2018 at 04:15:30PM +0200, Martin LEUSCH wrote:
> To complete the description there is infos about the XFS partition:
> 
> meta-data=/dev/sda4              isize=256    agcount=11, agsize=268435455 blks
>          =                       sectsz=512   attr=2, projid32bit=1
>          =                       crc=0        finobt=0
> data     =                       bsize=4096   blocks=2920268544, imaxpct=5
>          =                       sunit=0      swidth=0 blks
> naming   =version 2              bsize=4096   ascii-ci=0 ftype=0
> log      =internal               bsize=4096   blocks=521728, version=2
>          =                       sectsz=512   sunit=0 blks, lazy-count=1
> realtime =none                   extsz=4096   blocks=0, rtextents=0

Nothing unusual IMO. Certainly nothing that could explain such a
slowdown.

Can you provide a result of 'perf top'? Just to be sure it's xfs that's
to be blamed.

> And infos about the RAID5 volume:

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

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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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