Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.debian.user > #230306

Re: recommendations for supported, affordable hardware raid controller.

Show all headers | View raw

On Sun, Jan 03, 2021 at 11:25:40AM +0200, Andrei POPESCU wrote:
>That would mean all data is written to the disk twice and would make a
>journaling file system twice as slow compared to a non-journaling file
>system; the journal is typically on the same storage.

That's almost never how it's actually implemented these days, exactly 
because of the hideous performance penalty. Barring a non-default option 
like ext3's data=journal what generally happens is that the data is 
written to the disk, then the *metadata* is written to the journal, and 
then the metadata is updated in its final location. The total amount of 
data written to the journal is relatively low. The primary benefit of 
this sort of scheme is avoiding a fsck on unclean shutdown; you may end 
up with old data, new data, or partially written data. Applications 
which need more data integrity guarantees generally implement some sort 
of journalling and/or use atomic filesystem operations. (E.g., write a 
temporary file, flush/sync, rename--that guarantees either the old file or 
the new file will be present, but not a partially written file.)

Back to linux.debian.user | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

recommendations for supported, affordable hardware raid controller. Steven Mainor <steve@degga.net> - 2021-01-01 19:10 +0100
  Re: recommendations for supported, affordable hardware raid  controller. "Alexander V. Makartsev" <avbetev@gmail.com> - 2021-01-01 20:00 +0100
  Re: recommendations for supported, affordable hardware raid  controller. Dan Ritter <dsr@randomstring.org> - 2021-01-01 20:00 +0100
    Re: recommendations for supported, affordable hardware raid controller. Sven Hartge <sven@svenhartge.de> - 2021-01-01 20:40 +0100
  Re: recommendations for supported, affordable hardware raid  controller. David Christensen <dpchrist@holgerdanske.com> - 2021-01-01 21:10 +0100
    Re: recommendations for supported, affordable hardware raid  controller. Steven Mainor <steve@degga.net> - 2021-01-02 09:30 +0100
      Re: recommendations for supported, affordable hardware raid  controller. Steven Mainor <steve@degga.net> - 2021-01-02 09:50 +0100
  Re: recommendations for supported, affordable hardware raid  controller. Michael Stone <mstone@debian.org> - 2021-01-01 21:20 +0100
  Re: recommendations for supported, affordable hardware raid  controller. Steven Mainor <steve@degga.net> - 2021-01-02 09:20 +0100
    Re: recommendations for supported, affordable hardware raid  controller. David Christensen <dpchrist@holgerdanske.com> - 2021-01-02 10:50 +0100
      Re: recommendations for supported, affordable hardware raid  controller. Andrei POPESCU <andreimpopescu@gmail.com> - 2021-01-02 12:30 +0100
        Re: recommendations for supported, affordable hardware raid  controller. Richard Hector <richard@walnut.gen.nz> - 2021-01-02 17:10 +0100
          Re: recommendations for supported, affordable hardware raid controller. Gene Heskett <gheskett@shentel.net> - 2021-01-02 17:50 +0100
        Re: recommendations for supported, affordable hardware raid  controller. David Christensen <dpchrist@holgerdanske.com> - 2021-01-02 22:40 +0100
          Re: recommendations for supported, affordable hardware raid  controller. Andrei POPESCU <andreimpopescu@gmail.com> - 2021-01-03 10:30 +0100
            Re: recommendations for supported, affordable hardware raid  controller. David Christensen <dpchrist@holgerdanske.com> - 2021-01-03 22:50 +0100
              Re: recommendations for supported, affordable hardware raid  controller. Andrei POPESCU <andreimpopescu@gmail.com> - 2021-01-04 08:30 +0100
            Re: recommendations for supported, affordable hardware raid controller. Stefan Monnier <monnier@iro.umontreal.ca> - 2021-01-03 23:20 +0100
            Re: recommendations for supported, affordable hardware raid  controller. Michael Stone <mstone@debian.org> - 2021-01-04 02:00 +0100
              Re: recommendations for supported, affordable hardware raid  controller. Andrei POPESCU <andreimpopescu@gmail.com> - 2021-01-04 08:40 +0100
                Re: recommendations for supported, affordable hardware raid  controller. Michael Stone <mstone@debian.org> - 2021-01-04 14:40 +0100
    Re: recommendations for supported, affordable hardware raid controller. Sven Hartge <sven@svenhartge.de> - 2021-01-02 12:50 +0100
      Re: recommendations for supported, affordable hardware raid controller. Nicholas Geovanis <nickgeovanis@gmail.com> - 2021-01-02 16:30 +0100
        Re: recommendations for supported, affordable hardware raid controller. Sven Hartge <sven@svenhartge.de> - 2021-01-02 17:30 +0100
        Re: recommendations for supported, affordable hardware raid  controller. Alain D D Williams <addw@phcomp.co.uk> - 2021-01-02 18:40 +0100
  Re: recommendations for supported, affordable hardware raid controller. deloptes <deloptes@gmail.com> - 2021-01-02 10:00 +0100

csiph-web