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Re: recommendations for supported, affordable hardware raid controller.

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On 3/01/21 12:24 am, Andrei POPESCU wrote:
> On Sb, 02 ian 21, 01:40:14, David Christensen wrote:
>> 
>> On Linux (including Debian), MD (multiple disk) and LVM (logical volume
>> manager) are the obvious choices for software RAID.  Each have their
>> respective learning curves, but they're not too high.
> 
> An interesting article I stumbled upon:
> http://www.unixsheikh.com/articles/battle-testing-data-integrity-verification-with-zfs-btrfs-and-mdadm-dm-integrity.html

Hmm. It only talks about software raid in the context of RAID-5. They 
acknowledge that RAID-5 is 'frowned upon', but don't go into why, and 
say they think it's great. My take: once you've lost one disk, you have 
the same reliability as a RAID-0 (stripe) set of what's left - much less 
reliable than no RAID at all.

I generally stick with RAID-1, but would consider RAID-10.

> My take:
> 
> If you care about your data you should be using ZFS or btrfs.

Licensing issues and the resulting complications stop me using ZFS, and 
last I heard btrfs wasn't regarded as being as reliable as ext3/4 or xfs 
(I generally use xfs).

I may be out of date, and I've heard bad comments about xfs too ...

> In case of data corruption (system crash, power outage, user error, or
> even just a HDD "hiccup") plain md without the dm-integrity layer won't
> even be able to tell which is the good data and will overwrite your good
> data with bad data. Silently.

I guess I need to investigate that. Any further references? I've had 
crashes and power outages and never noticed any problems, not that that 
means they won't happen (or even that they haven't happened). Does a 
journalling filesystem on top not cover that?

Cheers,
Richard

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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

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