<div dir="auto">You are likely to find that stress testing will kill most SD cards within a day or two. They simply aren't designed for small write workload. They are designed for large streaming writes (and they are fine for reads, obviously).<div dir="auto"><br></div><div dir="auto">"Endurance" models fare much better, but you will still kill then quickly with continuous small random writes.</div><div dir="auto"><br></div><div dir="auto">If you want reasonable performance and longevity out of them, use nilfs2 or ZFS. Otherwise they are only suitable for workloads that are not random-write intensive in the way that traditional UNIX file system workloads are.</div></div><br><div class="gmail_quote"><div dir="ltr">On Thu, 13 Dec 2018, 16:54 Stephan Guilloux <<a href="mailto:stephan.guilloux@crisalid.com">stephan.guilloux@crisalid.com</a> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
  
    
  
  <div text="#000000" bgcolor="#FFFFFF">
    Well...<br>
    Stress test still running on reputable brand with no PB, after 6 or
    7h.<br>
    <br>
    During this stressing session, we found a few broken SD, from
    another reputable brand. <br>
    Not all cards, though, but enough to put some confusion... ;-)<br>
    Something else added to the confusion, was an article on a Linux
    block layer issue...<br>
    <br>
    OK.<br>
    Now, at least, we have a "stressing" tool and a stack of RPI in case
    of doubt on SD :-)<br>
    <br>
    By the way, is there any well known bench mark tool for SD, on
    CentOS or OpenSource ?<br>
    <br>
    <br>
    <br>
    <div class="m_-117858969839705840moz-cite-prefix">Le 13/12/2018 à 16:19, Fred Gleason a
      écrit :<br>
    </div>
    <blockquote type="cite">
      
      On Dec 13, 2018, at 06:06, Manuel Wolfshant <<a href="mailto:wolfy@nobugconsulting.ro" target="_blank" rel="noreferrer">wolfy@nobugconsulting.ro</a>> wrote:
      <div><br>
        <div>
          <blockquote type="cite">
            <div><span style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;float:none;display:inline!important">did
                this happen with multiple SD-cards ? if not, I strongly
                suspect that the issue is that particular card , not the
                OS. it rhymes extremely well with either a faulty card
                or a card whose firmware was doctored to report a larger
                size than the one it really has</span><br style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">
            </div>
          </blockquote>
          <br>
        </div>
        <div>++</div>
        <div><br>
        </div>
        <div>Been there, done that! After seeing a large number of
          ‘infant mortalities’ with RaspPi 3+ setups using cheapie ‘no
          brand’ microSD cards, we made the switch to using only ‘name
          brand’ cards from reputable manufacturers. Problem solved.</div>
        <div><br>
        </div>
        <div><br>
        </div>
        Cheers!</div>
      <div><br>
      </div>
      <div><br>
      </div>
      <div>
        <div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo"><span style="font-variant-ligatures:no-common-ligatures">|----------------------------------------------------------------------|</span></div>
        <div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo"><span style="font-variant-ligatures:no-common-ligatures">|
            Frederick F. Gleason, Jr. |              Chief Developer    
                    |</span></div>
        <div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo"><span style="font-variant-ligatures:no-common-ligatures">|
                                      |              Paravel Systems    
                    |</span></div>
        <div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo"><span style="font-variant-ligatures:no-common-ligatures">|----------------------------------------------------------------------|</span></div>
        <div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo"><span style="font-variant-ligatures:no-common-ligatures">| 
                    A room without books is like a body without a soul.
                    |</span></div>
        <div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo"><span style="font-variant-ligatures:no-common-ligatures">|
                                                    -- Cicero           
                    |</span></div>
        <div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo"><span style="font-variant-ligatures:no-common-ligatures">|----------------------------------------------------------------------|</span></div>
      </div>
      <br>
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    </blockquote>
    <br>
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