Re: Initdb --data-checksums by default

Alex Ignatov <a.ignatov@xxxxxxxxxxxxxx> · Wed, 20 Apr 2016 11:00:56 +0300



    On 20.04.2016 10:47, John R Pierce
      wrote:

    
      On 4/20/2016 12:43 AM, Alex Ignatov
        wrote:

      
      Today

        in Big Data epoch silent data corruption becoming more and more
        issue to afraid of. With uncorrectable read error rate ~ 10^-15  
        on multiterabyte disk bit rot is the real issue. 
      

      are not those uncorrectable errors detected by the disk hardware
      ?   thats not 'silent'.

      
      whats the rate of uncorrectable AND undetected read errors ?

      
      -- 
john r pierce, recycling bits in santa cruz
    
    Uncorrectable
      read error rate ~ 10^-15- 10^-14. This
    error stays undetected and uncorrectable.

     Also how can you associate disk block ->> file block without
    knowing  fs structure? Also not every hardware include this checksum
    feature under the hood.

    -- 
Alex Ignatov
Postgres Professional: http://www.postgrespro.com
The Russian Postgres Company