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