drive selection for disk arrays

[David Christensen]

Jacques Foucry wrote:

> ALWAYS (when it's possible) buy and use disks from different brand 
> (mix seagate, WD, etc..) in order to avoid same series and same 
> MTBF.
> 
> I know this to late in this case, but keep this in mind.
> 
> I know this will not help in this case, please excuse my
> intervention if it's inappropriate.


To date, most of my arrays have been composed of similar drives.  But, I 
run a SOHO LAN and have limited experience.  I have been wondering about 
using dissimilar drives to prevent simultaneous common-mode failures.


Backblaze publishes statistics for individual drives:

https://www.backblaze.com/blog/hard-drive-stats-q2-2019/


I would be curious to read any data or reports comparing arrays of 
similar drives vs. arrays of dissimilar drives.


Have anyone seen a failure involving multiple similar drives all failing 
in the same mode at the same time?


David