[Discuss] SSD drives vs. Mechanical drives

[kentborg at borg.org (Kent Borg)]

On 05/07/2014 07:15 AM, Jerry Feldman wrote:
> Indeed. I have been doing that for years. Disks from a single lot 
> under a similar usage have a higher likelihood of simultaneous 
> failure. We had a simultaneous disk failure at the BLU a few years ago.

Ironically, when one buys a disk, one hopes it is a good one, that it 
was built right. And when one buys several disks, one hopes that they 
are all good. Precision manufacturing and all.

Which means they will not have a premature death, but only quit when 
they wear out. Which might happen at about the same time. Aggravated by, 
say, replacing one and stressing the other old one to rebuild the array. 
In some idealized world, one would look at a perfectly healthy array, 
and retire perfectly good disks on a schedule. And that first disk 
should be retired frustratingly early--gotta break up that original 
synchronized cohort.

-kb