Bob Proulx wrote:
The FSF admins have isolated and corrected the problem. The report is
that the problem was a faulty SSD in a RAID10 set of four. It was
returning corrupted data and reporting it as good data. That's
exceptionally bad hardware.
Ouch! What type of SSD it was, exactly?
I don't know of any published measurements for this type of error, though Google
has published measures for many other types. In their experience, flash drives
have significantly more uncorrectable errors than hard disk drives, with
different failure characteristics for MLC vs SLC vs eMLC in the field. See:
Schroeder B, Lagisetty R, Merchant A. Flash reliability in production: the
expected and the unexpected. FAST'16, 2016-02-22, 67-80.
https://usenix.org/conference/fast16/technical-sessions/presentation/schroeder
For more details about flash drives problems after cycling power, see:
Zheng M, Tucek J, Qin F, Lillibridge M. Understanding the robustness of SSDs
under power fault. FAST'13, 2013-02-12, 271-84.
https://www.usenix.org/conference/fast13/technical-sessions/presentation/zheng
