Boston Linux & UNIX was originally founded in 1994 as part of The Boston Computer Society. We meet on the third Wednesday of each month at the Massachusetts Institute of Technology, in Building E51.

BLU Discuss list archive


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[Discuss] SSD drives vs. Mechanical drives



On Wed, May 7, 2014 at 1:09 PM, Richard Pieri <richard.pieri at gmail.com> wrote:
> Bill Bogstad wrote:
>> And checksums can be incorrectly generated/verified by any hardware
>> at any time.I claim that 100% data integrity is impossible. I don't
>> think even ZFS can guarantee 100% data integrity with the right set
>> of bizarre hardware failures in the CPU/RAM of the computer.
>
> ZFS and Btrfs can guarantee 100% data integrity when writes are atomic
> (drives honor sync commands) and ECC RAM is in use and sufficient
> redundant data is available for reconstruction when errors are detected.
> I leave it to the reader to read the ZFS and Btrfs whitepapers that
> explain precisely why they can make these guarantees.

ECC is not 100%.   Nor does it protect against transient CPU/memory
cache errors during
checksum computation.  If you are saying that ZFS can then I will happily read
any whitepaper that you like bcause they are doing some kind of awesome.

Bill Bogstad



BLU is a member of BostonUserGroups
BLU is a member of BostonUserGroups
We also thank MIT for the use of their facilities.

Valid HTML 4.01! Valid CSS!



Boston Linux & Unix / webmaster@blu.org