jdd wrote:
Le 14/12/2016 à 11:40, Per Jessen a écrit :
jdd wrote:
my main concern on raid is unused data control, that is verification of the integrity of unused data on disk (to prevent unexpected multi disk failure).
Huh? You mean check unused data
data
or unused space? I don't see what you
would gain and I am not aware of any enterprise class hardware that will do it. Usually SMART (and other vendor-specific diagnostics) tests are run regularly, that's about it. If you cannot rely on your data being written accurately to your disk, all bets are off.
it's certainly a problem. I read recently a discussion about it (but don't remember the exect name):
loook at this
http://sysadmin1138.net/mt/blog/2012/12/how-multi-disk-failures-happen.shtml
Yes, multi disk failures definitely do happen, the risk increases with the drive size. That's why we use DRBD mirror copies, hot spares and RAID6, staged drive purchases, and make sure each array has a good mix of different drive ages. -- Per Jessen, Zürich (2.6°C) http://www.cloudsuisse.com/ - your owncloud, hosted in Switzerland. -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org