Mon, 15 Feb 2016 22:03:13 +0100 Karel Gardas <gard...@gmail.com> > > ..And therefore you need enterprise disks because they behave "cleanly", as > > when using those only, essentially full softraid QoS is maintained at all > > times. > > Interesting! I've understand Nick excellent email in completely > reversed sense.
That does not reverse the advice however. Double slow speed read again carefully ;-) > I understood it in "use consumer drives which fail > really slowly and with degraded performance which will give you a > chance to notice it at all. This is not the concept. It is more an important technological prerequisite many people don't know exists in the hardware RAID world. > With enterprise, your drives may fail too > quickly so there is a danger of failing drive in a array which is just > rebuilding after another drive failure few hours ago". That's not the takeaway advice. That would be: have in mind some controllers reject a drive which is still operational but does not meet the controller timeout. More like: hardware RAID controllers twist your hands to buy enterprise class disks and replace them more diligently before they actually reach the fail state on continuous usage timing parameters. Plan for your use case, and consult the man page and respective source code on implementation details. And flash storage disks are still unreliable compared to spinning hard drives.
