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Ralf Bertling wrote: Two things to be aware of with this type of statistical info ( also true for MTBF ),I am not an expert, but the MTTDL is in tousands of years when using raidz2 with a hot-spare and regular scrubbing. If you add zpool send/receive and geographically dislocated severs, this may be better than optical media, because you detect the errors early. It is statistical info and it is an average, it does not give any guarantee that a catastrophic event will not happen in the next hr. Secondly this figure is defined on subsystem level, if the box goes up in smoke the thousands of years MTTDL is of no use! So the moral of the story is to always plan for a second copy of your data if you want to design resilience from a data set point of view. -- Regards Peter Brouwer, Sun Microsystems Linlithgow Principal Storage Architect, ABCP DRII Consultant Office: +44 (0) 1506 672767 Mobile: +44 (0) 7720 598226 Skype : flyingdutchman_,flyingdutchman_l |
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