Per Jessen wrote:
Lorenzo Cerini wrote:
As i told before, tht's not the point. I was talking about the possibilities to have a second disk failure before you can rebuild the first array, say 24 hours.
I am hoping that a rebuild would take a lot less time than that :-) The longer the rebuild, the higher the risk of a second disk failure. And what Ken described would surely increase the risk too.
I think it's easier somebody forget to be root and start 'rm /var'. One disk failure plus backup is enough.
I have to disagree. Restoring a backup is an emergency recovery measure. The whole idea of being able to survive the two-disk failure is avoiding that particular emergency and being able to maintain operation without restoring backups etc.
/Per Jessen, Zürich
I have to disagree too. Wasting 7 disk space, without performance improvement is terrible. So go with raid10 or buy a raid6 card if you really believe you are going to have a double failure within a few a hours. Otherwise have a good raid5 and if a disk fails rebuilt the array. L.