Am 02.06.2013 14:47, schrieb Paul Robert Marino: > On Jun 1, 2013 2:09 AM, Steve Bergman <[log in to unmask]> wrote: > > Hi, > > I have a server that I'm getting ready to put into production. It has 4 > SATA drives which I've configured as a 2-drive raid1 array with 2 hot > spares. I'd like the performance of raid10, but need a little better > fault tolerance. Devoting all 4 drives to raid1 seems fault-tolerance > overkill. It's come to my attention that mdadm supports a sort of > raid1e-like "raid10" mode with 3 drives, and that I have a choice of a > near or far configuration. 3 drive raid10 with 1 hot spare sounds > perfect. 2-drive fault tolerance is perfect. And the improved > performance sound good. > [...] > Steve Bergman> First of all what do you mean by raid 10 do you mean Raid 1+0 or striped > raid 5s which is some times called raid 10, 5+0 or 50 > > Either case the drive numbers don't add up. > For raid 1+0 with hot spares you need an even number of drives plus your > spares. > No, he means the RAID-1e implementation provided by the kernel. https://en.wikipedia.org/wiki/Non-standard_RAID_levels#RAID_1E Regards, Florian Philipp