On Wed, Dec 21, 2005 at 12:55:47PM +1100, Christopher Smith wrote: > Sebastian Kuzminsky wrote: > >I just created a RAID array (4-disk RAID-6). When "mdadm -C" returned, > >/proc/mdstat showed it syncing the new array at about 17 MB/s. "vmstat 1" > >showed hardly any blocks in or out, and an almost completely idle cpu. > > This isn't really relevant to your questions but... > > Why would you use RAID6 and not RAID10 with four disks ? I was wondering the same thing. It's true that RAID6 is guaranteed to still run degraded after losing 2 devices, whereas a RAID10 on 4 devices could only lose 1 device from each RAID1. So there is some small extra redundancy there. But how does the performance for read and write compare?
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