On Wed, Dec 21, 2005 at 12:55:47PM +1100, Christopher Smith wrote:

Sebastian Kuzminsky wrote:

quoted

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?