[Gluster-users] to RAID or not?

Mon Jul 4 17:34:10 UTC 2016

2016-07-04 19:25 GMT+02:00 Matt Robinson <m.robinson at sheffield.ac.uk>:
> If you don't trust the hardware raid, then steer clear of raid-6 as mdadm raid 6 is stupidly slow.
> I don't completely trust hardware raid either, but rebuild times should be under a day and in order to lose a raid-6 array you have to lose 3 disks.
> My own systems are hardware raid-6.
> If you're not terribly worried about maximising usable storage, then mdadm raid-10 is your friend.

All of my servers are hardware RAID-6 with 8x300GB SAS 15K (some
servers with 600GB)

A rebuild of a single disk in a 6x600GB SAS RAID-6 takes exactly 22 hours.

This with 15K SAS disks. Now try with 2TB (more than twice the size)
SATA 7200 (less than half speed)