On 2013-10-02 07:35, Loic Dachary wrote:
Hi, I would not use RAID5 since it would be redundant with what Ceph provides.
I would not use raid-5 (or 6) because its safety on modern drives is questionable and because I haven't seen anyone comment on ceph's performance -- e.g. openstack docs explicitly say don't use raid-5 because swift's access patterns are the worst case for raid.
I would consider (mdadm) raid-1, dep. on the hardware & budget, because this way a single disk failure will not trigger a cluster-wide rebalance.
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