2013/1/16 Sage Weil <sage@xxxxxxxxxxx>: > You should not worry, except to the extent that 2 might fail > simultaneously, and failures in general are not good things. Are you talking about 2 OSDs failure (with the same replicated data)? Ok, but it's very very hard. > You could use the first (single) disk for os and logs. You might not even > bother with raid1, since you will presumably be replicating across hosts. > When the OSD disk dies, you can re-run your chef/juju/puppet rule or > whatever provisioning tool is at work to reinstall/configure the OS disk. > The data on the SSDs and data disks will all be intact. OS failure will result in the whole node down. This will cause a rebalance of many TB of data that I prefer to avoid, if possible. I also prefer to avoid a dedicated disks for the OS. I'll loose to much space. With OS in a RAID-1 partition of the first and second spinning disks (the same disks will also act as OSD with another, bigger, partition), OS failure will not bring down anything and I can hot-replace the failed disk. RAID1 will handle OS reconstruction, ceph will handle the cluster rebalance -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
