On 10/03/2013 12:40 PM, Andy Paluch wrote: > Don't you have to take down a ceph node to replace defective drive? If I have > a > ceph node with 12 disks and one goes bad, would I not have to take the entire > node down to replace and then reformat? > > If I have a hotswap chassis but using just an hba to connect my drives will > the > os (say latest Ubuntu) support hot-swapping the drive or do I have to shut > it > down to replace the drive then bring ip and format etc.
Linux supports hotswap. You'll have to restart an osd, but not reboot the node. The issue with cluster rebalancing is bandwidth: basically, sata/sas backplane on one node vs (potentially) the slowest network link in your cluster that also carries data traffic for everybody. There's too many variables involved, you figure out the balance between ceph replication and raid replication for your cluster & budget. -- Dimitri Maziuk Programmer/sysadmin BioMagResBank, UW-Madison -- http://www.bmrb.wisc.edu
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