Hi All, Would anybody have an idea a) If it’s possible and b) if it’s a good idea to have more EC chunks than the total number of hosts? For instance if I wanted to have a k=6 m=2, but only across 4 hosts and I wanted to be able to withstand 1 host failure and 1 disk failure(any host), would a crush map rule be able to achieve that? Ie It would first instruct data to be 1st split evenly across hosts and then across OSD’s? If I set the erasure profile failure domain to OSD and the crushmap to chooseleaf host, will this effectively achieve what I have described? I would be interested in doing this for two reasons, one being for better increased capacity than k=2 m=2 and the other is that when I expand this cluster in the near future to 8 hosts I won’t have to worry about re-creating the pool. I fully understand I would forfeit the ability to withstand to lose 2 hosts, but I would think this to be quite an unlikely event having only 2 hosts to start with. Many thanks, Nick |
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