Hello, On Mon, 29 Aug 2016 09:46:53 +0800 Rob Gunther wrote: > I learned of Ceph only a few weeks ago, think the concept is really cool. > > I wanted to try my hand at it, but did not want to try setting it all up > with VM boxes. > > So I put together a system using 7 physical nodes, using little ARM based > computers. > > I got four Banana Pi <http://www.bananapi.org/p/product.html>, which have > one SATA port, 1gb of ram. Boots of 8gb SD card. These are Ceph OSD nodes > with 3tb hard drives. > > I got three ODROID-C2 > <http://www.hardkernel.com/main/products/prdt_info.php> units to use as > Ceph mon, 2gb of ram, 8gb SD cards for booting and 64gb of eMMC memory. > > I got a basic cluster up, but things go bad quick. I can't keep the OSD > nodes up, the OSD logs look like mumbo jumbo to me for the most part. > > Photo of the little setup available here if you are interested. > > https://dl.dropboxusercontent.com/u/12473059/Ceph/1stCluster.jpg > > I learned a few things and am going to blow everything away and start again. > > One question I have for the group is this. > > Do you really need to make an entry in ceph.conf telling the cluster of the > location of each osd.X ? > > [osd.1] > host = node-01 > > [osd.2] > host = node-02 > > [osd.3] > host = node-03 > > > I used ceph-deploy to set everything up and it did not add these entries. > I have seen online some people mention it, some people do not. I looked up > some sample ceph.conf and some have it and some do not. > Like with so many things, the answer is "it depends". If ceph-deploy works for you, count yourself lucky and don't bother with the OSD details in the conf file. ceph-deploy uses "magic" to do these things. > Seems like adding that would be a major PITA anytime you make a change to > the cluster you would need to update that file on all nodes. Not really, the OSD part is only relevant for the respective node, so only changes (additions/removals) of OSDs that are pertinent to the local node would need to be reflected in the ceph.conf of that host. Christian -- Christian Balzer Network/Systems Engineer chibi@xxxxxxx Global OnLine Japan/Rakuten Communications http://www.gol.com/ _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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