Hello, On Wed, 17 Feb 2016 11:18:40 +0000 Ed Rowley wrote: > Hi, > > We have been running Ceph in production for a few months and looking > at our first big expansion. We are going to be adding 8 new OSDs > across 3 hosts to our current cluster of 13 OSD across 5 hosts. We > obviously want to minimize the amount of disruption this is going to > cause but we are unsure about the impact on the crush map as we add > each OSD. > So you are adding new hosts as well? > From the docs I can see that an OSD is added as 'in' and 'down' and > wont get objects until the OSD service has started. But what happens > to the crushmap while the OSD is 'down', is it recalculated? are > objects misplaced and moved on the existing cluster? > Yes, even more so when adding hosts (well, the first OSD on a new host). Find my "Storage node refurbishing, a "freeze" OSD feature would be nice" thread in the ML archives. Christian > We think we would like to limit the rebuild of the crush map, is this > possible or beneficial. > > Thanks, > > Ed Rowley > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > -- 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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