Hi all, We have a ceph cluster only use rbd. The cluster contains several group machines, each group contains several machines, then each machine has 12 SSDs, each ssd as an OSD (journal and data together). eg: group1: machine1~machine12 group2: machine13~machine24 ...... each group is separated with other group, which means each group has separated pools.
we use Hammer(0.94.6) compiled with jemalloc(4.2). We have found that when we add a new group machine, the other group machine's memory increase 5% more or less (OSDs usage). each group's data is separated with others, so backfill only in group, not across. Why add a group of machine cause others memory increase? Is this reasonable?
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