Hello,
We have a 6-node ceph cluster, all of them have osd running and 3 of them (ceph-1 to ceph-3 )also has the ceph-mgr and ceph-mon. Here is the detailed configuration of each node (swap on ceph-1 to ceph-3 has been disabled after the alarm):
# ceph-1 free -h
total used free shared buff/cache available
Mem: 187Gi 38Gi 5.4Gi 4.1Gi 143Gi 142Gi
Swap: 0B 0B 0B
# ceph-2 free -h
total used free shared buff/cache available
Mem: 187Gi 49Gi 2.6Gi 4.0Gi 135Gi 132Gi
Swap: 0B 0B 0B
# ceph-3 free -h
total used free shared buff/cache available
Mem: 187Gi 37Gi 4.6Gi 4.0Gi 145Gi 144Gi
Swap: 0B 0B 0B
# ceph-4 free -h
total used free shared buff/cache available
Mem: 251Gi 31Gi 8.3Gi 231Mi 211Gi 217Gi
Swap: 124Gi 3.8Gi 121Gi
# ceph-5 free -h
total used free shared buff/cache available
Mem: 251Gi 32Gi 14Gi 135Mi 204Gi 216Gi
Swap: 124Gi 4.0Gi 121Gi
# ceph-6 free -h
total used free shared buff/cache available
Mem: 251Gi 30Gi 16Gi 145Mi 204Gi 218Gi
Swap: 124Gi 4.0Gi 121Gi
We have configured swap space on all of them, for ceph-mgr nodes, we have 8G swap space and 128G swap configured for osd nodes, and our zabbix has monitored a swap over 50% usage for ceph-1 to ceph-3, but our available space are still around 140G against the total 187G. Just wondering whether the swap space is necessary when we have lots of memory available?
Thanks very much for your answering.
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