We have 5 node clusters with EC 4+1 and use bluestore since last year from
Recently we migrated all our platforms to luminous 12.2.2 and finally all
OSDs migrated to ceph-volume simple type and on few platforms installed
ceph using ceph-volume .
Now we see two times more traffic in read compare to client traffic on
migrated platform and newly created platforms . This was not the case in
older releases where ceph status read B/W will be same as client read
Some network graphs :
*Client network interface* towards ceph public interface : shows *4.3Gbps*
[image: Inline image 2]
*Ceph Node Public interface* : Each node around 960Mbps * 5 node =* 4.6
Gbps *- this matches.
[image: Inline image 3]
Ceph status output : show 1032 MB/s =* 8.06 Gbps*
cn6.chn6us1c1.cdn ~# ceph status
mon: 5 daemons, quorum cn6,cn7,cn8,cn9,cn10
mgr: cn6(active), standbys: cn7, cn9, cn10, cn8
osd: 340 osds: 340 up, 340 in
pools: 1 pools, 8192 pgs
objects: 270M objects, 426 TB
usage: 581 TB used, 655 TB / 1237 TB avail
pgs: 8160 active+clean
client: *1032 MB/s rd*, 168 MB/s wr, 1908 op/s rd, 1594 op/s wr
Write operation we don't see this issue. Client traffic and this matches.
Is this expected behavior in Luminous and ceph-volume lvm or a bug ?
Wrong calculation in ceph status read B/W ?
Please provide your feedback.
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