Hi,
I'm testing MDS expasion,
my original environment has 3 MON, 2 MDS (one active, one standby), 10
OSD which are built on 15 physical machines.
the following is my step to test add/remove active MDS:
Step1: check mds status
root@MON1:~# ceph mds dump -o -
4097: 192.168.200.184:6800/2095 '0' mds0.1 up:active seq 66
4107: 192.168.200.185:6800/1911 '1' mds-1.0 up:standby seq 2
There are two mds, one is active, another is standby
Step2: ceph mds set_max_mds 2
Step3: ceph -s
2011-04-22 08:33:03.836554 mds e18: 2/2/2 up {0=up:active,1=up:active}
or
root@MON1:~# ceph mds dump -o -
max_mds 2
in 0,1
up {0=4097,1=4107}
failed
stopped
4097: 192.168.200.184:6800/2095 '0' mds0.1 up:active seq 66
4107: 192.168.200.185:6800/1911 '1' mds1.1 up:active seq 25635
Step4: I want to set one mds to standby, so I execute "ceph mds set_max_mds 1"
root@MON1:~# ceph mds set_max_mds 1
2011-04-22 08:35:29.964667 mon <- [mds,set_max_mds,1]
2011-04-22 08:35:30.133274 mon0 -> 'max_mds = 1' (0)
Step5: Then I check mds status
root@MON1:~# ceph mds stat
2011-04-22 08:39:04.160139 mon <- [mds,stat]
2011-04-22 08:39:04.160823 mon0 -> 'e19: 2/2/1 up {0=up:active,1=up:active}' (0)
^^^^^^
What does the 2/2/1 means ?
I found that the number of active MDS still remains two...
Could you tell me how to reduce the active mds number from 2 to 1...?
and what the 2/2/1 means ?
Thanks a lot ! :)
Best Regards,
Annie
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