UNSTABLE: test the dynamic tree partitionning with multiple Ceph MDS [feedly]

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UNSTABLE: test the dynamic tree partitionning with multiple Ceph MDS
// Ceph

Quick tip to enable the dynamic subtree tree partitionning with multiple Ceph MDS servers.

If you want this to take effect during cluster creation edit your ceph.conf:

[mds]  mds max =  5  

Then restart your MDSs, they will be all active.

Or inject the following command:

bash $ ceph mds set_max_mds 5 max_mds = 5

Before and after:

```bash $ ceph -s

cluster 04c9ddfb-a420-4fac-bbee-997fd182f527   health HEALTH_OK   monmap e1: 1 mons at {ceph001=192.168.0.100:6789/0}, election epoch 1, quorum 0 ceph001   mdsmap e20: 1/1/1 up {0=ceph006=up:active}, 4 up:standby   osdmap e103: 29 osds: 29 up, 29 in    pgmap v18261: 1216 pgs, 4 pools, 2145 bytes data, 23 objects          1237 MB used, 26771 GB / 26773 GB avail                 6 active+clean+replay              1210 active+clean  

$ ceph -s

cluster 04c9ddfb-a420-4fac-bbee-997fd182f527   health HEALTH_OK   monmap e1: 1 mons at {ceph001=192.168.0.100:6789/0}, election epoch 1, quorum 0 ceph001   mdsmap e30: 5/5/5 up {0=ceph006=up:active,1=ceph005=up:active,2=ceph003=up:active,3=ceph002=up:active,4=ceph004=up:active}   osdmap e103: 29 osds: 29 up, 29 in    pgmap v18274: 1216 pgs, 4 pools, 5893 bytes data, 85 objects          1239 MB used, 26771 GB / 26773 GB avail              1216 active+clean  

```

Now enable the subtree partitionning with the following flag:

[mds]  mds bal frag = true  

For all the options.

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