How to set MDS log size

[Madhusudhana U <madhusudhana.u.acharya@gmail.com>]

Hi all,
In my MDS system of ceph cluster, my entire root partition is full bcz of 
one big mds log file


[root@ceph-node-7 ceph]# du -sh *
0       mds.admin.log
27G     mds.ceph-node-7.log

[root@ceph-node-7 ceph]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda2              39G   39G     0 100% /
tmpfs                  24G     0   24G   0% /dev/shm
/dev/sda1             2.0G   76M  1.8G   5% /boot
/dev/sda5              19G  409M   18G   3% /ceph

How to set a max size for mds log ? does it auto rotate ? Bcz my root 
partition is full, will this affect read/write performance in
my ceph cluster?

Thanks
Madhusudhana