From my point of view, preventing clients from being added to blacklists may be better if you are in a poor network environment. AFAIK the server will send signals to clients frequently. And it will add someone to the blacklist if it doesn't receive a reply. <380562518@qq.com> 于2020年7月8日周三 下午3:01写道：

Hi all.

If cephfs client is in a slow or unreliable network environment, the client will be added to OSD blacklist and OSD map, and the default duration is 1 hour. During this time, the client will be forbidden to access CEPH. If I want to solve this problem and ensure client's normal I/O operation is not interrupted, are the following two options feasible? which one is better?

1. Set "mds_session_blacklist_on_timeout" to false, and forbid to add slow clients to blacklist;

2.Just reduce the duration of slow clients joining the blacklist, and change the default 1 hour to 5 minutes. (set the value of "mon_osd_blacklist_default_expire" to 5 minutes）

Are the two schemes feasible? Will it have a great impact on the data security and integrity of CEPH? Can you give me some suggestions?

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