Hello,   First you have to make sure you have enough free space to account for the member you are removing.  Depending on the load on the group, there could be an impact on performance.  As more data is moved off the member being removed the load will have to be handled by the remaining two members.  If the group is very lightly loaded the impact will be minimal.   The process to move data off is handled at a lower priority to I/O requests from servers.   I would suggest that you first create a temporary pool, then move that member to that pool first.   Once it is completely moved over you can delete it from the group.   This makes it easier to undo the process in case you find the impact is too much or you change your mind.  You can cancel the move, or when it finishes if you discover that you needed that member, you can very quickly join it back in with the "Merge Pools" option.   Regards,   Don 
We have 1 pool with 3 membersI want to delete 1 member from a group.Is it wisely to do this in production time? or wil this slow down the performance on my group? 
Delete 1 member from 3 EqualLogic members