VCS group state Parital

Hi I check the VCS group state show parital , and I have no idea why happen 

root@devuaedms11 # hastatus -sum

-- SYSTEM STATE
-- System State Frozen

A devuaedms11 RUNNING 0
A devuaedms12 RUNNING 0

-- GROUP STATE
-- Group System Probed AutoDisabled State

B Documentum devuaedms11 Y N PARTIAL
B Documentum devuaedms12 Y N PARTIAL
B Documentum_ENV_B devuaedms11 Y N PARTIAL
B Documentum_ENV_B devuaedms12 Y N PARTIAL
B MNICB_SITgroup devuaedms11 Y N ONLINE
B MNICB_SITgroup devuaedms12 Y N ONLINE
B cvm devuaedms11 Y N ONLINE
B cvm devuaedms12 Y N ONLINE
B documentum_bkup devuaedms11 Y N ONLINE
B documentum_bkup devuaedms12 Y N OFFLINE

-- RESOURCES FAILED
-- Group Type Resource System

C Documentum_ENV_B ContentServer ContentServer_B devuaedms11
C Documentum_ENV_B ContentServer ContentServer_B devuaedms12

Check the engine_A log to show this message

VCS INFO V-16-2-13075 (devuaedms11) Resource(JavaMethodServer) has reported unexpected OFFLINE 1 times, which is still within the ToleranceLimit(1).