ACSLS Drive issue

ACSLS drive down in Solaris medi aserver. it's shared to another media server also. Both media server this drive down. Once up that drive going to tacking to media and it's going to down immediatly..

Jul 22 06:16:12 Mediaserver acsd[5156]: [ID 115203 daemon.notice] DecodeDismount: ACS(2) driveid 1,1,1,3, Actual status: STATUS_SUCCESS
Jul 22 06:16:16 Mediaserver ltid[4785]: [ID 325234 daemon.error] Operator/EMM server has DOWN'ed drive 01010103_lto3 (device 4)

Please suggest on this issue..