IO Error in storage mount point

Dear Team,

I have T4 server in that i have mounted luns from sun storage 6180.

I am getting below errors in mount points.

PUNE_FMCC@root@fmcc03 # cd /fms_data2

PUNE_FMCC@root@fmcc03 # ls

.: I/O error

PUNE_FMCC@root@fmcc03 # cd /ft_db1

PUNE_FMCC@root@fmcc03 # ls

lost+found  oradata     ra

PUNE_FMCC@root@fmcc03 # cd /fms_data1

PUNE_FMCC@root@fmcc03 # ls

.: I/O error

PUNE_FMCC@root@fmcc03 # cd /ft_db2

PUNE_FMCC@root@fmcc03 # ls

lost+found  oradata

PUNE_FMCC@root@fmcc03 # df -h

Filesystem             size   used  avail capacity  Mounted on

/dev/md/dsk/d10         48G   9.5G    38G    20%    /