root cannot access the directory

[new2linuxworld]

hi,
while accessing a directory 'u01/app' as root user, I get the

following message:
bash: cd: app: permission denied

and then I tried to give the following permissions with the

command as root user:
chmod 777 /u01/app
I get the following message:
chmod: cannot access '/u01/app': Input/output error

can anybody fix this issue...

[devils casper]

Execute this

ls -l /u01/app

Post output here.

[new2linuxworld]

ls -l /u01/app

here is the output

ls: /u01/app: Input/output error

[devils casper]

Which Linux Distro are you using? Something is wrong with FileSystem. Boot up in Recovery Mode and run fsck on partition having /u01/app.

[Aditya Immaneni]

Looks like either the file system is not mounted or there is a problem accessing the file system. Run the command mount and see if the filesystem is mounted.

ls -l /u01/app

here is the output

ls: /u01/app: Input/output error