HELP!!

[redhat.zhou]

i meet a problem ! who knows how to solve ? thanks!!


[oracle at oracle250 bdump]$ ps -ef|grep ora_
-bash: ps: command not found
-bash: /bin/grep: Input/output error
[oracle at oracle250 bdump]$ ls
-bash: /bin/ls: Input/output error
[oracle at oracle250 bdump]$ ls
-bash: /bin/ls: Input/output error
[oracle at oracle250 bdump]$ cd ..
[oracle at oracle250 bjsw2]$ ls
-bash: /bin/ls: Input/output error
[oracle at oracle250 bjsw2]$ ll
-bash: /bin/ls: Input/output error

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