linux : svn: E200030: sqlite: disk I/O error

When I do SVN up from I get the following error

[amp@ucln-amp-04v apps]$ svn up
  svn: E155004: Working copy '/path/install' locked.
  svn: E155004: '/path' is already locked.
  svn: run 'svn cleanup' to remove locks (type 'svn help cleanup' for details)

And I did svn cleanup, I get this error

[amp@ucln-amp-04v apps]$ svn cleanup
svn: E200030: sqlite: disk I/O error
svn: E200030: sqlite: disk I/O error
svn: E200030: no such savepoint: s0, executing statement 'RELEASE   s0'
svn: E200030: no such savepoint: s0, executing statement 'ROLLBACK TO s0'

I even checked diskspace.

[amp@ucln-amp-04v apps]$ df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda5             4.0G  3.6G  178M  96% /
tmpfs                  12G   61M   12G   1% /dev/shm
/dev/sda1             2.0G  189M  1.7G  10% /boot
/dev/sda2             7.9G  524M  7.0G   7% /var
/dev/sdb1              99G   94G     0 100% /u01

what could be wrong? How can I get it working ?