Disk Space for Reconfiguration
When changing cluster assignments or hash bucket sizes, ample disk space must be available on all AMPs. If sufficient space is not available, Teradata Database stops. To recover, reinitialize Teradata Database using the sysinit utility. Note that reinitializing the system destroys all data, which would need to be restored from an archive backup.
Teradata recommends the following availability:
For online reconfiguration, additional disk space is needed for the Reconfiguration Journal. The space used for this is determined by the RECONFIG command JOURNAL MAXPERMSPACE setting. For more information, see “RECONFIG” on page 258.