Archive problem with ontape & onLine 7.1

Hi everyone, We are a new Informix site running onLine 7.1 on a Sun Sparc 20. I have been playing with the Ontape utility trying to perform backups and have encountered the following problem: * The backup seems to work fine using ontape -s -L 0 * The archive is committed by the onLine engine * The restore procedure invoked with ontape -r goes through the motions and prints tape archive data, Dbspaces, Chunks etc. * But when it comes to the crunch the thing bombs out with the following message: 'Physical restore failed - function read archive backup failed code 1 errno 4' NB. The tape unit is an Exabyte Exb-8500 8mm cartridge unit and works fine with the UNIX archive utilities. I have tried archiving with several different blocking factors as this is the one parameter that is mentioned in the Informix literature as possibly being problamatic. Thanking You, Tom rte-eng@internet-eireann.ie