Piyush Gupta, chief executive officer at DBS Group Holdings, said in a letter to the bank’s client base, which was published on its website, that a repair job undertaken by IBM went wrong and led to the failure in its systems.
According to IBM, the use of an outdated repair procedure resulted in the outage taking place.
No data is thought to have been lost during the incident, which occurred on July 5th.
In his message, Mr Gupta said: “So far, we understand from IBM that an outdated procedure was used to carry out the repair.
“In short, a procedural error in what was to have been a routine maintenance operation subsequently caused a complete system outage.”
Meanwhile, in a separate statement, IBM said it has now “taken steps to enhance training of our personnel related to current procedures and brought in experts from our global team to provide further assistance”.
IBM and DBS are believed to be working together to ensure that incidents of this sort do not happen in the future.
By Jim Ottewill