On the weekend of the 5th/6th July, and the 16h/17th August, the storage team will be undertaking replacement of the core SAN switches. This will affect a number of databases/services and means that they will be unavailable during this period.
The work on Saturday 16th/17th August is scheduled to take place from 9am and the storage team plan to complete it by Saturday evening. The 'at risk' period for the databases/services extends until Sunday.
Note some sites will be taken down on Friday 15th August in preparation.