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Hi,

On the morning (UTC) of March 1 we will install some new hardware at the Toolserver. Services will be affected as follows:

Service | Expected impact ----------------------------+-------------------------------- Databases: s3, s4, s6, s7 | User databases unavailable for | < 10 minutes. user-store filesystem | Unavailable for < 10 minutes.

Start time: Tuesday, 1st March, 1PM UTC (estimated) http://time.tcx.org.uk/utc/2011/3/1/13/0

End time: Tuesday, 1st March, 4PM UTC (estimated) http://time.tcx.org.uk/utc/2011/3/1/16/0

Details:

We will install new storage for databases and the user-store filesystem. This requires installing HBAs in three servers: hemlock, cassia, and hyacinth, which requires downtime. We will try to stagger the installation of the two database servers so that those clusters remaining accessible during the maintenance, but user databases will be unavailable while hyacinth is down.

Before the maintenance on hemlock, we will forcibly unmount the user-store filesystem. Any program accessing it at the time will receive an I/O error.

- river.