[Toolserver-l] Maintenance on hyacinth (s3/s4/s6); login/web servers

[River Tarnell]

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Hi,

Later tonight we will upgrade the OS on hyacinth (s3/s4/s6 server).  This will 
involve ~30 minutes downtime, but should have no impact on users.

We will also upgrade the OS on willow at the same time, which should require
<10 minutes downtime.  If there are no problems with that upgrade, we will also
upgrade the web servers (wolfsbane & ortelius); but the cluster software makes 
this upgrade more intricate, so it may not be completed tonight.  That will 
have no impact on users, since web requests will be served by the other server 
while one is being upgraded.

This maintenance will take place around 12AM UTC on Saturday (11th).

	- river.
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