[Toolserver-announce] Maintenance: user-store; all database clusters tonight

[River Tarnell]

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(I have the impression that our maintenance notices are not always very clear, 
since people are sometimes surprised when we carry out previously-announced 
maintenance.  So, here's a new and hopefully improved notification format.)

This is a maintenance notification for tonight (Saturday 11th) UTC. The 
following services will be affected:

Service				| Expected impact
- --------------------------------+-----------------------------------
s1 cluster			| User databases unavailable for < 10 minutes
s2 cluster			| Entire cluster unavailable for < 10 minutes
s3 cluster			| User databases unavailable for < 10 minutes
s4 cluster			| User databases unavailable for < 10 minutes
s5 cluster			| Entire cluster unavailable for < 10 minutes
s6 cluster			| User databases unavailable for < 10 minutes
user databases (sql)		| Unavailable for < 10 minutes
user-store filesystem		| Unavailable for < 20 minutes
NFS, LDAP, misc services:	| None expected, but at risk during maintenance.
  SVN, phpMyAdmin, SGE, tsbot,	|
  mail forwarding, DNS,		|
  sql-toolserver database	|
All other services		| No impact

Start time:	Sunday, 12th September, 12AM UTC
End time:	Sunday, 12th September, 3AM UTC

Details:

Tonight we will complete the upgrade to Solaris 10 Update 9 on the remaining 
servers.  This requires under 10 minutes downtime while each system reboots.  

Since we will be upgrading the primary server in each cluster, which holds user 
databases, these will be unavailable during the reboot.  Access to replicated
databases will not be interrupted, since queries will be directed to the 
alternative server while one is rebooted.

The exception is s2/s5 and sql (user databases), which currently have only one 
server.  They will therefore be unavailable during the reboot.

	- river.
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