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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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Hi,
We have replaced sendmail on the Solaris login servers with the Postfix MTA.
This should not make any difference to users, except that it should fix the
problem with cron mails not being delivered.
- river.
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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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Hi,
If you are currently using disk space on user-store, please check your usage
and delete any unneeded files. There is only 70GB of space left on the volume
now.
(I will produce a more detailed report of who's using space later...)
- river.
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