Tree-closure Downtime notice for Thursday June 16, 2011 - 4am - 8am PDT

[Lukas Blakk]

Trees will be closed for downtime so that we can land the following:

1. https://bugzilla.mozilla.org/show_bug.cgi?id=662396 -- Fix time on
dm-wwwbuild01

2. https://bugzilla.mozilla.org/show_bug.cgi?id=600980 -- Set
journal_mode = WAL for dirty places profiles -- *This mean new
performance numbers will start on Thursday morning after the downtime*

3. https://bugzilla.mozilla.org/show_bug.cgi?id=649123 -- Run ANALYZE on
dirty places.sqlite files -- *This mean new performance numbers will
start on Thursday morning after the downtime*

4. https://bugzilla.mozilla.org/show_bug.cgi?id=663568 -- reboot the DNS
and DHCP servers in scl1 -- Rebooting these servers has been shown to
burn builds in the past, requires a short (~5min) outage to reboot these
servers to allow updates to take effect.

5. https://bugzilla.mozilla.org/show_bug.cgi?id=663963 -- change LDAP to
see if that speeds up mercurial -- This change should be entirely
transparent. Hg processes that are running at the time that the change
was made will have already loaded the NSS LDAP module and will continue
to use it until they exit. The only issue to be aware of is that
changes to hg access (group membership, or the creation of a new
account) will not automatically propagate to the hg servers the way they
do now. If any hg access changes need to be pushed urgently, we can do
that manually.

If anyone has a reason not to proceed with this downtime, please let me
know.

Thank you,
Lukas