Hi,
Is there an easy way to stop jsub's "failed to redirect job output" error
messages I receive in my mailbox during the NFS outage, ideally, for all of
the ~50 jobs I have scheduled for my tools?
Unfortunately, currently I receive dozens of mails every hours.
Martin
On Mon, Apr 3, 2023, 1:24 AM Andrew Bogott <abogott(a)wikimedia.org> wrote:
Reminder: The first of these outages will start in
about 30 minutes.
Toolforge NFS will be read-only for as long as 18-19 hours.
On 3/29/23 2:17 PM, Andrew Bogott wrote:
There will be two major Toolforge outages this coming week. Each outage
will cause tool downtime and may require manual restarts afterwards.
The first outage is an NFS migration [0] and will take place on Monday,
beginning at around 0:00 UTC and lasting well into the day, possibly as
late as 19:00 UTC. During this long period, Toolforge NFS will be
read-only. This will cause most tools (for example, anything that writes a
log file) to fail.
The second outage will be a database migration [1] and will take place on
Thursday at 17:00UTC. During this window ToolsDB will be read-only. This
migration should take about an hour but unexpected side-effects may extend
the downtime.
We try very hard to avoid outages of this magnitude, but at this point we
need to choose downtime over the increasing risk of data loss.
More details can be found below.
[0] NFS Outage and system reboots Monday: The existing toolforge NFS
server is running on aging hardware and lacks a straightforward path for
maintenance or upgrading. To improve this we are moving NFS to a cinder+VM
platform which should support easier upgrades, migrations, and expansions
in the future. In order to maintain data integrity during the migration,
the old server will need to be made read-only while the last set of file
changes is synchronized with the new server. Because the NFS service is
actively used, it will take many hours to complete the final sync.
To ensure stable mounts of the new server, every node in Toolforge will
be rebooted as part of this migration. That means that even tools which do
not use NFS will be affected, although most tools should restart gracefully.
This task is documented as
https://phabricator.wikimedia.org/T333477.
[1] DB outage Thursday: As part of the ongoing effort to upgrade
user-created Toolforge databases, we will migrate ToolsDB to a new VM
that will have a more recent version of Debian and MariaDB and will use a
more resilient storage solution.
The new VM is ready, and we plan to point all tools to use it on *Apr, 6
2023 at 17:00 UTC*.
This will involve about *1 hour of read-only time* for the database. Any
existing database connection will be terminated, and if your tool does not
reconnect automatically you might have to restart it manually.
An email will be sent shortly before starting the migration, and when it's
finished.
Please also make sure your tool is connecting to the database using the
canonical hostname *tools.db.svc.wikimedia.cloud* and not any other
hostname or IP address.
For more details, and to report any issue, you can read or leave a comment
at
https://phabricator.wikimedia.org/T333471
For more context you can also check out the parent task
https://phabricator.wikimedia.org/T301949
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