The NFS servers used for scratch and maps mounts (/data/project and /home in the maps
project and /data/scratch in other projects) will be going offline for a short time
tomorrow 2021-07-01 at around 1600 UTC to move the mounts to DRBD synced volumes. The
current setup causes odd issues during failover including data loss and stale files left
behind. The process taking place is one of those failovers so there may be some files that
were previously deleted that need deleting again present and similar anomalies.
I plan to reboot the maps project servers to make sure they have their mounts and
processes restored as best as possible. The scratch mounts should be less impactful. If
you use scratch, just be aware that it will go offline for a bit and will be back with
some possible quirks. After that, the data should become far more stable and properly
synced between the two systems. The process could start later than 1600 UTC if there are
sync issues initially as I try to get as much of the data as possible transferred.
More details here
https://phabricator.wikimedia.org/T224747
<https://phabricator.wikimedia.org/T224747>
Brooke Storm
Staff SRE
Wikimedia Cloud Services
bstorm(a)wikimedia.org
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