It turned out BIOS settings on phab1001 were such that disks were running
under "legacy IDE" mode and write cache was turned off.
This was really bad for performance. Changing that in BIOS unfortunately
also means complete data loss.
So we had to go back to phab1003 yesterday, fix phab1001, reima
This has happened. The Phabricator production server is now phab1001
(again) and not phab1003 anymore.
Phabricator now runs on Debian stable (buster) and PHP 7.3.
https://phabricator.wikimedia.org/T238956 shows all the related patches
and can be used to report issues.
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Next Wednesday, December 4th, at 00:00 UTC (4pm San Francisco) there will be
a Phabricator upgrade window that might last up to 2 hours.
While we expect downtime to be much shorter than that Phabricator might be
unreachable in that time frame.
We are switching the production Phabricator server to
