On 8 Apr 2018, at 16:25, tschador@posteo.de wrote:

Hi,

every time Tor is restarted (for example after upgrading) the HSDir flag of my relay (6A7551EEE18F78A9813096E82BF84F740D32B911) is lost for 4 days. Why?

The minimum uptime for HSDirs is 96 hours (4 days): https://gitweb.torproject.org/torspec.git/tree/dir-spec.txt#n2524

Why 4 days?

HSDirs rotate every 24 hours. If a relay has been up for 4 days, then it is likely to be up for the next 24 hours. So it is given the flag.

(If a HSDir goes down, it takes a few hours for clients and services to find out it is down. If too many HSDirs go down at the same time, the services assigned to those HSDirs are unreachable for a few hours. The minimum uptime reduces the risk of HSDir downtime.)

T