[ceph-users] Re: What is a pgmap?

I thought it was a method (the method?) to know if a PG comes back from a crashed OSD/host, to know if it was up-to-date or old since it would have an older timestamp.

Thanks. That's a reasonable theory. Maybe I'll look in the code and see if I can confirm it. And it means on my cluster, once an hour would probably be sufficient.

I was sure it was updated exactly once per second.

Because there's an infamous cluster log message every time the pgmap updates, I know for me it is about 10 times a minute, in a pattern that is neither periodic nor random. Maybe once per second is the maximum frequency and it depends upon how frequently PGs are written to. -- Bryan Henderson San Jose, California