This is a proactive message to summarize best practices and options working with monitors, especially in a larger production environment (larger for me is > 3 racks).
I know MONs do not require a lot of resources, but prefer to run on SSDs for response time. Also that you need an odd number, as you must have a simple majority present. MON uses leveldb and that data is constantly changing, so traditional backups are not relevant/useful.
There has been uncertainty whether more than 3 MONs will cause any performance issues in a cluster. To that extent, may I ask from both the Ceph development community and the excellent power user contributors on this list:
- Is there any performance impact to running > 3 MONs?
- Is anyone running > 3 MONs in production and what are your experiences?
- Has anyone had a need to back up their MONs and any recovery experience, such as http://blog.widodh.nl/2014/03/safely-backing-up-your-ceph-monitors ?
Our cluster has 8 racks right now, and I would love to place a MON at the top of the rack (maybe on SDN switches in the future - why not?). Thank you for helping answer these questions.
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Alex Gorbachev
Storcium
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