This is true even with mons on HDD, though presumably this is a very small cluster with relatively light mon workload
On Nov 16, 2025, at 12:15 PM, Robert Sander <r.sander@heinlein-support.de> wrote:
Hi,
On 11/15/25 22:10, filip Mutterer wrote:
its about my Lab setup. As I didn't have a thought about the space requirements for the root file system I want to know if there is a rule by thumb how much space a cpeh mon might need? rightnow I only have the "whoami" container running in rook-ceph so it does consume nearly no space in the OSD. But how far can I go with only 1.7 GB left on my Raspberry Pi's sdcard?
Do not run something that does a lot of random writes on an SD card.
I have seen Ceph clusters dying because the MON db was not fast enough because of a detoriating SD card.
Regards -- Robert Sander Heinlein Consulting GmbH Schwedter Str. 8/9b, 10119 Berlin
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