Hi everyone, I recalled the figure of 120GB and sought to verify its source:: - It appears to originate from the RHCS 7 documentation [1]: "Create a dedicated Storage Partition Size for /var/lib/ceph with a minimum size of 120 GB; 240 GB is recommended. If a dedicated partition is not feasible, ensure that /var is on a dedicated partition with at least the above-mentioned free space." - The RHCS 8 + IBM Storage Ceph documentation states "10 GB per mon-container, 50 GB Recommended" [2] which appears quite low and risky to me. - The Upstream doc says "100 GB per daemon, SSD is recommended" [3]. This highlights an inconsistency. I've seen DBs growing up to 60GB during long step recovery on 1000+ OSDs clusters (see [4] for details). So I think 120GB+ is still a good number. Best regards, Frédéric. [1] https://docs.redhat.com/en/documentation/red_hat_ceph_storage/7/html-single/... [2] https://www.ibm.com/docs/en/storage-ceph/8.1.0?topic=hardware-minimum-recomm... [3] https://docs.ceph.com/en/latest/start/hardware-recommendations/ [4] https://docs.ceph.com/en/latest/rados/operations/health-checks/#mon-disk-big -- Frédéric Nass Ceph Ambassador France | Senior Ceph Engineer @ CLYSO Check our online Config Diff Tool, it's great! https://analyzer.clyso.com/#/analyzer/config-diff https://clyso.com | frederic.nass@clyso.com Le sam. 15 nov. 2025 à 22:54, Anthony D'Atri <aad@dreamsnake.net> a écrit :
That's a function of how big the cluster is, and how much churn there is. For production size clusters I would allot at least 50GB, but it sounds like you don't have one. I suspect that OSD and mon RocksDBs will burn an SD card in short order. ymmv. 1.7 GB seems iffy, with all the other stuff that a system might write, including temporary usage during DB compactions.
On Nov 15, 2025, at 4:10 PM, filip Mutterer <filip@3dds.io> wrote:
Hi! 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?
Greetings filip
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