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Ceph

Documentation

Section titled “Documentation”

https://pve.proxmox.com/pve-docs/chapter-pveceph.html
https://docs.ceph.com/en/latest/

Reference

Section titled “Reference”

List placement groups by pool

Section titled “List placement groups by pool”
ceph pg ls-by-pool <pool>

CRUSH MSR (multi-step retry) rule

Section titled “CRUSH MSR (multi-step retry) rule”

https://docs.ceph.com/en/latest/dev/crush-msr/

rule msr_rule {
    id <#>
    type msr_firstn
    step take default
    step choosemsr <#> type host
    step choosemsr <#> type osd
    step emit
}

Manually edit CRUSH map

Section titled “Manually edit CRUSH map”

https://docs.ceph.com/en/latest/rados/operations/crush-map-edits/

Dump

Section titled “Dump”
ceph osd getcrushmap -o crush.map

Decompile

Section titled “Decompile”
crushtool -d crush.map -o crush.dmap

Edit

Section titled “Edit”
nano crush.dmap

Compile

Section titled “Compile”
crushtool -c crush.dmap -o crush.map

Import

Section titled “Import”
ceph osd setcrushmap -i crush.map