I have a use case where I want to only use a small portion of the disk for
the OSD and the documentation states that I can use
data_allocation_fraction [1]
But cephadm can not use this and throws this error:
/usr/bin/podman: stderr ceph-volume lvm batch: error: unrecognized
arguments: --data-allocate-fraction 0.1
So, what I actually want to achieve:
Split up a single SSD into:
3-5x block.db for spinning disks (5x 320GB or 3x 500GB regarding if I have
8TB HDDs or 16TB HDDs)
1x SSD OSD (100G) for RGW index / meta pools
1x SSD OSD (100G) for RGW gc pool because of this bug [2]
My service definition looks like this:
service_type: osd
service_id: hdd-8tb
placement:
host_pattern: '*'
crush_device_class: hdd
spec:
data_devices:
rotational: 1
size: ':9T'
db_devices:
rotational: 0
limit: 5
size: '1T:2T'
encrypted: true
block_db_size: 320000000000
---
service_type: osd
service_id: hdd-16tb
placement:
host_pattern: '*'
crush_device_class: hdd
spec:
data_devices:
rotational: 1
size: '14T:'
db_devices:
rotational: 0
limit: 1
size: '1T:2T'
encrypted: true
block_db_size: 500000000000
---
service_type: osd
service_id: gc
placement:
host_pattern: '*'
crush_device_class: gc
spec:
data_devices:
rotational: 0
size: '1T:2T'
encrypted: true
data_allocate_fraction: 0.05
---
service_type: osd
service_id: ssd
placement:
host_pattern: '*'
crush_device_class: ssd
spec:
data_devices:
rotational: 0
size: '1T:2T'
encrypted: true
data_allocate_fraction: 0.05
[1]
https://docs.ceph.com/en/pacific/cephadm/services/osd/#ceph.deployment.drive_group.DriveGroupSpec.data_allocate_fraction
[2] https://tracker.ceph.com/issues/53585
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