I have a Ceph instance I'm wherein I'm trying to use erasure coding with
RBD (and libvirt). I've followed
https://docs.ceph.com/en/latest/rados/operations/erasure-code/#erasure-coding-with-overwrites
and enabled overwrites so that RBD can be used. In doing so, I've set
the data_pool to the erasure coded pool, with set to the replicated
pool.
I have the following in ceph.conf:
rbd_default_data_pool = libvirt-pool-ec
Here's an rbd info on the image I've created (notice the "data_pool"
config):
rbd image 'xxxxxxx':
size 500 GiB in 128000 objects
order 22 (4 MiB objects)
snapshot_count: 0
id: 7e37e442592b
data_pool: libvirt-pool-ec
block_name_prefix: rbd_data.6.7e37e442592b
format: 2
features: layering, exclusive-lock, object-map, fast-diff,
deep-flatten, data-pool
op_features:
flags:
create_timestamp: Fri Sep 13 16:34:06 2024
access_timestamp: Fri Sep 13 16:34:06 2024
modify_timestamp: Fri Sep 13 16:34:06 2024
The problem, when I attach this rbd image to a VM, I cannot write to it
at all, I get an I/O error. But, when I create and rbd image without the
"rbd_default_data_pool = libvirt-pool-ec" setting, I can write fine.
Wanted to see if anyone has any ideas, maybe I'm missing something
simple. Thanks in advance!
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