ceph subvolume snapshot

[cola16]

I am using cephfs.
I am also using snap-schedule.

This time I am trying to use subvolume for erasure code.

But I don't see any scheduled snapshots
I tried creating cephfs with erasure code as the default pool and the snapshot works fine.

Probably snapshot is not possible on subvolume.
I want to know how to use snapshot for subvolume.

 

[gurubert]

CephFS subvolumes are usually only used within Kubernetes. What is your usecase?

 

[cola16]

CephFS subvolumes are usually only used within Kubernetes. What is your usecase?

for erasure code.
In this documents, https://docs.ceph.com/en/latest/cephfs/createfs/?highlight=fuse+support, 'To set an erasure-coded pool for the default data pool. Use of an EC pool for the default data pool is discouraged. '

I don't need performance at all, and I need a lot of capacity like video data.
I want to use erasure code for that purpose.

According to the link, there seems to be only performance issues related to inodes when I use default pool as erasure-code.
If snapshotting to a subvolume is officially not supported, I would make the erasure code pool the default pool.

 

[gurubert]

You do not need a subvolume to add another data pool to an filesystem:

https://docs.ceph.com/en/latest/cephfs/file-layouts/#adding-data-pool-to-file-system

 

[cola16]

You do not need a subvolume to add another data pool to an filesystem:

https://docs.ceph.com/en/latest/cephfs/file-layouts/#adding-data-pool-to-file-system

thank you!
I'll try!

 

[cola16]

snapshot works!
Writing data increases the usage of the erasure code pool!

Thank you very much!