On Mon, Jan 29, 2018 at 8:37 AM, Konstantin Shalygin <k0ste@xxxxxxxx> wrote:
> Anybody know about changes in rbd feature 'striping'? May be is deprecated
> feature? What I mean:
>
> I have volume created by Jewel client on Luminous cluster.
>
> # rbd --user=cinder info
> solid_rbd/volume-12b5df1e-df4c-4574-859d-22a88415aaf7
> rbd image 'volume-12b5df1e-df4c-4574-859d-22a88415aaf7':
> size 200 GB in 51200 objects
> order 22 (4096 kB objects)
> block_name_prefix: rbd_data.73bb33166d45615
> format: 2
> features: layering, striping, exclusive-lock, object-map, fast-diff
> flags:
> create_timestamp: Tue Jan 16 15:06:26 2018
> stripe unit: 4096 kB
> stripe count: 1
>
>
> Striping is enabled.
>
>
> When I was try create volume by Luminous client:
>
>
> # rbd --user=cinder create solid_rbd/mysupervol --size=1G --image-feature
> layering,striping
> # rbd --user=cinder info solid_rbd/mysupervol
> rbd image 'mysupervol':
> size 1024 MB in 256 objects
> order 22 (4096 kB objects)
> block_name_prefix: rbd_data.ae31f32ae8944a
> format: 2
> features: layering
> flags:
> create_timestamp: Mon Jan 29 14:11:10 2018
>
>
> Striping is silently disabled, due lack of stripe_unit and stripe_count
> defaults:
>
>
> # ceph --show-config | grep rbd_default_stripe
> rbd_default_stripe_count = 0
> rbd_default_stripe_unit = 0
Unless you specify a non-default stripe_unit/stripe_count, striping
feature bit is not set and striping-related fields aren't displayed.
This behaviour is new in luminous, but jewel and older clients still
work with luminous images.
>
>
> Try to define manual defaults
>
>
> # rbd --user=cinder create solid_rbd/mysupervol --size=1G --image-feature
> layering,striping --stripe-unit 4096 --stripe-count 1
> # rbd --user=cinder info solid_rbd/mysupervol
> rbd image 'mysupervol':
> size 1024 MB in 256 objects
> order 22 (4096 kB objects)
> block_name_prefix: rbd_data.adebc974b0dc51
> format: 2
> features: layering, striping
> flags:
> create_timestamp: Mon Jan 29 14:16:13 2018
> stripe unit: 4096 bytes
> stripe count: 1
Here you specified a custom stripe_unit, thus enabling the striping
feature bit.
Thanks,
Ilya
_______________________________________________
ceph-users mailing list
ceph-users@xxxxxxxxxxxxxx
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
