On 11/8/18 1:05 PM, ST Wong (ITSC) wrote:
> Hi,
>
>
>
> We created a testing rbd block device image as following:
>
>
>
> ----- cut here -------
>
> # rbd create 4copy/foo --size 10G
>
> # rbd feature disable 4copy/foo object-map fast-diff deep-flatten
>
> # rbd --image 4copy/foo info
>
> rbd image 'foo':
>
> size 10 GiB in 2560 objects
>
> order 22 (4 MiB objects)
>
> id: 122f36b8b4567
>
> block_name_prefix: rbd_data.122f36b8b4567
>
> format: 2
>
> features: layering, exclusive-lock
>
> op_features:
>
> flags:
>
> create_timestamp: Thu Nov 8 19:42:25 2018
>
>
>
> ----- cut here -------
>
>
>
> Then try to mount it on client but got error and can’t be mounted:
>
>
>
> ----- cut here -------
>
> # mount /dev/rbd0 /mnt
>
> mount: /dev/rbd0 is write-protected, mounting read-only
>
> mount: unknown filesystem type '(null)'
Did you create a filesystem on it with mkfs? Are you sure there is a
FileSystem on it?
Wido
>
> ----- cut here -------
>
>
>
> Did we do any step incorrect? We’re using mimic. Thanks.
>
>
>
>
>
>
>
> Besides, the rbd client is deployed through ceph-ansible as client role
> and found that the ceph.client.admin.keyring from admin server was also
> copied to the client machine. Is it necessary? Thanks a lot.
>
>
>
> Best Regards,
>
> /ST Wong
>
>
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>
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