On 12/12/18 4:44 PM, Vikas Rana wrote:
> Hi,
>
> We are using Luminous and copying a 100TB RBD image to DR site using RBD
> Mirror.
>
> Everything seems to works fine.
>
> The question is, can we mount the DR copy as Read-Only? We can do it on
> Netapp and we are trying to figure out if somehow we can mount it RO on
> DR site, then we can do backups at DR site.
>
> When i tried it mount it via, RBD-NBD, it complains about super-block.
> When I promoted the DR copy, the same image works fine. So data is there
> but cant be mounted.
>
What filesystem is being used here? EXT4?
Try mounting it with:
$ mount ro,noload /dev/XXXX /tmp/myrbd
Otherwise the FS will try to load the journal and that fails.
Wido
> We also tried taking snap but it complains that it can't take snap of a
> Read-only copy.
>
> Any suggestion or pointer will be greatly appreciated.
>
> Thanks,
> -Vikas
>
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