Hi All,
OK, an update for everyone, a note about some (what I believe to be)
missing information in the Ceph Doco, a success story, and an admission
on my part that I may have left out some important information.
So to start with, I finally got everything working - I now have my 4T
RBD Image mapped, mounted, and tested on my host. YAAAAA!
The missing Ceph Doco Info:
What I found in the latested Redhat documentation
(https://access.redhat.com/documentation/en-us/red_hat_ceph_storage/7/html/block_device_guide/the-rbd-kernel-module)
that is not in the Ceph documentation (perhaps because it is
EL-specific? - but a note should be placed anyway, even if it is
EL-specific) is that the RBD Image needs to have a partition entry
created for it - that might be "obvious" to some, but my ongoing belief
is that most "obvious" things aren't, so its better to be explicit about
such things. Just my $0.02 worth. :-)
The relevant commands, which are performed after a `rbd map
my_pool.meta/my_image --id my_image_user` are:
[codeblock]
parted /dev/rbd0 mklabel gpt
parted /dev/rbd0 mkpart primary xfs 0% 100%
[/codebock]
From there the RBD Image needs a file system: `mkfs.xfs /dev/rbd0p1`
And a mount: `mount /dev/rbd0p1 /mnt/my_image`
Now, the omission on my part:
The host I was attempting all this on was an oVirt-managed VM.
Apparently, an oVirt-Managed VM doesn't like/allow (speculation on my
part) running the `parted` or `mkfs.xfs` commands on an RBD Image. What
I had to do to test this and get it working was to run the `rbd map`,
`parted`, and `mkfs.xfs` commands on a physical host (which I did), THEN
unmount/unmap the image from the physical host and map / mount it on the VM.
So my apologises for not providing all the info - I didn't consider it
to be relevant - my bad!
So all good in the end. I hope the above helps others if they have
similar issues.
Thank you all who helped / pitched in with ideas - I really, *really*
appreciate it.
Thanks too to Wesley Dillingham - although the suggestion wasn't
relevant to this issue, it did cause me to look at the firewall settings
on the Ceph Cluster where I found (and corrected) an unrelated issue
that hadn't reared its ugly head yet. Thanks Wes.
Cheers (until next time) :-P
Dulux-Oz
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