Yes, technically the pool could be used for multiple things, but that is not a common practice and I don't think it is a scenario tested by the dev team with each release. I would about it unless you have a very compelling argument to do something so differently.
On Tue, Jul 25, 2017, 6:13 AM <c.monty@xxxxxx> wrote:
Understood.
Would you recommend to have a dedicated pool for the data that is directly written using librados and another pool for the filesystem (CephFS)?
24. Juli 2017 19:46, "David Turner" <drakonstein@xxxxxxxxx> schrieb:
You might be able to read these objects using s3fs if you're using a RadosGW. But like John mentioned, you cannot write them as objects into the pool and read them as files from the filesystem.
On Mon, Jul 24, 2017, 12:07 PM John Spray <jspray@xxxxxxxxxx> wrote:On Mon, Jul 24, 2017 at 4:52 PM, <c.monty@xxxxxx> wrote:
> Hello!
>
> I created CephFS according to documentation:
> $ ceph osd pool create hdb-backup <pg_num>
> $ ceph osd pool create hdb-backup_metadata <pg_num>
> $ ceph fs new <fs_name> <metadata> <data>
>
> I can mount this pool with user admin:
> ld4257:/etc/ceph # mount -t ceph 10.96.5.37,10.96.5.38,10.96.5.38:/ /mnt/cephfs -o name=admin,secretfile=/etc/ceph/ceph.client.admin.key
Need to untangle the terminology a bit.
What you're mounting is a filesystem, the filesystem is storing it's
data in pools. Pools are a lower-level concept than filesystems.
> ld4257:/etc/ceph # mount | grep ceph
> 10.96.5.37,10.96.5.38,10.96.5.38:/ on /mnt/cephfs type ceph (rw,relatime,name=admin,secret=<hidden>,acl)
>
> To verify which pool is mounted, I checked this:
> ld4257:/etc/ceph # ceph osd lspools
> 0 rbd,1 templates,3 hdb-backup,4 hdb-backup_metadata,
>
> ld4257:/etc/ceph # cephfs /mnt/cephfs/ show_layout
> WARNING: This tool is deprecated. Use the layout.* xattrs to query and modify layouts.
> layout.data_pool: 3
> layout.object_size: 4194304
> layout.stripe_unit: 4194304
> layout.stripe_count: 1
>
> So, I guess the correct pool "hdb-backup" is now mounted to /mnt/cephfs.
>
> Then I pushed some files in this pool.
I think you mean that you put some objects into your pool. So at this
stage you have not created any files, cephfs doesn't know anything
about these objects. You would need to really create files (i.e.
write to your mount) to have files that exist in cephfs.
> I can display the relevant objects now:
> ld4257:/etc/ceph # rados -p hdb-backup ls
> MTY:file:8669fdbb88fda698afbac6374d826cba133a8d11:7269
> MTY:file:8669fdbb88fda698afbac6374d826cba133a8d11:6357
> MTY:file:8669fdbb88fda698afbac6374d826cba133a8d11:772
> MTY:file:8669fdbb88fda698afbac6374d826cba133a8d11:14039
> MTY:file:8669fdbb88fda698afbac6374d826cba133a8d11:1803
> MTY:file:8669fdbb88fda698afbac6374d826cba133a8d11:5549
> MTY:file:8669fdbb88fda698afbac6374d826cba133a8d11:15797
> MTY:file:8669fdbb88fda698afbac6374d826cba133a8d11:20624
> MTY:file:8669fdbb88fda698afbac6374d826cba133a8d11:7322
> MTY:file:8669fdbb88fda698afbac6374d826cba133a8d11:5208
> MTY:file:8669fdbb88fda698afbac6374d826cba133a8d11:17479
> MTY:file:8669fdbb88fda698afbac6374d826cba133a8d11:14361
> MTY:file:8669fdbb88fda698afbac6374d826cba133a8d11:16963
> MTY:file:8669fdbb88fda698afbac6374d826cba133a8d11:4694
> MTY:file:8669fdbb88fda698afbac6374d826cba133a8d11:1391
> MTY:file:8669fdbb88fda698afbac6374d826cba133a8d11:1199
> MTY:file:8669fdbb88fda698afbac6374d826cba133a8d11:11359
> MTY:file:8669fdbb88fda698afbac6374d826cba133a8d11:11995
> [...]
>
> (This is just an extract, there are many more object.)
>
> Now, the question is:
> Can I display these files with CephFS?
Unfortunately not -- you would need to write your data in as files
(via a cephfs mount) to read it back as files.
John
>
> When I check the content of /mnt/cephfs, there's only one directory "MTY" that I have created; this directory is not related to the output of rados at all:
> ld4257:/etc/ceph # ll /mnt/cephfs/
> total 0
> drwxr-xr-x 1 root root 0 Jul 24 15:57 MTY
>
> THX
> _______________________________________________
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> ceph-users@xxxxxxxxxxxxxx
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