10 Dec
2019
10 Dec
'19
2 p.m.
On 12/10/19 8:10 AM, Gerdriaan Mulder wrote:
Hi Matt,
On 12/10/19 1:52 PM, Matt Benjamin wrote:
git-tree.png is the 'head' object, which stores the object's attributes
(including storage class). Head objects always go in the default storage
class of the bucket's placement target, because we have to be able to
find them without knowing their storage class. The actual object data
gets striped over 'tail' objects, which have funky names with _shadow_
in them, and it's these objects that you see placed correctly in the
tier2-hdd pool.
I think actually moving an already-stored object
requires a lifecycle
transition policy. Assuming such a policy exists and matches the
object by prefix/tag/time, it would migrate during an (hopefully the
first) eligible lc processing window.
That would probably be an acceptable alternative. I did have such a
policy in place to automatically change the storage class (and I
verified this works from the perspective of s3cmd). But when I looked
at `rados -p tier1-ssd ls`, the object that I presumed was moved was
still there.
Another example I just executed: directly setting the storage class
gives me the following output:
<<<<<<<
client $ s3cmd put git-tree.png s3://bucket/
--storage-class=SPINNING_RUST
WARNING: Module python-magic is not available. Guessing MIME types
based on file extensions.
upload: 'git-tree.png' -> 's3://bucket/git-tree.png' [1 of 1]
16490 of 16490 100% in 0s 532.37 kB/s done
client $ s3cmd info s3://bucket/git-tree.png
Last mod: Tue, 10 Dec 2019 12:58:52 GMT
Storage: SPINNING_RUST
=======
On the cluster:
<<<<<<<
root@node1:~# rados -p tier2-hdd ls
ce2fc9ee-edc8-4dc7-a3fe-b1458c67168b.5805.1__shadow_.aQHkk2RcTCHN64E_XJjA0wGTnUtWSN2_0
ce2fc9ee-edc8-4dc7-a3fe-b1458c67168b.5805.1__shadow_.FEruUOZaVJXJcOG-e2tO1xcInNzoEvN_0
root@node1:~# rados -p tier1-ssd ls
ce2fc9ee-edc8-4dc7-a3fe-b1458c67168b.5805.1_git-tree.png
ce2fc9ee-edc8-4dc7-a3fe-b1458c67168b.5805.1_darthvader.png
ce2fc9ee-edc8-4dc7-a3fe-b1458c67168b.5805.1_2019-10-15-090436_1254x522_scrubbed.png
ce2fc9ee-edc8-4dc7-a3fe-b1458c67168b.5805.1_kanariepiet.jpg
=======
whereas I would expect "git-tree.png" to only reside in the pool
tier2-hdd. This gives me the suggestion that I made an error in
configuring the storage_class->pool association.
My hunch is that the zone(group) placement is incorrect, but I can't
really find clear documentation on that subject.
Any thoughts on that?
Best regards,
Gerdriaan Mulder
On Tue, Dec 10, 2019 at 7:44 AM Gerdriaan Mulder
<gerdriaan(a)hexon.nl>
wrote:
_______________________________________________
ceph-users mailing list -- ceph-users(a)ceph.io
To unsubscribe send an email to ceph-users-leave(a)ceph.io
Hi,
If I change the storage class of an object via s3cmd, the object's
storage class is reported as being changed. However, when inspecting
where the objects are placed (via `rados -p <pool> ls`, see further
on),
the object seems to be retained in the original pool.
The idea behind this test setup is to simulate two storage locations,
one based on SSDs or similar flash storage, the other on slow HDDs. We
want to be able to alter the storage location of objects on the fly,
typically only from fast to slow storage. The object should then only
reside on slow storage.
The setup is as follows on Nautilus (Ubuntu 16.04, see
<https://gist.github.com/mrngm/bba6ffdc545bfa52ebf79d6d2c002a6d> for
the
full dump):
<<<<<<<<
root@node1:~# ceph -s
health: HEALTH_OK
mon: 3 daemons, quorum node1,node3,node5 (age 12d)
mgr: node2(active, since 6d), standbys: node4
osd: 4 osds: 4 up (since 12d), 4 in (since 12d)
rgw: 1 daemon active (node1)
pools: 7 pools, 296 pgs
objects: 229 objects, 192 KiB
usage: 3.2 GiB used, 6.8 GiB / 10 GiB avail
pgs: 296 active+clean
root@node1:~# ceph osd tree
ID CLASS WEIGHT TYPE NAME STATUS REWEIGHT PRI-AFF
-1 0.00970 root default
-16 0.00970 datacenter nijmegen
-3 0.00388 host node2
0 hdd 0.00388 osd.0 up 1.00000 1.00000
-5 0.00388 host node3
1 hdd 0.00388 osd.1 up 1.00000 1.00000
-7 0.00098 host node4
2 ssd 0.00098 osd.2 up 1.00000 1.00000
-9 0.00098 host node5
3 ssd 0.00098 osd.3 up 1.00000 1.00000
root@node1:~# ceph osd pool ls detail
pool 1 'tier1-ssd' replicated size 2 min_size 1 crush_rule 1
object_hash
rjenkins pg_num 128 pgp_num 128 [snip] application rgw
pool 2 'tier2-hdd' replicated size 1 min_size 1 crush_rule 2
object_hash
rjenkins pg_num 128 pgp_num 128 [snip] application rgw
pool 3 '.rgw.root' replicated size 2 min_size 1 crush_rule 0
object_hash
rjenkins pg_num 8 pgp_num 8 [snip] application rgw
pool 4 'default.rgw.control' replicated size 2 min_size 1 crush_rule 0
[snip] application rgw
pool 5 'default.rgw.meta' replicated size 2 min_size 1 crush_rule 0
[snip] application rgw
pool 6 'default.rgw.log' replicated size 2 min_size 1 crush_rule 0
[snip] application rgw
pool 7 'default.rgw.buckets.index' replicated size 3 min_size 2
crush_rule 0 [snip] application rgw
root@node1:~# ceph osd pool application get # compacted
tier1-ssd => rgw {}
tier2-hdd => rgw {}
.rgw.root => rgw {}
default.rgw.control => rgw {}
default.rgw.meta => rgw {}
default.rgw.log => rgw {}
default.rgw.buckets.index => rgw {}
root@node1:~# radosgw-admin zonegroup placement list
[
{
"key": "default-placement",
"val": {
"name": "default-placement",
"tags": [],
"storage_classes": [
"SPINNING_RUST",
"STANDARD"
]
}
}
]
root@node1:~# radosgw-admin zone placement list
[
{
"key": "default-placement",
"val": {
"index_pool": "default.rgw.buckets.index",
"storage_classes": {
"SPINNING_RUST": {
"data_pool": "tier2-hdd"
},
"STANDARD": {
"data_pool": "tier1-ssd"
}
},
"data_extra_pool": "default.rgw.buckets.non-ec",
"index_type": 0
}
}
]
========
I can also post the relevant s3cmd commands for putting objects and
setting the storage class, but perhaps this is already enough
information. Please let me know.
<<<<<<<<
root@node1:~# rados -p tier1-ssd ls
ce2fc9ee-edc8-4dc7-a3fe-b1458c67168b.5805.1_darthvader.png
ce2fc9ee-edc8-4dc7-a3fe-b1458c67168b.5805.1_2019-10-15-090436_1254x522_scrubbed.png
ce2fc9ee-edc8-4dc7-a3fe-b1458c67168b.5805.1_kanariepiet.jpg
root@node1:~# rados -p tier2-hdd ls
ce2fc9ee-edc8-4dc7-a3fe-b1458c67168b.5805.1__shadow_.FEruUOZaVJXJcOG-e2tO1xcInNzoEvN_0
$ s3cmd info s3://bucket/kanariepiet.jpg
[snip]
Last mod: Tue, 10 Dec 2019 08:09:58 GMT
Storage: STANDARD
[snip]
$ s3cmd info s3://bucket/darthvader.png
[snip]
Last mod: Wed, 04 Dec 2019 10:35:14 GMT
Storage: SPINNING_RUST
[snip]
$ s3cmd info s3://bucket/2019-10-15-090436_1254x522_scrubbed.png
[snip]
Last mod: Tue, 10 Dec 2019 10:33:24 GMT
Storage: STANDARD
[snip]
==========
Any thoughts on what might occur here?
Best regards,
Gerdriaan Mulder
_______________________________________________
ceph-users mailing list -- ceph-users(a)ceph.io
To unsubscribe send an email to ceph-users-leave(a)ceph.io