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Hi Ceph Users,
Could anyone reply to my below questions? It would be great help. I appreciate.
--Rakesh Parkiti From: ceph-users <ceph-users-bounces@xxxxxxxxxxxxxx> on behalf of Rakesh Parkiti <rakeshparkiti@xxxxxxxxxxx>
Sent: 03 December 2016 13:04 To: ceph-users@xxxxxxxxxxxxxx Subject: RBD Image Features not working on Ubuntu 16.04 + Jewel 10.2.3. Hi All,
I. Firstly, As per my understanding, RBD image features (exclusive-lock, object-map, fast-diff, deep-flatten, journaling) are not yet ready for ceph Jewel version? II. The only working image feature is "Layering". III.Trying to configure rbd-mirroring on two different clusters, which has same "ceph" cluster name. --- Here I have observed two problems: a) Initial command "ceph-deploy --cluster tom new tom1" command is working fine in ubuntu 16.04, where as while creating initial monitor unable to create a monitor. Error: Admin Socket Error.
b) Whereas in CentOS-7, It straight away says:
[user@local1 local]$ ceph-deploy --cluster tom new tom1
[ceph_deploy.conf][DEBUG ] found configuration file at: /home/user/.cephdeploy.conf
[ceph_deploy.cli][INFO ] Invoked (1.5.36): /usr/bin/ceph-deploy --cluster active new local1
:
:
[ceph_deploy.new][ERROR ] custom cluster names are not supported on sysvinit hosts
[ceph_deploy][ERROR ] ClusterNameError: host local1 does not support custom cluster names
Note: This is an expected behavior as per REDHAT Errata forum.
Questions:-
1. To configure RBD-MIRRORING for images. Required RBD image features are "exclusive-lock + journaling" as these two features are mandate.
2. Are RBD image features working with older ceph versions like Hammer?
3. Any Operating System specific Kernel is required to work with these RBD Image features?
4. RBD-Mirroring is production ready? If Yes, can anyone share the working configuration steps?
5. How to change the cluster name from default "ceph" as cluster name?
I did not see any official document with proper steps for cluster name change. only I found this procedure from this below link
http://docs.ceph.com/docs/jewel/rados/deployment/ceph-deploy-new/ , If I am wrong, please direct me to proper
link.
6. Can we configure rbd-mirroring with default "ceph" cluster name for two different clusters? If yes, how to isolate, which is primary and secondary?
--Below is the output, when try to create RBD image with these features (exclusive-lock, object-map, fast-diff, deep-flatten, journaling).
Steps Information: ================
user@tom1:~$ uname -a
Linux tom1 4.4.0-31-generic #50-Ubuntu SMP Wed Jul 13 00:07:12 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
user@tom1:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.04.1 LTS
Release: 16.04
Codename: xenial
user@tom1:~$ ceph -v
ceph version 10.2.3 (ecc23778eb545d8dd55e2e4735b53cc93f92e65b)
user@tom1:~$ ceph -s
cluster c7c91460-3cd6-4183-9ebb-8880fb15865f
health HEALTH_OK
monmap e1: 3 mons at {tom1=10.1.24.93:6789/0,tom2=10.1.24.94:6789/0,tom3=10.1.24.95:6789/0}
election epoch 4, quorum 0,1,2 tom1,tom2,tom3
osdmap e51: 9 osds: 9 up, 9 in
flags sortbitwise
pgmap v255: 128 pgs, 1 pools, 114 bytes data, 5 objects
322 MB used, 134 GB / 134 GB avail
128 active+clean
user@tom1:~$ rados lspools rbd
user@tom1:~$ rbd create --image rbd/img1 --size 1G
user@tom1:~$ rbd --image rbd/img1 info
rbd image 'img1':
size 1024 MB in 256 objects
order 22 (4096 kB objects)
block_name_prefix: rbd_data.105a2ae8944a
format: 2
features: layering, exclusive-lock, object-map, fast-diff, deep-flatten
flags:
user@tom1:~$ rbd feature enable rbd/img1 journaling
user@tom1:~$ rbd --image rbd/img1 info
rbd image 'img1':
size 1024 MB in 256 objects
order 22 (4096 kB objects)
block_name_prefix: rbd_data.105a2ae8944a
format: 2
features: layering, exclusive-lock, object-map, fast-diff, deep-flatten, journaling
flags:
journal: 105a2ae8944a
mirroring state: disabled
user@tom1:~$ sudo rbd map --image rbd/img1
rbd: sysfs write failed
RBD image feature set mismatch. You can disable features unsupported by the kernel with "rbd feature disable".
In some cases useful info is found in syslog - try "dmesg | tail" or so.
rbd: map failed: (6) No such device or address
II. Working with RBD feature - "layering" only
user@tom1:~$ rbd create --image rbd/img2 --size 1G --image-feature layering
user@tom1:~$ rbd --image rbd/img2 info
rbd image 'img2':
size 1024 MB in 256 objects
order 22 (4096 kB objects)
block_name_prefix: rbd_data.105f238e1f29
format: 2
features: layering
flags:
user@tom1:~$ sudo rbd map --image rbd/img2
/dev/rbd0
user@tom1:~$ rbd showmapped
id pool image snap device
0 rbd img2 - /dev/rbd0
can someone help in replying these questions. It would be great help. Thanks..!
Thanks
Rakesh Parkiti
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