Re: ceph same rbd on multiple client

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Hi Frederic,
 
           Can you give me some solution, we are spending more time to solve this issue.
        
Regards
Prabu




---- On Thu, 15 Oct 2015 17:14:13 +0530 Tyler Bishop <tyler.bishop@xxxxxxxxxxxxxxxxx> wrote ----

I don't know enough on ocfs to help.  Sounds like you have unconccurent writes though

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On Oct 15, 2015, at 1:53 AM, gjprabu <gjprabu@xxxxxxxxxxxx> wrote:
Hi Tyler,

   Can please send me the next setup action to be taken on this issue.

Regards
Prabu


---- On Wed, 14 Oct 2015 13:43:29 +0530 gjprabu <gjprabu@xxxxxxxxxxxx> wrote ----

Hi Tyler,

         Thanks for your reply. We have disabled rbd_cache but still issue is persist. Please find our configuration file.

# cat /etc/ceph/ceph.conf
[global]
fsid = 944fa0af-b7be-45a9-93ff-b9907cfaee3f
mon_initial_members = integ-hm5, integ-hm6, integ-hm7
mon_host = 192.168.112.192,192.168.112.193,192.168.112.194
auth_cluster_required = cephx
auth_service_required = cephx
auth_client_required = cephx
filestore_xattr_use_omap = true
osd_pool_default_size = 2

[mon]
mon_clock_drift_allowed = .500

[client]
rbd_cache = false

--------------------------------------------------------------------------------------

 cluster 944fa0af-b7be-45a9-93ff-b9907cfaee3f
     health HEALTH_OK
     monmap e2: 3 mons at {integ-hm5=192.168.112.192:6789/0,integ-hm6=192.168.112.193:6789/0,integ-hm7=192.168.112.194:6789/0}
            election epoch 480, quorum 0,1,2 integ-hm5,integ-hm6,integ-hm7
     osdmap e49780: 2 osds: 2 up, 2 in
      pgmap v2256565: 190 pgs, 2 pools, 1364 GB data, 410 kobjects
            2559 GB used, 21106 GB / 24921 GB avail
                 190 active+clean
  client io 373 kB/s rd, 13910 B/s wr, 103 op/s


Regards
Prabu

---- On Tue, 13 Oct 2015 19:59:38 +0530 Tyler Bishop <tyler.bishop@xxxxxxxxxxxxxxxxx> wrote ----

You need to disable RBD caching.



Tyler Bishop
Chief Technical Officer
513-299-7108 x10

Tyler.Bishop@xxxxxxxxxxxxxxxxx

If you are not the intended recipient of this transmission you are notified that disclosing, copying, distributing or taking any action in reliance on the contents of this information is strictly prohibited.





From: "gjprabu" <gjprabu@xxxxxxxxxxxx>
To: "Frédéric Nass" <frederic.nass@xxxxxxxxxxxxxxxx>
Cc: "<ceph-users@xxxxxxxxxxxxxx>" <ceph-users@xxxxxxxxxxxxxx>, "Siva Sokkumuthu" <sivakumar@xxxxxxxxxxxx>, "Kamal Kannan Subramani(kamalakannan)" <kamal@xxxxxxxxxxxxxxxx>
Sent: Tuesday, October 13, 2015 9:11:30 AM
Subject: Re: ceph same rbd on multiple client

Hi ,

 We have CEPH  RBD with OCFS2 mounted servers. we are facing i/o errors simultaneously while move the folder using one nodes in the same disk other nodes data replicating with below said error (Copying is not having any problem). Workaround if we remount the partition this issue get resolved but after sometime problem again reoccurred. please help on this issue.

Note : We have total 5 Nodes, here two nodes working fine other nodes are showing like below input/output error on moved data's.

ls -althr 
ls: cannot access LITE_3_0_M4_1_TEST: Input/output error 
ls: cannot access LITE_3_0_M4_1_OLD: Input/output error 
total 0 
d????????? ? ? ? ? ? LITE_3_0_M4_1_TEST 
d????????? ? ? ? ? ? LITE_3_0_M4_1_OLD 

Regards
Prabu


---- On Fri, 22 May 2015 17:33:04 +0530 Frédéric Nass <frederic.nass@xxxxxxxxxxxxxxxx> wrote ----

Hi,

Waiting for CephFS, you can use clustered filesystem like OCFS2 or GFS2 on top of RBD mappings so that each host can access the same device and clustered filesystem.

Regards,

Frédéric.

Le 21/05/2015 16:10, gjprabu a écrit :


-- 
Frédéric Nass

Sous direction des Infrastructures,
Direction du Numérique,
Université de Lorraine.

Tél : 03.83.68.53.83
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ceph-users mailing list
Hi All,

        We are using rbd and map the same rbd image to the rbd device on two different client but i can't see the data until i umount and mount -a partition. Kindly share the solution for this issue.

Example
create rbd image named foo
map foo to /dev/rbd0 on server A,   mount /dev/rbd0 to /mnt
map foo to /dev/rbd0 on server B,   mount /dev/rbd0 to /mnt

Regards
Prabu



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