Re: ceph same rbd on multiple client

[Henrik Korkuc <lists@xxxxxxxxx>]

can you paste dmesg and system logs? I am using 3 node OCFS2 with RBD and had no problems.

On 15-10-23 08:40, gjprabu wrote:

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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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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