Hi Somnath,We are using RBD, please find linux and rbd versions. I agree this is related to client side issue. My though gone to backup because weekly once will take full backup not incremental at the time we found issue once but not sure.Linux versionCentOS Linux release 7.1.1503 (Core)Kernel : - 3.10.91rbd --versionceph version 0.94.5 (9764da52395923e0b32908d83a9f7304401fee43)rbd showmappedid pool image snap device1 rbd downloads - /dev/rbd1rbd lsdownloadsClient server RBD mounted using ocfs2 file system./dev/rbd1 ocfs2 9.6T 2.6T 7.0T 27% /data/downloadsClient level cluster configuration done with 5 clients and We are using below procedure in client node.1) rbd map downloads --pool rbd --name client.admin -m 192.168.112.192,192.168.112.193,192.168.112.194 -k /etc/ceph/ceph.client.admin.keyring2) Formatting rbd with ocfs2mkfs.ocfs2 -b4K -C 4K -L label -T mail -N5 /dev/rbd/rbd/downloads3) We have do ocfs2 client level configuration and start ocfs2 service.4) mount /dev/rbd/rbd/downloads /data/downloadsPlease let me know do you need any other information.RegardsPrabu_______________________________________________ceph-users mailing listPrabu,
I assume you are using krbd then..Could you please let us know the Linux version/flavor you are using ?
Krbd had some hang issues and supposed to be fixed with the latest versions available..Also, it could be due to OCFS2->krbd integration as well (?) ..Handling data consistency is the responsibility of OCFS as krbd doesn’t guarantee that..So, I would suggest to do the following to root cause if your cluster is not into production.
1. Do a synthetic fio run on krbd alone (or creating a filesystem on top) and see if you can reproduce the hang
2. Try building the latest krbd or upgrade your Linux version to get a newer krbd and see if it is still happening.
<< Also we are taking backup from client, we feel that could be the reason for this hang
I assume this is regular filesystem back up ? Why do you think this could be a problem ?
I think it is a client side issue , I doubt it could be because of large OSD size..
Thanks & Regards
Somnath
From: gjprabu [mailto:gjprabu@xxxxxxxxxxxx]
Sent: Wednesday, December 30, 2015 4:29 AM
To: gjprabu
Cc: Somnath Roy; ceph-users; Siva Sokkumuthu
Subject: Re: OSD size and performance
Hi Somnath,
Thanks for your reply. Current setup we are having client hang issue and its hang frequently and after reboot it is working, Client used to mount with OCFS2 file system for multiple concurrent client access for same data. Also we are taking backup from client, we feel that could be the reason for this hang.
Regards
Prabu
---- On Wed, 30 Dec 2015 11:33:20 +0530 Somnath Roy <Somnath.Roy@xxxxxxxxxxx>wrote ----
FYI , we are using 8TB SSD drive as OSD and not seeing any problem so far. Failure domain could be a concern for bigger OSDs.
Thanks & Regards
Somnath
From: ceph-users [mailto:ceph-users-bounces@xxxxxxxxxxxxxx] On Behalf Of gjprabu
Sent: Tuesday, December 29, 2015 9:38 PM
To: ceph-users
Cc: Siva Sokkumuthu
Subject: Re: [ceph-users] OSD size and performance
Hi Team,
Anybody please clarify the below queries.
Regards
Prabu
---- On Tue, 29 Dec 2015 13:03:45 +0530 gjprabu <gjprabu@xxxxxxxxxxxx>wrote ----
Hi Team,
We are using ceph with 3 osd and 2 replicas. Each osd size is 13TB and current data is reached to 2.5TB (each osd). Because of this huge size do we face any problem.
OSD server configuration
Hard disk -- 13TB
RAM -- 96GB
CPU -- 2 CPU with multi 8 core processor.
Regards
Prabu
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