Re: ocfs2+drbd two-primary
On Wed, 2012-12-26 at 23:12 +1100, Igor Cicimov wrote: Maybe try heartbeat if tou are after something simple. Using dual primary though without fencing is asking for trouble, split brain and lost od data. Yes. maybe I will encounter a split brain problem. I had asked the first question for this very reason. I have a similar problem with GlusterFS. But drbd and ocfs2 are block device level software, I think so that won't be problematic as GlusterFS. Also please, could you make reply all? On 26/12/2012 2:35 PM, Atıf CEYLAN meh...@atifceylan.com wrote: You are saying me that use HA and you have a master file system and share from on it via NFS to the other server. is that right? I tried some scenarios about cluster. GlusterFS, NFS and OCFS2. My system daily load is very highly. It's over 50 million transactions daily. So nfs and glusterfs are not great working under the real load. ocfs2 is best solution for me. Because I have many small files and GlusterFS and NFS can not great work with many small files (or many write operations). When ocfs2 use be without drbd, it does go haywire at any fault or crash situation. So I want to try ocfs2+drbd. On Wed, 2012-12-26 at 12:02 +1100, Igor Cicimov wrote: Then you dont need cluster at all do you. Or maybe you dont understand what cluster really means and provides. If you just need apps running on two nodes without any management software then use simple load balancing. Maybe even a NAS providing nfs mount for the mail storage instead of drbd. -- M.Atıf CEYLAN Yurdum Yazılım -- M.Atıf CEYLAN Yurdum Yazılım
Re: ocfs2+drbd two-primary
On Wed, Dec 26, 2012 at 11:47 PM, Atıf CEYLAN meh...@atifceylan.com wrote: ** On Wed, 2012-12-26 at 23:12 +1100, Igor Cicimov wrote: Maybe try heartbeat if tou are after something simple. Using dual primary though without fencing is asking for trouble, split brain and lost od data. Yes. maybe I will encounter a split brain problem. I had asked the first question for this very reason. I have a similar problem with GlusterFS. But drbd and ocfs2 are block device level software, I think so that won't be problematic as GlusterFS. Also please, could you make reply all? I haven't used ocfs2 so I can't comment on it, but from what I could read it handles split brain situations better than gfs2 and doesn't require fencing. The gfs2, as an alternative to ocfs2, apart from fencing requires cman configuration as well. But you say you are not happy with your tests with ocfs2 ... I would say the best place for your question is the Linbit drbd mailing list. I'm sure you'll find more competent answers there from people using various setups in production. At the end of the day there isn't any 100% secure option in the free software world. If you want it, you need to spend some money on hardware appliance like NetApp lets say or Veritas or similar. On 26/12/2012 2:35 PM, Atıf CEYLAN meh...@atifceylan.com wrote: You are saying me that use HA and you have a master file system and share from on it via NFS to the other server. is that right? I tried some scenarios about cluster. GlusterFS, NFS and OCFS2. My system daily load is very highly. It's over 50 million transactions daily. So nfs and glusterfs are not great working under the real load. ocfs2 is best solution for me. Because I have many small files and GlusterFS and NFS can not great work with many small files (or many write operations). When ocfs2 use be without drbd, it does go haywire at any fault or crash situation. So I want to try ocfs2+drbd. On Wed, 2012-12-26 at 12:02 +1100, Igor Cicimov wrote: Then you dont need cluster at all do you. Or maybe you dont understand what cluster really means and provides. If you just need apps running on two nodes without any management software then use simple load balancing. Maybe even a NAS providing nfs mount for the mail storage instead of drbd.
Re: ocfs2+drbd two-primary
Yes I have encountered some issues on ocfs2 but these were not split-brain problems. Also my problems reasons were about the SPOF. So I want to use Drbd. I will join to drbd maillist and ask this subject on there again. Thanks, Igor Cicimov icici...@gmail.com wrote: On Wed, Dec 26, 2012 at 11:47 PM, Atıf CEYLAN meh...@atifceylan.com wrote: ** On Wed, 2012-12-26 at 23:12 +1100, Igor Cicimov wrote: Maybe try heartbeat if tou are after something simple. Using dual primary though without fencing is asking for trouble, split brain and lost od data. Yes. maybe I will encounter a split brain problem. I had asked the first question for this very reason. I have a similar problem with GlusterFS. But drbd and ocfs2 are block device level software, I think so that won't be problematic as GlusterFS. Also please, could you make reply all? I haven't used ocfs2 so I can't comment on it, but from what I could read it handles split brain situations better than gfs2 and doesn't require fencing. The gfs2, as an alternative to ocfs2, apart from fencing requires cman configuration as well. But you say you are not happy with your tests with ocfs2 ... I would say the best place for your question is the Linbit drbd mailing list. I'm sure you'll find more competent answers there from people using various setups in production. At the end of the day there isn't any 100% secure option in the free software world. If you want it, you need to spend some money on hardware appliance like NetApp lets say or Veritas or similar. On 26/12/2012 2:35 PM, Atıf CEYLAN meh...@atifceylan.com wrote: You are saying me that use HA and you have a master file system and share from on it via NFS to the other server. is that right? I tried some scenarios about cluster. GlusterFS, NFS and OCFS2. My system daily load is very highly. It's over 50 million transactions daily. So nfs and glusterfs are not great working under the real load. ocfs2 is best solution for me. Because I have many small files and GlusterFS and NFS can not great work with many small files (or many write operations). When ocfs2 use be without drbd, it does go haywire at any fault or crash situation. So I want to try ocfs2+drbd. On Wed, 2012-12-26 at 12:02 +1100, Igor Cicimov wrote: Then you dont need cluster at all do you. Or maybe you dont understand what cluster really means and provides. If you just need apps running on two nodes without any management software then use simple load balancing. Maybe even a NAS providing nfs mount for the mail storage instead of drbd.
Re: ocfs2+drbd two-primary
Thanks for the answer. if I must do it, I don't want to use the HA (pacemaker or corosync). I should run on both server actively. There is a way for active-active cluster without any HA solution? Do I know incorrect thi? On Wed, 2012-12-26 at 00:43 +1100, Igor Cicimov wrote: Check pacemaker then. Search for cluster from scratch there you can find a comprehensive guide about HA cluster based on pacemaker, corosync, drbd and stonith for fancing. On 25/12/2012 10:47 AM, Atıf CEYLAN meh...@atifceylan.com wrote: Hi all, I have Apache and Postfix+Dovecot are running on two debian servers. I want to use drbd+ocfs2 (or redhat gfs). I tried some configurations and fault scenarios on VM but I have data loss. Would you like suggest me best practice about drbd+cluster filesystem with two-primary mode? regards, -- M.Atıf CEYLAN Yurdum Yazılım -- M.Atıf CEYLAN Yurdum Yazılım
Re: ocfs2+drbd two-primary
You are saying me that use HA and you have a master file system and share from on it via NFS to the other server. is that right? I tried some scenarios about cluster. GlusterFS, NFS and OCFS2. My system daily load is very highly. It's over 50 million transactions daily. So nfs and glusterfs are not great working under the real load. ocfs2 is best solution for me. Because I have many small files and GlusterFS and NFS can not great work with many small files (or many write operations). When ocfs2 use be without drbd, it does go haywire at any fault or crash situation. So I want to try ocfs2+drbd. On Wed, 2012-12-26 at 12:02 +1100, Igor Cicimov wrote: Then you dont need cluster at all do you. Or maybe you dont understand what cluster really means and provides. If you just need apps running on two nodes without any management software then use simple load balancing. Maybe even a NAS providing nfs mount for the mail storage instead of drbd. -- M.Atıf CEYLAN Yurdum Yazılım
ocfs2+drbd two-primary
Hi all, I have Apache and Postfix+Dovecot are running on two debian servers. I want to use drbd+ocfs2 (or redhat gfs). I tried some configurations and fault scenarios on VM but I have data loss. Would you like suggest me best practice about drbd+cluster filesystem with two-primary mode? regards, -- M.Atıf CEYLAN Yurdum Yazılım
