DRBD is a Distributed Replicated Block Device. Developed by LinBit it is now part of the standard-linux-kernel. Regard it as RAID 1 across an IP-network using any type of block device. Normally only the "primary" side can write.
Questions tagged [drbd]
283 questions
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Will (Effectively) Nested Xen SR be Stable?
Is an effectively nested Xen Server storage repository a problem for stability?
Consider the graphic for the data path of the web server to a physical drive: (Starting on the right)
In the graphic Xen Server and the VM DRBD/NFS server is hosted on…
Damon
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I/O usage high on drdb drives
The I/O usage is high on drives of drdb, but the usage is very low on the underlying drive. Is it right to ignore usage of I/O on DRDB drive as the underlying disk usage is fine.
We have 4 Redhat Boxes Dell PowerEdge R630 (say a,b,c,d) having the…
Manu
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Folder / Storage mirroring
I have a web application running on a single VPS now and I want to scale it and make it HA using two VPS (from different providers) that works together using a load balancer.
I've successfully put MySQL Master-Master Replication and I was able to…
Akram
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DRBD /dev/drbd0 not showing : mysql stopped
I have two Xen virtual servers with mysql cluster(db1 and db2) with DRBD and corosync.
Recently one of the server i upgrade to KVM and i configured drbd *.res file to be sync again and its working. But the issue is the mysql mounted partition is…
Riad
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Puppet: DRBD Resource not promoting in Corosync/Pacemaker
I'm trying to recreate a complete cluster setup from blank using puppet. Everything up to this point works, but now the cluster doesn't promote the DRBD resource on either node.
This is the working cluster configuration that I'm trying to…
Christoph Gösgens
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Postgres server not starting on drbd + pacemaker
I am trying to bring up the postgres server over ubuntu 14.04 with drbd and fiesystem.
Service state as below:
Last updated: Mon Mar 14 01:16:45 2016
Last change: Mon Mar 14 01:05:53 2016 via cibadmin on node1
Stack: corosync
Current DC: node2 (2) -…
tollboy
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Adding network-fault tolerance to drbd or drbd alternatives
I've been working with drbd for about a year now, and at this point I'm tearing my hair out in frustration. Every time there is a network fault (something that is disappointingly common in the environment I'm working in) a critical pair of servers…
Oblivious12
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Mirroring VGs between two Linux server
I have two nodes , each has 20 HDDs (identical size) .
Both nodes are configured with 2 VGs , each VG was created using 10 disks . 1 VG is called SAN the 2nd is called NAS .
Node1- will provide nfs services and the nfs data will be kept on the NAS…
John Doe
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DRBD what is the meaning of warning "nothing to do in stacked mode"
We just installed DRBD on one node (the second one is not installed).
After doing
drbdadm primary theres
service drbd start
everything is ok (resource available) but the following warning message appears
WARN: nothing stacked for this host…
Déjà vu
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What problems arise if user-space drbd is older than the kernel module?
Since more than five years I am using XEN in a productive environment.
My constellation: SLES11 (included: OpenSource XEN 4.x), DRBD 8.3 in primary/secondary mode.
Now I would have loved to go away from SLES to RedHat or CentOS, but sadly there was…
Nils
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Clone a VirtualBox VDI to make a second DRBD node
A primary node has been built up in a VirtualBox (guest RHEL 6 + DRBD).
In order to get a second node with the same configuration, a VirtualBox cloning operation seems ideal
easiness
declare the second node DRBD secondary: drbdadm secondary…
Déjà vu
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DRBD/Corosync mysql clutser
I have configured HA cluster on two nodes host1 and host2. host1 is master and host2 is slave.
If I shutdown host1 then host2 never comes up as master until I restart openais service. Some time I have to restart several times.
If I start Host1…
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DRBD Dual-Primary Obstacles
I have DRBD installed and configured on two different servers, everything is working as expected but I am having a horrible I/O disk read/write speed and network latency like crazy, my shared partition is 35 GB and it takes me days to fully sync…
user204252
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CentOs 6.5 GFS2 DRBD SAMBA CTDB : g_lock_force_unlock: Could not store record: NT_STATUS_UNSUCCESSFUL
My SAMBA cluster is unreliable, I noticed that from Windows desktop (on some occasion works fine but it is not reliable), on Ubuntu I'm getting this error (same is keep repeating in the log):
[root@smb1 ~]# smbpasswd -a root
lib/dbwrap_ctdb.c:951…
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Is it safe to upgrade a current mysql CentOS 6.0 server to CentOS 6.5?
This server has specific configuration of php, it is also acting as a node in a DRBD cluster which holds a critical MYSQL database.
I wanted to know if this procedure is safe and if there are any other actions I should take other than backing up…
Itai Ganot
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