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.

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Running a DRBD cluster having two different versions

Is it safe to have a cluster composed of two servers one running DRBD 8.0 one running DRBD 8.3 or 8.4 Currently there is only one DRBD server with the 8.0 data. Will the new added server on DRBD ...
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1answer
153 views

Split brain on DRBD and Pacemaker cluster

I want to put into your consideration the following situation that is currently happening on our active-passive cluster (DRBD, Pacemaker, Corosync, PostgreSQL) OS: Ubuntu server 14.04 x64 DRBD: 8.4 ...
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20 views

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 ...
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1answer
92 views

What is the proper way to shutdown an iSCSI target with connected clients?

iSCSI with two DRBD primary nodes is a bad idea to use if the two paths get concurrent write requests. But I am thinking about using this idea as backend storage for an ESXi 5.5U2 host. I already did ...
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39 views

GFS2 and DRBD, write locks, prevent read on other node

I'm setting up a dual-primary DRBD server.Using gfs as the underlying FS. Its all working as its should, fences when there is failure etc etc. My question is, is there a way to allow a node to ...
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25 views

Not sure how to change primary partition size and add a new partition on a software RAID1 using mdadm, as well as parted or fdisk?

I'm trying to create a /data partition to run drbd. However the drbd guide only shows steps for an fdisk on a normal disk, and not mdadm software raid. So I have sda3/sdb3, which are holding ...
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0answers
189 views

DRBD + corosync + pacemaker - Servers won't connect after failover

I got 2 servers configured with drbd, corosync with pacemaker. It is all working fine, primary server gets secondary if it fails, and secondary gets primary. But if the 1st server comes up again ...
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2answers
170 views

Debian 7: HA NAS with pacemaker, drbd and iSCSI

I currently am trying to make a highly available NAS under debian 7. I am using following packages: drbd8-utils iscsitarget iscsitarget-dkms pacemaker corosync ...
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1answer
162 views

DRBD as DR: syncing datastores of 2 ESXI hosts, vmdk consistency?

does anyone have experience with using DRBD (protocol C) to sync parts of the datastores of 2 esxi hosts for disaster recovery of selected guests? I have 2-3 guests that should be able to recover ...
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1answer
36 views

MySQL - data inside vm on shared storage? [closed]

I'm planning on moving all my VMs to shared storage, and I have a question about how to deal with a MySQL VM: Currently the size of the VM image is 100GB, where most of the space is taken up by the ...
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1answer
56 views

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 ...
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2answers
146 views

the pacemaker can't start the drbd resource

here is crm the configure show [root@node1 /]# crm configure show node node1 node node1.mycluster.org node node2 node node2.mycluster.org primitive Apache apache \ params ...
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2answers
171 views

drbd does not sync the mount point

i'm trying to learn drbd with centoOS 6.3 on virtual box, i have two vm configed, the node1 and node2, i copy the a file to the mount point /data which is /dev/drbd0 of node1, but not reflect to the ...
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1answer
352 views

drbd can not start the Can not load the drbd module

i'm trying to learn drbd with centoOS 6.3 on virtual box, i have two vm configed, the node 1 is original, the node 2 is cloned from node 1, but i can't start 'service drbd start' there is a error ...
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1answer
96 views

High Availability/Failover hardware hookup

I'm learning about clustering and high availability techniques, and stumbled upon an article about configuring a network with a pair of servers, using DRBD for replication and heartbeat for monitoring ...
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3answers
893 views

drbd service not startable / WFConnection

I recently migrated my drbd setup from Ubutnu to centos 7 and i get a wierd error: i can load and unload the module normally, and the whole thing seems to work #>modprobe drbd #>lsmod | grep ...
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1answer
97 views

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 ...
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803 views

Pacemaker DRBD resource not getting promoted to master on any node

First off, I'm no linux specialist, I've been following tutorials and been working with the help of google, this worked out fine until now, but currently I'm stuck with a problem. I'm using CentOS 6.5 ...
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1answer
106 views

What's the best way to sync folders across 03 or more webservers? [closed]

I have 03 servers and I want to sync some folders across them. I'm using DRBD + OCFS2 for a year or so, but it doesn't support more than 02 servers right now. I read about GlusterFS and CEPH, but ...
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2answers
310 views

Adding a 3rd node to an existing DRBD cluster

We currently have a 2 node DRBD cluster running which we would like to add a third node to. I have so far been unable to find any resources on whether it is possible to add a third node to an existing ...
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2answers
213 views

DRBD Madness on Virtual Environment (XEN)

Right now I am using DRBD to replicate two directories (/var/www and /var/spool/mail) on two different XEN VPS's and they're 7000 Miles away from each other! on the top of that I am using a ...
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2answers
224 views

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 ...
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0answers
97 views

High Availability/failsafe two different locations

I am wondering if someone could help with the setup that does not seem so difficult. I am just beginning with the multi-server setup. I apologize if my questions are dumb. I have two debian servers ...
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5answers
5k views

DRBD vs. GlusterFS for replication

I need to build a solution to host internal git repositories. It needs to supports hundreds of thousands (or more) repositories. I plan on using multiple "dumb" servers with a shared storage, so ...
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126 views

DRBD network requirements

We currently have a DRBD based replication on an pair of Asterisk servers, where we use DRBD for file and MySQL data replication on an active/passive usage scenario, using protocol B ...
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247 views

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): ...
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0answers
34 views

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 ...
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3answers
1k views

DRBD for Windows / Hyper V

DRBD is a protocol for mirroring the storage on one server with the storage on another. Essentially it gives you a highly available (HA) cluster of storage across two or more physical machines, ...
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1answer
138 views

Installing DRBD on XEN CentOS 5.8 (Stable)

I am trying for days to achieve HA with fault tolerance between my existing two XEN VPS's one located in Tokyo and the other located in US (both have the same setup and the same configurations, I am ...
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1answer
429 views

DRBD Dual Primary Revisited

It is an old datum that it is not possible to use a non-cluster-aware filesystem like ext4 on Linux with DRBD in dual-primary mode. For example, as stated by Linbit in their manual "Dual Primary - ...
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1answer
834 views

Proxmox drbd configuration split brain

I am planning a proxmox HA configuration with two Dell R710 machines (dual 6 core processors in each) with enterprise level drive raid arrays. I would be using DRBD with a quorum disk on a third ...
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2answers
346 views

Backup a DRBD resource (compressed and incremental)

I have a DRBD resource, Primary and Secondary (EXT4 - No LVM) What is the more suitable way to do a backup on the DRBD resource with compressed data and incremental backup?
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1answer
190 views

DRBD for HA Server in Small Office Questions

Backround: We are in need of a HA server in a small office environment and are looking at DRBD to provide it. We only have about 100GB that needs to be on the HA server and server load will be ...
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1answer
171 views

How long it took the initial sync drbd with a 6TB raid

I created a two node drbd drive and creating the initial synchronization of distributed file system drbd, this taking days. It is a raid5 with 3 disks 3TB each, creating a 6TB raid which mirrored by ...
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2answers
108 views

Why does DRBD infrastructure resyncs whole partition several times a day

I have a Primary/Secondary 2 nodes DRBD setting as shown global { usage-count no; } common { syncer { rate 4M; } } resource r0 { protocol B; startup { wfc-timeout 15; ...
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2answers
382 views

Using DRBD with 100mbit uplink

we are planing to use drbd to sync two servers (different hardware) to get kind of HA in case the master server dies. The servers are hosted physically in the same datacenter (Hetzner in germany) and ...
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2answers
358 views

Infiniband, SRP and failover

I am considering an linux-based infiniband storage setup, but I am tripping over whether or not I can do active/passive or active/active failover with DRBD and SRP targets. I am led to believe that ...
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0answers
53 views

DRBD mount randomly unmounts itself

We have setup setup an NFS HA "cluster" using drbd/heartbeat. Everything works as expected when tested... If the instance nfs1 goes down, nfs2 picks up and everything seems to be fine. On both ...
3
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1answer
663 views

GFS2 over DRBD automount

I have 2 nodes Proxmox cluster. For KVM images I use DRBD device with GFS2 on it. Everything works fine except GFS2 automounting after server restart. I put in fstab: /dev/drbd0 /cluster/drbd0 gfs2 ...
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0answers
1k views

LVM DRBD Shared between nodes proxmox

Context : I have proxmox cluster with the volume group shared with drbd for the VM - KVM. I have a problem with drbd. Indeed, when a node disconnect, the associate link between the differents nodes ...
4
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1answer
1k views

Dual Primary OCFS2 DRBD encountered split-brain. Is recovery always going to be manual in this case?

I've got two webservers which each have a disk attached. This disk is synced between them using drbd (2:8.3.13-1.1ubuntu1) in 'dual-primary' mode, and over the top of this I run ocfs2 (1.6.4-1ubuntu1) ...
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1answer
773 views

DRBD LVM - backed vs. physical & LVM filter

We're experimenting with DRBD/pacemaker on top of an existing Debian 6 Encrypted RAID1 setup. We have one comparatively general and one comparatively specific question: 1) DRBD - backed vs. ...
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1answer
888 views

PacemakerDRBD Mount Issue

We are stuck trying to get pacemaker to work with DRBD, and having tried various alternatives can't get our "drbd1" to mount and get some errors. NOTE: we are trying to get pacemaker to work with an ...
0
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1answer
478 views

Mirroring iSCSI target to slower drive, asynchronous RAID or block-level replication?

I'm planning on setting up a test iSCSI export on my NAS which will be used by a KVM virtualisation host to store all guest volumes and data. My NAS box is a self-build running CentOS. The device ...
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2answers
112 views

Linux partitioning suggestion for failover setup?

I've been using Ubuntu for a while but didn't really paid attention on partitioning and just accepted the defaults. But on a new project we plan on setting up two old servers HP DL380 G3 both would ...
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1answer
447 views

OpenVZ - vzdev kernel module issue

I am setting up a Centos 6.3 minimal server with openvz that replicates to another machine using DRBD. I want all openvz data/files to be kept in a single /vz directory which is an LVM that I am ...
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1answer
714 views

Centos 6.3 DRBD / OpenVZ kernel/userland issue

When I start my Centos 6.3 server's drbd service I get the following error: Starting DRBD resources: DRBD module version: 8.3.13 userland version: 8.4.2 preferably kernel and userland versions ...
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1answer
389 views

What is the best storage for active-active linux cluster? [closed]

We have a cluster with multiple ubuntu machines which are connected to a shared SAN storage. Initially we were using OCFS2 as file system but we were hit with so many issues and we couldn't find ...
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1answer
262 views

Can you use drbd8 for syncing more than two machines?

I'm really new to this. I've been struggling with how to keep multiple webservers synced. It seems like DRBD8 and OCFS2 is the way to go. However, every example I see so far keeps referencing ...
4
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3answers
3k views

Extremely slow resync rate of DRBD on dedicated gigabit

I've set up DRBD on 2 nodes, and started using it yesterday. After about an hour, it had resynced 50% of the partition. Another 12 hours passed, and it's up to 79%, and moving VERY slow. Here's what ...