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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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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850 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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1k 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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598 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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238 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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313 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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119 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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483 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
539 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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968 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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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 ...
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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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1k 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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1k 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 ...
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1answer
644 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
144 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
729 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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847 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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567 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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384 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 dual-...
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3answers
6k 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 ...
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mount.ocfs2: Transport endpoint is not connected while mounting…?

I have replaced a dead node that was running in dual-primary mode with OCFS2. All the steps work: /proc/drbd version: 8.3.13 (api:88/proto:86-96) GIT-hash: 83ca112086600faacab2f157bc5a9324f7bd7f77 ...
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1answer
2k views

Redhat cluster Vs Pacemaker Vs Gluster Vs Sheepdog

Changing the entire question as earlier one was very confusing. I have been exploring different clustering system to run Virtual machines on two different machines on LAN with high availability. ...
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822 views

adding drbd to an existing lvm

I'm going to add drbd to an existing LVM, I want to keep LVM data. I follow this post: http://lists.linbit.com/pipermail/drbd-user/2009-February/011464.html what I already did stopped kvm virtual ...
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124 views

DBRD dual primary Heartbeat resource management

I have the following setup: Two servers with DRBD running dual primary with OCFS2 Heartbeat with two virtual ips, one for each server Round robin DNS to load balance NFS across the two vIPs ...
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6k views

DRBD status :- UpToDate/Diskless

I was configuring two DRBD shares for our servers. I have successfully completed two DRBD share creation, but while checking the status one of the shares status is showing as "UpToDate/Diskless". ...
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308 views

drbd master/master without cluster FS

I have planed to use master-slave setup and make nightly backups (just coping data) from slave node to 3rd node. As I understand in master-slave mode it is impossible to read data from slave node? So ...
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656 views

DRBD configuration

I was going through the configuration of DRBD on two nodes. The DRBD has already configured, but I would like to enable the dual primary mode feature. On drbd site I have seen that it requires the ...
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5answers
1k views

DRBD with MySQL

Question about using DRBD to provide HA for MySQL. I need to be sure that my backup MySQL instance is always going to be in a functional state when the failover occurs. What happens, for example, ...
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1answer
532 views

DRBD keeps crashing over saturated link

Under high I/O DRBD will crash and take server down; is there anyway to optimize DRBD to prevent from happening again. listed below is my current config, errors and specs. if you need any more ...
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1k views

Calculating DRBD Meta Size

I've read through the documentation provided at http://www.drbd.org/users-guide/ch-internals.html#s-meta-data-size to establish the DRBD meta size, but I'm struggling to correlate that to actual disk ...
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DRBD heartbeat's resource role trouble in centos 5.4 by mysql files owner change?

I am using 2 machines with centos,mysql,drbd,heartbeat,asterisk. node 1 has hdc :SAMSUNG HD160JJ/P, ATA DISK drive kernel version 1 SMP Tue Aug 21 17:50:26 EDT 2012 kernel release 2.6.18-308.13.1....
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3k views

Magento hosting on a budget

I have to do a setup for Magento. My constraint is primarily ease of setup and fault tolerance/fail over. Furthermore costs are an issue. I have three identical physical servers to get the job done. ...
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2k views

Possible to use DRBD on two ESXi virtualized servers?

I have two servers (attached disks have been set up as hardware RAID1 for disk device level failure resilience). Here is the setup in my mind: 1) Install ESXi on each of the physical server, M1, M2; ...
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585 views

Kernel panic when bringing up DRBD resource

I'm trying to set up two machines synchonizing with DRBD. The storage is setup as follows: PV -> LVM -> DRBD -> CLVM -> GFS2. DRBD is set up in dual primary mode. The first server is set up and ...
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2answers
576 views

Drbd Primary/Primary + iSCSI: accessing to different files avoids split brain?

I have a question / curiosity about split-brain on a Drbd Primary/Primary configuration. Supposing two nodes (hosts), host1 and host2 configured with Drbd Primary/Primary and two different shares (NFS,...
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1answer
544 views

Pacemaker corosync 2-node with a 3rd for quorum

I'm having trouble figuring out how to configure a 2-node setup with a third simpler one for quorum. It seems to think all the nodes have the capability to act as a full fallback node, when I only I ...
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724 views

STONITH with a DRBD/Pacemaker/Corosync 2 node cluster

So I am seeing a lot of conflicting viewpoints out there on using STONITH with a 2-node DRBD/Pacemaker/Corosync cluster for replicating MySQL data. The example I could find on the Pacemaker website ...
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81 views

Rsync through the internet

I'm looking for a way to copy files from production server to DRP server via internet. The two servers are in different states. For now, there isn't a lot of data to transfer but I suspect it might go ...
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1answer
3k views

How to resize DRBD disk on LVM?

this is my drbd config resource mysql { protocol C; floating 10.100.101.1:7788 { device /dev/drbd0; disk /dev/VolGroup00/LogVol02; meta-disk ...
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2answers
8k views

Can not switch drbd to secondary

I'm running drbd83 with ocfs2 in centos 5 and planning to use packemaker with them. Afer some time, I'm facing drbd split brain problem. version: 8.3.13 (api:88/proto:86-96) GIT-hash: ...
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2answers
176 views

DRBD(-alike) solution to enable failover for spool files

Im about to setup a failover-setup for our Kannel service using hardbeat and DRBD. One machine is the primary one, when that one dies/goes down, it switches to the secondary. Kannel is using a spool ...
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1answer
583 views

NFS failover WITHOUT DRBD?

So I am trying to set up a redundant NFS share in a cloud environment(all links internal, half gig links), and I am looking into using heartbeat for failover, but all the guides seem to be about ...
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1answer
3k views

Is it possible to create a multipath iSCSI target with two DRBD nodes?

I can put together two linux servers and use the (more or less) new DRBD dual-primary feature to get a shared block device with concurrent read/write access on the two nodes. Can I then export an ...
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1k views

Heartbeat/DRBD failover didn't work as expected. How do I make the failover more robust?

I had a scenario where a DRBD-heartbeat set up had a failed node but did not failover. What happened was the primary node had locked up, but didn't go down directly (it was inaccessible via ssh or ...
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1k views

Xen DomU on DRBD device: barrier errors

I'm testing setting up a Xen DomU with a DRBD storage for easy failover. Most of the time, immediatly after booting the DomU, I get an IO error: [ 3.153370] EXT3-fs (xvda2): using internal journal ...
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197 views

how to extend the DRBD device online on production server?

Hey folks i am trying to extends the size of DRBD device (/dev/drbd0) online on production server but have to bring down and up the device (/dev/drbd0) twice so the change in size is detected. I ...
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2answers
512 views

RAID -> LVM -> DRBD am I doing it right?

So I've setup RAID1 with an LVM on that and then used the LVM as a physical disk for DRBD. I'm planning on mounting the DRBD to /mnt/data and then moving all config and data files for apache2, mysql, ...
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1k views

How do you configure Pacemaker to mount the DRBD data directory on the slave?

how do you get the Slave node of a DRBD pair to mount the data directory so data can be sync'd? I went through the following guide: https://wiki.edubuntu.org/ClusterStack/Natty#Prepare_Partitions to ...
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411 views

Sync SSD to spindle drive using RAID or DRBD

I'm setting up a server with and SSD as the primary drive, and would like to duplicate the data onto a cheaper drive as a block-level backup (à la RAID1). Since I don't want to hobble the performance ...