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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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
518 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
117 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
510 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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764 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
424 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
296 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 ...
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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 ...
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1answer
4k views

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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1answer
603 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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1answer
112 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 ...
4
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1answer
4k 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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1answer
279 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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3answers
553 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
872 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
460 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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1answer
671 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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0answers
175 views

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 ...
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2answers
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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2answers
1k 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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2answers
496 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
458 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 ...
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1answer
406 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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1answer
590 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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1answer
78 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
2k 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
5k 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
165 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
520 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
2k 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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2answers
914 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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2answers
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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1answer
165 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
441 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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1answer
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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1answer
345 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 ...
2
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1answer
434 views

Need an interface for an Elastic IP (DRBD & EC2)

We are trying to mirror a volumes over a geographical zone using DRBD (and Ubuntu 11.10). We are using elastic IP's - however there is no local interface for Elastic IP's - only an interface for a ...
3
votes
1answer
7k views

DRBD Not syncing between my nodes

Some version info: Operating system is Ubuntu 11.10, on EC2, kernel is 3.0.0-16-virtual and the application info is: Version: 8.3.11 (api:88) GIT-hash: 0de839cee13a4160eed6037c4bddd066645e23c5 build ...
3
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1answer
1k views

DRBD Not starting on Fresh AWS 64-bit Ubuntu 11.10

I followed these instructions precisely (I've done this from scratch using 11.04 and 11.10 with the same results using AMI's ) (using 11.04) Community AMI: ami-e016ca89 ...
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2answers
14k views

How to setup STONITH in a 2-node active/passive linux HA pacemaker cluster?

I am trying to setup an active/passive (2 nodes) Linux-HA cluster with corosync and pacemaker to hold a PostgreSQL-Database up and running. It works via DRBD and a service-ip. If node1 fails, node2 ...
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6answers
1k views

Safe filesystem for Email homedir storage? XFS? JFS? Btrfs? Reiser4?

i'm building an email system and considering some filesystem that support online-resize, safe when power-outage, and does not restrict number of files per directory(or at least can hold some millions ...
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2answers
161 views

Multi Workstation DRBD Setup

I'm considering setting up a way to automate data redundancy and synchronisation of multiple workstations at the office. The way our office is setup, nobody has a fixed desk and anyone can login and ...
2
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1answer
541 views

Ganeti and automatic failover

I'm building a simple 2-node cluster with Ganeti+DRBD... What is the recommended way to setup automatic failover? I'm used to Heartbeat, but they say it should be avoided with my setup.
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1answer
1k views

Best RAID setup for DRBD

I would like to setup a two nodes PROXMOX cluster with DRBD storage. The nodes will be connected by gigabit ethernet. What would be the best storage setup in terms of reliability, performance and ...
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4answers
2k views

DRBD or similiar RAID over net on slow/limited networks

I am looking for ways to create some kind of file replication without losing too much performance on file operations. A real RAID is not an option due to non-technical constraints. As far as I ...
2
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1answer
2k views

Cheap, reliable high availability solution?

We're looking for a way to improve the reliability of one of our servers (Apache/MySQL/Virtualmin setup). So far, we've had every possible kind of clusterfuck with that server in the past six months ...
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4answers
668 views

A better inexpensive 2 node cluster

There is a Xen cluster that setup that I really like. It consists of 2 nodes (let's call them 1 and 2). Each node has 2 non-raided drives (A and B). A1 replicates to A2 through DRBD and B2 to B1. ...
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1answer
697 views

Fault-tolerant KVM hosts

I'm going to create a simple virtual hosts infrastructure using QEMU+KVM. It is expected to be very simple, without clouds or any other cool things. Right now the only requirement is the ...