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Showing entries 1 to 26

Displaying posts with tag: drbd (reset)

High-availability options for MySQL, October 2013 update
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The technologies allowing to build highly-available (HA) MySQL solutions are in constant evolution and they cover very different needs and use cases. In order to help people choose the best HA solution for their needs, we decided, Jay Janssen and I, to publish, on a regular basis (hopefully, this is the first), an update on the most common technologies and their state, with a focus on what type of workloads suite them best. We restricted ourselves to the open source solutions that provide automatic failover. Of course, don’t simply look at the number of Positives/Negatives items, they don’t have the same values. Should you pick any of these technologies, heavy testing is mandatory, HA is never beyond scenario that have been tested.

Percona XtraDB  [Read more...]

Holding MySQL HA workshop in Oxford
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On 17th October I’ll be running a hands-on workshop on the various technologies available to provide High Availability using MySQL. The workshop is being held on 17th October (the day before the All Your Base conference) in Oxford (UK). The cost is £250 + VAT and you can register here.

This workshop provides an introduction to what High Availability (HA) is; what technology options are available to achieve it with MySQL and how to actually implement your own HA solutions. The session will be a mixture of presentations,

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The network is reliable
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A fascinating post-mortem on high profile network failures:

This post is meant as a reference point–to illustrate that, according to a wide range of accounts, partitions occur in many real-world environments. Processes, servers, NICs, switches, local and wide area networks can all fail, and the resulting economic consequences are real. Network outages can suddenly arise in systems that are stable for months at a time, during routine upgrades, or as a result of emergency maintenance. The consequences of these outages range from increased latency and temporary unavailability to inconsistency, corruption, and data loss. Split-brain is not an academic concern: it happens to all kinds of systems–sometimes for days on end. Partitions deserve serious consideration.

Choosing a MySQL HA Solution – MySQL Webinar: June 5
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Selecting the most appropriate solution for a MySQL HA infrastructure is as much a business and philosophical decision as it is a technical one, but often the choice is made without adequately considering all three perspectives.  When too much attention is paid to one of these aspects at the cost of the others, the resulting system may be over-engineered, poorly-performing, and/or various other flavors of suboptimal.

On Wednesday, June 5, at 10 a.m. PDT (1700 UTC), I will be presenting a webinar entitled, Choosing a MySQL HA Solution, in

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New Options for MySQL High Availability
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Data is the currency of today’s web, mobile, social, enterprise and cloud applications. Ensuring data is always available is a top priority for any organization – minutes of downtime will result in significant loss of revenue and reputation.

There is not a “one size fits all” approach to delivering High Availability (HA). Unique application attributes, business requirements, operational capabilities and legacy infrastructure can all influence HA technology selection. And then technology is only one element in delivering HA – “People and Processes” are just as critical as the technology itself.

For this reason, MySQL Enterprise Edition (http://www.mysql.com/products/enterprise/) is available supporting a range of HA solutions, fully certified and supported by Oracle. MySQL Enterprise HA

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MySQL now provides support for DRBD
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Oracle has announced that it now provides support for DRBD with MySQL – this means a single point of support for the entire MySQL/DRBD/Pacemaker/Corosync/Linux stack! As part of this, we’ve released a new white paper which steps you through everything you need to do to configure this High Availability stack (http://www.mysql.com/why-mysql/white-papers/mysql_wp_drbd.php). The white paper provides a step-by-step guide to installing, configuring, provisioning and testing the complete MySQL and DRBD stack, including:

  • MySQL Database
  • DRBD kernel module and userland utilities
  • Pacemaker and Corosync cluster messaging and management processes
  • Oracle Linux operating system

DRBD is an extremely popular way of adding a layer of High

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The best MySQL multi-master solution gets even better
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The best (and truly the only) MySQL multi-master, multi-site solution on the market gets even better! Continuent is happy to announce immediate availability of Continuent Tungsten 1.5.New Continuent Tungsten 1.5 allows you to build multi-site, disaster recovery (DR) and multi-master solutions with ease: Multi-Master Operations - Tungsten can support your multi-master operations today by linking
New Continuent Tungsten 1.5 now available
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The best MySQL high availability solution on the market gets even better! We are happy to announce immediate availability of Continuent Tungsten 1.5.New Continuent Tungsten 1.5 offers significant improvements that help you to deploy cost effective HA clusters fast include: Easy Installation - One-step command to deploy an entire Tungsten cluster in minutes, either in your data center or in
Vote for MySQL[plus] awards 2011 !
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First of all, I wish you a happy new year.
Many things happened last year, it was really exciting to be involved in the MySQL ecosystem.
I hope this enthusiasm will be increased this year, up to you !

To start the year, I propose the MySQL[plus] Awards 2011
It will only take 5 minutes to fill out these polls.
Answer with your heart first and then with your experience with some of these tools or services.

Polls will be closed January 31, so, vote now !
For “other” answers, please,  let me a comment with details.

Don’t hesitate to submit proposal for tools or services in the comments.

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Quick How-To for DRBD + MySQL + LVS
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I wrote this up a while ago and decided that I didn’t want to lose it in a shuffle of documents during my transition to a new workstation. It’s the basics of setting up Heartbeat (LVS) + DRBD (block replication between active/passive master servers) + MySQL. This should give you the basics of a H/A system without the benefits of SAN but also without the associated cost. The validity of this setup for H/A purposes is highly dependent on your workload and environment. You should know the ins and outs of your H/A solution before deciding to blame the system for not performing as expected. As with all production systems you should test, test, test and test some more before going live.

When I get around to it later I’ll post my How-To for setting up RHCS + SAN + MySQL. You can download the DRBD document PDF here:

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Howto setup MySQL on a DRBD volume
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One more DRBD tutorial, this time I will describe howto setup MySQL with DRBD (Distributed Replicated Block Device). Purpose This document describes how to to setup a failover system with MySQL and DRBD (Distributed Replicated Block Device). Introduction In this tutorial we will setup two Debian Linux nodes with a DRBD volume. MySQL will be [...]
High Availability MySQL Cookbook , the review
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When I read on the internetz that Alex Davies was about the publish a Packt book on MySQL HA I pinged my contacts at Packt and suggested that I'd review the book .

I've ran into Alex at some UKUUG conferences before and he's got a solid background on MySQL Cluster and other HA alternatives so I was looking forward to reading the book.

Alex starts of with a couple of indepth chapters on MySQL Cluster, he does mention that it's not a fit for all problems, but I'd hoped he did it a bit more prominently ... an upfront chapter outlining the different approaches and when which approach is a match could have been better. The avid reader now might be 80 pages into MySQL cluster before he realizes it's not going to be a match

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Why you can’t rely on a replica for disaster recovery
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A couple of weeks ago one of my colleagues and I worked on a data corruption case that reminded me that sometimes people make unsafe assumptions without knowing it. This one involved SAN snapshotting that was unsafe.

In a nutshell, the client used SAN block-level replication to maintain a standby/failover MySQL system, and there was a failover that didn't work; both the primary and fallback machine had identically corrupted data files. After running fsck on the replica, the InnoDB data files were entirely deleted.

When we arrived on the scene, there was a data directory with an 800+ GB data file, which we determined had been restored from a SAN snapshot. Accessing this file caused a number of errors, including warnings about accessing data outside of the partition boundaries. We were eventually able to coax the filesystem into

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Quest for Resilience: Multi-DC Masters
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This is a Request for Input. Dual MySQL masters with MMM in a single datacentre are in common use, and other setups like DRBD and of course VM/SAN based failover solutions are conceptually straightforward also. Thus, achieving various forms of resilience within a single data-centre is doable and not costly.

Doing the same across multiple (let’s for simplicity sake limit it to two) datacentres is another matter. MySQL replication works well across longer links, and it can use MySQL’s in-built SSL or tools like stunnel. Of course it needs to be kept an eye on, as usual, but since it’s asynchronous the latency between the datacentres is not a big issue (apart from the fact that the second server gets up-to-date a little bit later).

But as those who have tried will know, having a client (application server) connection to a MySQL instance in a remote data-centre

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webcast – DRBD & MySQL High Availability
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I recently presented a webcast hosted by O’Reilly and Webex.  In it I take you on a step-by-step installation of DRBD and MySQL.  I start by using Sun’s Virtualbox to create to virtual machines running CentOS.  I then explain how to configure them with virtual external drives to use for DRBD.  I next configure the network interfaces to support routed packets into and out of the boxes.  Then I install various packages with yum, configure drbd and finally install MySQL as the last step.  You can follow along at the command line and do it yourself on a Windows, Mac or Linux box.

Nines , Damn Nines and More Nines
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Funny how different experiences lead to different evaluations of tools. The MySQL HA solutions the MySQL Performanceblog list, are almost listed in the complete opposited order of what my impressions are.

Ok agreed, I should probably not put my MySQL NDB experiences from 2-3 years ago with multiple Query of deaths and more problems than you into account anymore , but back then went in the list Less stable than a single node. I've had NDB POC setups going down for much more than 05:16 minutes
Ndb comes with a lot of restrictions, there are

As for MySQL on DRBD, I've said this before , I love DRBD, but having to wait for a long InnoDB recovery after a failover

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Percona welcomes Yves Trudeau and Fernando Ipar
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I'm happy to extend a warm welcome to two new members of the Percona team.

First is Yves Trudeau, about whom I can say many things:

  • One of the top MySQL Cluster (NDB Cluster) experts in the world.
  • An expert on all things High Availability, including DRBD and Heartbeat.
  • Many years of experience with Huge Data.
  • Half of the Waffle Grid team.
  • A really nice person!

Yves joins us after a tenure of several years as a senior consultant at Sun/MySQL. Together with Matt Yonkovit, he plans to work on WaffleGrid (but as a new project under a new name, to be determined), and integration with XtraDB. Yves lives in Quebec with his family.

Next is Fernando Ipar. Fernando is our first dedicated Shift Support Captain[1]. Fernando specializes in MySQL, GNU/Linux, systems administration, and

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Is DRBD the right choice for me?
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It seems pretty common to find customers install DRBD for the wrong reasons. There are many pros/cons to compare DRBD to replication, but I've managed to cut down my spiel I give to customers to these two points:

  • DRBD's aim (assuming replication mode C) is to provide 100% consistency, and then as much uptime as possible.
  • MySQL Replication (with a manager such as MMM) aims to have 100% availability, at the potential loss of some data surrounding a failure.

So if you are installing DRBD with the aim of purely "availability", and are not worried about losing that last write on the crash to your master database that (hopefully) happens only once every few years, you may be using the wrong technology.

While the prized "1 minute failover" is possible in DRBD, it doesn't

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DRBD Management Console
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Wow, check out what just came out from Linbit: The DRBD Management Console. Written in Java (so it runs anywhere), completely open source (GPLv3), and allows you to manage DRBD and Heartbeat based clusters. You can install, configure, see your systems graphically, and a lot more. I’m interested to try the beta out, as soon as I get back to my lab (sitting in the airport now). If you know how to use DRBD/Heartbeat, and use it in production for your MySQL setup, it might be a good application to test out, and improve if need be.

From the screenshots, I’m surprised this isn’t a value added extra that Linbit would like to charge for. Kudos, Linbit, for keeping it GPLv3!

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High Availability with DRBD and Heartbeat Presentation
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Here's my presentation I gave June 9, 2008, at the Twin Cities MySQL and PHP User Group about my highly available cluster using DRBD and Heartbeat. I added a few slides and cleaned things up a bit. The presentation went well and we had a lot of good questions. The MySQL and PHP User Group will be taking some time off over the summer. There will be another meetup mid-summer to come up with some ideas for future meetings.
High Availability with DRBD and Heartbeat Presentation
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Here's my presentation I gave June 9, 2008, at the Twin Cities MySQL and PHP User Group about my highly available cluster using DRBD and Heartbeat.

I added a few slides and cleaned things up a bit. The presentation went well and we had a lot of good questions.

The MySQL and PHP User Group will be taking some time off over the summer. There will be another meetup mid-summer to come up with some ideas for future meetings.

Summary of beCamp 2008
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Yesterday I went to beCamp 2008 along with four roomfuls of other people interested in technology (perhaps close to 100 people total). The conference was a lot of fun. Not everything went as planned, but that was as planned. This was an Open Spaces conference and I thought it worked very well. From an email Eric Pugh sent:

Basically it all boils down to:

Open Space is the Law of Two Feet: if anyone finds themselves in a place where they are neither learning nor contributing they should move to somewhere more productive. And from the law flow four principles:

  • Whoever comes are the right people
  • Whatever happens is the only thing that could have
  • Whenever it starts
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MySQL and DRBD, Often say NO :)
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Florian is replying to James on the subject of using DRBD for MySQL HA. A discussion started earlier by Eric Florian is refuting most of the arguments that James has against using MySQL and DRBD together.

I`m also saying NO to MySQL and DRBD in most of the cases.. but not for any of the reasons James mentions.

I must say upfront I love DRBD and I have been using it in production for a long time but not for MySQL HA.

The problem with using MySQL on DRBD is the same problem you have when killing the power on a standalone MySQL machine and rebooting that machine.
DRBD saves you the time of powering up your machine and OS. But MySQL still

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High-availability MySQL and DRBD
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The day of tutorials started out with All Bases Covered: A Hands-on Introduction to High-availability MySQL and DRBD by Florian Haas and Philipp Reisner.

After a brief introduction to DRBD, they started discussing the configuration file. There were a couple settings that I had set incorrectly on my servers.

Since I have my two servers connected via a gigabit crossover cable, I had my synchronization rate set to 125MB. They recommended approximately 1/3 your network and disk I/O so that you're applications don't freeze up during synchronization. Their test system used 30MB so I'll give it a try too.

Another setting they had different was the activity log extents. All of the references I looked at said to set

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My Wishlist - Do you have a product you can recommend?
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One of the concepts of clustering, is that the secondary node may need to stonith the primary node in a forced take over in order to make it give up shared resources. This works great on more expensive hardware that has a management interface like IPMI, but my 'toys' budget is a little more limited.

It's equally possible to just cut the node off at it's power source. Does anyone know of a (cheap) power strip with a serial[1]/usb[1]/network interface where I can send signals to cut off individual ports power?

If I can't switch off individual power ports, I will need to buy two and have the nodes each manage the opposite node's power.

[1] If it's serial or USB I'll need to use a third node as a proxy to the device, which is annoying, but quite possible.
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Yesterday Phillip Reisner was giving an introduction to DRBD. I won't get into it here, but essentially it's a way to keep blockdevices on two different hosts in sync to get a kind of shared disk. (Go read about it on their site!)

I've used it for a while to get high-availability from two NFS servers and I always recommend it in my scalability talk. It's awesome. (Heartbeat which is the "fail-over" software in the typical configuration isn't so great, more on that another time).

Anyway, being at the MySQL conference the context of course is "how can this be used for MySQL". Usually I prefer a simpler master-master replication setup for redundancy. Later in the afternoon Mats Kindahl (one of the replication developers)

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Showing entries 1 to 26

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