Important info for LVM-on-DRBD users added to User’s Guide

November 21, 2011

My former employer has managed to roll a fresh build of the DRBD User’s Guide. This contains an important addition to the chapter on LVM: when running LVM on top of DRBD (that is, a DRBD device acting as a Physical Volume to an LVM VG), don’t forget to update your initrd after modifying your LVM filter configuration.

This is something that many users tripped over previously, so I’m happy to finally see it available in the published Guide.

There are several other additions and fixes currently pending, so I’m hoping they will publish those soon, too.

Updated OCF Resource Agent Developer’s Guide now available

November 18, 2011

I have just published an updated OCF Resource Agent Developer’s Guide. This guide is the definitive handbook for authors of, and contributors to, resource agents for the Pacemaker based Linux High Availability stack. Read the rest of this entry »

New documentation just in time for OSCON!

July 26, 2011

With OSCON in Portland under way (where LINBIT has a presence, of course), we are making three new documents available in the popular Tech Guides section of our web site.

Want to provide feedback or just chat about high availability? Our team is at OSCON booth 426, and the expo space is open 10am-4:30pm on Wednesday, and 10am-5pm on Thursday.

Incidentally, Microsoft is just across the aisle from us — perhaps you want to convince them of DRBD on Windows?

DRBD Documentation Update

July 18, 2011

Our much-anticipated DRBD 8.4.0 release has hit the wires.

It comes with cool new features such as multiple-volume replication groups, enabling write fidelity across several DRBD devices. Virtualization and Oracle database users, we’re looking at you. 8.4 also supports switching the replication protocol on the fly, so you can temporarily switch from synchronous to asynchronous replication and back. And you are now able to switch a resource into dual-Primary and back into single-Primary mode without ever taking the resource down or interrupting replication — an overdue feature much requested by our virtualization users, where it comes particularly handy for live migration.

Together with our 8.4 release, there is also a brand new edition of the DRBD User’s Guide hosted at the usual location (if you want for a printable version, look here). It has a host of new information, including but not limited to the new DRBD features — there are also updated sections on Pacemaker and Corosync, LVM, and much more. The Recent Changes appendix may be particularly useful to users transitioning from earlier DRBD versions.

What’s also new is that no part of the User’s Guide deals with legacy DRBD versions anymore — the User’s Guide will henceforth always describe the functionality of the then-current DRBD release. If you do need to refer back to functionality of previous releases, the “legacy” DRBD User’s Guide has been preserved for reference purposes.

What I am personally particularly fond of is the fact that the User’s Guide has been through a complete transformation to the text-based AsciiDoc format. This format is much more accessible for documentation writers than the previously employed DocBook XML format. And this change has already paid off: while the bulk of changes in this release still originate with yours truly, I can now welcome my LINBIT colleagues Andreas Grünbacher, Brian Hellman and Stefanie Edgar to the crowd of User’s Guide contributors.

And, as if all that weren’t enough, we have also created new and updated versions of our Tech Guides on the LINBIT web site. Watch this space over the coming weeks for interesting additions to that collection, as well.

I want to extend a big thank you to all of our community members, users and customers who have provided valuable feedback, suggestions and corrections to our documentation over the past months. This documentation release is for you.

Tech Guides to save your sanity

March 31, 2011

For those of you who sometimes find the complexity of the Pacemaker cluster stack daunting, we’ve created a bunch of Technical Guides for specific use cases. So if you want to find out how to run iSCSI targets, or MySQL, or NFS in a high availability cluster, take a look!

Registration on our web site is free. And if you’re already registered on, you can simply use your username and password from there.