MSMQ from the plumber's mate

MSMQ is part of your business' IT plumbing which makes you the plumber and I'm your mate.

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  • Blog Post: Transactional MSMQ on a cluster

    Before Windows 2008 (MSMQ 4.0) there was only one option if you needed to read messages transactionally on a high availability cluster - the application had to be clustered in the same resource group as the MSMQ service hosting the queues. This was because only local receive operations could be transactional...
  • Blog Post: Update released for MSMQ 3.0 Management Pack

    This week the Management Pack for MSMQ 3.0 (Windows 2003/XP) was updated to version 6.0.6615.0 . I would list the changes but, after looking at the documentation , there appear to be several pages of them although the following two would appear to be pretty useful: · Fixed a problem when working with...
  • Blog Post: What does "Active-Active" mean to MSMQ?

    It is possible to read the documentation for clustering and think that "Active-Passive" means running MSMQ on just one node and "Active-Active" is spreading MSMQ across both nodes, giving you fault tolerance AND load-balancing. Unfortunately this isn't the case. You can’t have an Active/Active MSMQ...
  • Blog Post: Routing Support in MSMQ requires Enterprise Administrator privileges

    One down-side of enabling Routing Support for MSMQ is that you need to be an Enterprise Administrator to install it, as can be seen from this Technet article: Installation permissions Message Queuing computer Permission level required Message Queuing server on a domain controller...
  • Blog Post: Oil and water - MSMQ transactional messages and load balancing

    A really common request is to load-balance MSMQ, either to "scale out" (adding more machines, as opposed to "scale up" by enhancing the existing server) or for high availability. For load-balancing to work, the traffic must be stateless as there is no guarantee that a sending machine will be using...
  • Blog Post: Can MSMQ be deployed on an MNS Cluster?

    What the question is really asking is whether or not you can install MSMQ on a cluster without a traditional shared disk and make use of the Majority Node Set (MNS) method of keeping disks in sync instead. Looking at a selection of points from this clustering FAQ: Frequently Asked Questions (Server...
  • Blog Post: MSMQ now able to listen to multiple IP addresses on a cluster

    In the past, a clustered MSMQ service could only listen on one IP address. This was because MSMQ depended on the network name which in turn could only depend on a single address. In Windows 2008 the address dependency has been changed and now you can have multiple IP addresses: Description of...
  • Blog Post: MSMQ messages using HTTP just won't get delivered #14

    Another KB article has been published for MSMQ over HTTP: 941754 Incoming messages may be rejected by the queue manager on the cluster after you configure the clustered instance of Message Queuing to use HTTP messaging in Windows Server 2008 The principle here is that MSMQ does a reverse lookup...
  • Blog Post: MSMQ likes drive letters

    May seems to be MSMQ KB article month and there's still another half-dozen in the pipeline. This one is so tiny I might as well include all of it in this post: A clustered storage resource that does not have a drive letter may not be compatible with a clustered Message Queuing 4.0 resource ...
  • Blog Post: Clustering MSMQ applications - rule #1

    [[Updated 6th October 2008 to add KB198893]] Just a quick post about one of the main gotchas. A common misunderstanding can be over which MSMQ service is doing the work. On a simple 2-node MSMQ cluster there will be three instances of MSMQ: Running on the first physical node (let's call it...
  • Blog Post: Insufficient resources with multiple instances of MSMQ

    There's a new MSMQ KnowledgeBase article out trying to compete for the "longest title award": 940960 Error message when you run multiple instances of Message Queuing 3.0 in a Windows Server 2003-based cluster: "There are insufficient resources to perform this operation" The article is VERY light on...
  • Blog Post: Why is there a 4MB limit on MSMQ messages?

    Here's a request I've received from Dhaval Patel " I would really like to see some blog entries on how to handle messages greater than 4MB. I have heard some colleagues mention 'COM Wrappers' but I don't like the idea. To begin with, most of us were thinking that starting with Vista, the 4MB limitation...
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