Merging UDCs in VirtualWisdom to Join Manual and Generated UDCs

BAT, How to, UDC, VirtualWisdom, xmllint, xsltproc No Comments »

UDCs — User-Defined Context — can be very useful for showing the actual use, or membership of a device on the SAN, or for assigning a priority for alerting and thresholds. Often, these are hand-generated, but we do have methods of creating them from other content.

One customer has both: a UDC generated/converted from other content, and some manually-assigned content. Merging these would help him to assign filters and alerts as a single group, but the effort to merge it was looking excessive.

As you may recall, my content on Virtual Instruments Best Practices blog tend to be the how-to variety, and in this article, I’d like to share how to merge two UDCs programmatically, which can then be scripted in any automated collection scripts or tools you’re already using.

Merge, Then Cleanup

The general process we use for this is to merge the content first (using xmllint), then clean it up (using xsltproc) so that it’s back to sane, predictable UDC that is ready for routinely-scheduled import:

UDCs merged using xmllint and xsltproc

Notice in this image that the only things that change are in the upper box (“UDC Files”), which can be either manually-edited or autonomously-generated by filter or transform. As well, the result is a standard UDC from which we can generate filters or otherwise edit using XML tools.

As you can see, the tools used here are fairly standard; the only real development are the smaller scripts for each tool. UDCs are simply XML, and as such, quite easy to manipulate using standard XML tools.

Let’s break this down into the multiple steps.


The easiest way I found to concatenate two XML files was to use XInclude with an XPointer statement:

<?xml version="1.0"?>
<list xmlns:xi="">
    <xi:include href="File1.udc" xpointer="xpointer(//list/*)"/>
    <xi:include href="File2.udc" xpointer="xpointer(//list/*)"/>

In parts, this is really duplicates of the following:


If you’ve written any sourcecode, you’d recognize an #include statement, or an import com.example.*; this is really no different: the document referenced by the “href” (File1.udc) replaces this xi:include statement. The second part, an xpointer="...", further clarifies the import by indicating that only a part of the document we include should come in — in this case, child elements of the “list” element. If you look at a UDC File, you’ll see that “list” is the root node; if that statement makes very little sense, then think of this as “we’re including all the stuff inside the outermost container, but not the container itself”. And hey, look again at the full file above: we specify a <list> and </list> around the inclusions. Coincidence? Not at all; this is a method of avoiding having two outermost root nodes, which cannot be further altered using XML because XML can only have one outermost root node.

…and it’s easier this way: don’t filter out what you can avoid including in the first case. It’s possible that there’s a better set of inclusion elements here, but this works well enough.

If we had three UDCs to merge, you can see that it would merely require another xi:include statement.

To act on this file, we execute xmllint using the “-xinclude” parameter (normal hyphen, only one “-”, not two) as follows. Note that xmllint is available on most non-Windows systems, and should be easily acquired using Microsoft Services for UNIX for a Windows system.

xmllint.exe -xinclude concatenate-UDC.xml > Merged.udc

for Windows, or for non-windows:

xmllint -xinclude concatenate-UDC.xml > Merged.udc

(using “Merged.udc” as a temporary file)

We now have a UDC file with only one outermost “list” element or root element, but it has a few problems:

  1. Every new UDC starts with Evaluation Order of 1; this is reflected in the UDC, and has to be fixed
  2. Only one default item should be given: we choose the one from the first file
  3. We only copy the first file’s definition of the UDC (Metric, set, etc) so the user needs to avoid doing this on two UDCs of different metric/set (illogical UDCs will result)

The first two issues can be fixed in the next step.

Clean the Concatenated Result

XSLT, or XSL Transformations, uses XSL (Extensible Stylesheet Language) to transform XML into a different XML, or even into a simpler form such as straight text or ambiguous markups such as CSV. In general, XSLT can map XML data from one schema to another, convert data from one schema to another, or simply extract elements of data into a text stream.

In our case, we’re using it to remove the redundant parts that will cause VirtualWisdom’s UDC parser to reject the document. There is currently no schema definition, so we have to make best efforts to make the resulting UDC look like one exported from VirtualWisdom.

The XSLT is a bit complex to post here, but it should be available by clicking on the marked-up filename below. Note that like xmllint, xsltproc is widely available as Linux and UNIX packages, or via the Microsoft Services for UNIX (currently a re-packaged Cygwin environment).

We execute the cleanup XSLT as follows:

xsltproc.exe concatenate-UDC.xsl Merged.udc > VirtualWisdomDataUDCImportCombined.udc

for Windows, or for non-windows:

xsltproc concatenate-UDC.xsl Merged.udc > VirtualWisdomDataUDCImportCombined.udc

Note here that the file we use is similarly-named, but end in “xsl”, not “xml”. Also, we write the file directly into the UDCImport directory of a VirtualWisdomData folder, which is where an import schedule would look for it.

This resulting file can be directly imported; an example import schedule is at the bottom of the Use UDCs to Collect Devices by Name Pattern article presented on May 1st, 2012. As well, because the UDC is in a standard form, it can be used to Quickly Create Filters for use in Dashboards, Reports, and Alarms.

Evolving SANs tend to have evolving naming schemes and assignment methods, so there will often be many different systems of identifiers that can be joined to work with different Business Units, customers, or functional groups; different such groups tend to cause different sources of information to be polled, and different formats to result. I hope this process help you to reduce the manually copying of data attributes which is so prone to human error and scheduling delays.

I hope this helps you to “set it and forget it” on more sources of data. Accurate data drives decisions: how can you methodically fix what you cannot measure and make sense of?

Edit 2012-08-23: concatenate-UDC.xsl was misspelled on the webserver (concatenate-UDCs.xsl), four downloads failed due to my error. Sorry, it should be easier to download now.

Quickly Create Filters for VirtualWisdom UDC Values

Filters, How to, UDC, xsltproc No Comments »

The UDC capability in VirtualWisdom enables quite a powerful ability to group fabric entities based on a number of parameters, but creating the filters to use a large UDCs can be a bit cumbersome. UDC is VirtualWisdom’s User-Defined Context, allowing a virtual metric value to be defined within summaries, calculated based on powerful expressions.

Typically, UDCs are used to separate and group entities such as:

  • Physical Datacenter to filter physical-layer alerts (such as CRCs) to the correct ticket queue for inspection
  • Business Unit (BU) UDCs to filter performance alerts (such as response-time) against Business-Unit -specific thresholds (i.e. Oracle requires 12ms response time, but the NFS filer accepts 20ms)
  • Port/Blade/ASIC calculations
  • Grouping a SuperDome’s ports or an Array’s ports for filtered reports

As well, UDCs are used for “what-if” calculations: What if the SCSI traffic from a certain HBA was zoned to a different storage port, which it overload the Queue and link speed? What-if UDCs are an extremely powerful tool to prove capacity based on historical use, but somewhat out-of-scope for this article.

My content in Virtual Instruments’ SAN Best Practices tend to be of the how-to nature; in this article, I’d like to share a simple method of creating all the “X = Y” filters for a specific UDC programmatically, which can reduce the time-to-value in new installs or changing environments. When linked with other generation how-to articles (such as nickname collection, or generating UDC by transform), this can further reduce the effort of managing a very large SAN.

Process Overview

For this process, our workflow will look like the following:

As you can see, the starting file “UDCExport.udc” can be either exported from the VirtualWisdom Portal itself, or can be generated by other means. The file is converted using xsltproc using a “program” or “script” UDC2Filter.xsl, resulting in Filters.xml which can be imported manually to VirtualWisdom.


UDC Files in VirtualWisdom are a specific schema of XML file; as such, standard easily-available license-free tools such as xpathget, xmllint, or xsltproc can be used to interrogate, validate, or convert the starting XML to a different format, even generating CSV or simple text in the process.

XSLT is the XML Stylesheet Translations; XSL is a Stylesheet for XML, similar to CSS describing the stype of a free-form HTML page. In essence, XSL can be considered an CSS in XML, but rather than markup content — such as type facing and style for large printed content — XSL can also transform and convert content. XSLT is the act of using XSL markup in a standalone processor (xsltproc) to create content based on XML content. In many cases, this is XML generating XML, but can be used to write TSV, CSV, JSON, etc.

VirtualWisdom Filters are exported as another schema of XML file, and can be similarly manipulated by standard XML tools. Even though this XML is a text-based format, trying to edit it with a text editor can be prone to human-error. We can read XML for debugging (xmllint -format), but as the size of the content gets larger, to use it as thought XML is an opaque binary format, which again leads us to the free tool “XSLT”.

In our case, a specific XSLT file is used to manipulate a UDC definition into a list of Filter definitions: UDC2Filter.xsl guides the conversion of UDC Values to Filters which match them.

Running the Script

xsltproc is available on most non-Windows platforms as an installable RPM, SSO, .deb, .pkg, or similar pre-packaged open source project; on Windows, it can be installed per SageHill’s Instructions; a file is easily obtained from any VI FAE to accelerate your install process.

Running it is quite simple:

xsltproc.exe -o Filters.xml UDC2Filter.xsl UDCExport.udc

There’s no output: all generated content goes directly to the output filter file.

Complete Example

In order to show how the full process, in case I’ve left out some details or some details seem implied, this is a full example based on data in our demo databases (which we use for demos and training):

Given the following UDC:

UDC that we start with for our example UDC2Filter

We export this UDC to Application_SW.udc, run the XSL Transform as follows:

xsltproc.exe -o Application_SW_Filters.xml UDC2Filter.xsl Application_SW.udc

The result we get in Application_SW_Filters.xml looks like this:

Clearly this example is only a few filters, no big deal. The benefit comes in when there are more than a half-dozen to build (recently, a 212-value UDC was tested). As well, if the UDC is edited (perhaps based on automated processes) then the administrator must go through and check that every value has a filter.

Unfortunately, there is no schedule-action for Filter import.

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