Informix News
18 Nov 13 - ZDNet - Top 20 mobile skills in demand... Read
09 Sep 13 - telecompaper - Shaspa and Tatung have shown a new smart home platform at Ifa in Berlin. Powered by the IBM Informix software... Read
06 Sep 13 - IBM data magazine - Mission Accomplished - Miami, Florida will be the backdrop for the 2014 IIUG Informix Conference... Read
01 Feb 13 - IBM Data Magazine - Are your database backups safe? Lester Knutsen (IBM Champion) writes about database back up safety using "archecker"... Read
14 Nov 12 - IBM - IBM's Big Data For Smart Grid Goes Live In Texas... Read
3 Oct 12 - The Financial - IBM and TransWorks Collaborate to Help Louisiana-Pacific Corporation Achieve Supply Chain Efficiency... Read
28 Aug 12 - techCLOUD9 - Splunk kicks up a SaaS Storm... Read
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2 Aug 12 - channelbiz - Oninit Group launches Pay Per Pulse cloud-based service... Read
28 May 12 - Bloor - David Norfolk on the recent Informix benchmark "pretty impressive results"... Read
23 May 12 - DBTA - Informix Genero: A Way to Modernize Informix 4GL Applications... Read
9 Apr 12 - Mastering Data Management - Upping the Informix Ante: Advanced Data Tools... Read
22 Mar 12 - developerWorks - Optimizing Informix database access... Read
14 Mar 12 - - International Informix User Group set to meet in San Diego... Read
1 Mar 12 - IBM Data Management - IIUG Heads West for 2012 - Get ready for sun and sand in San Diego... Read
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24 Feb 12 - developerWorks - Informix Warehouse Accelerator: Continuous Acceleration during Data Refresh... Read
6 Feb 12 - PRLOG - Informix port delivers unlimited database scalability for popular SaaS application ... Read
2 Feb 12 - developerWorks - Loading data with the IBM Informix TimeSeries Plug-in for Data Studio... Read
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13 Jan 12 - MC Press online - Informix Dynamic Server Entices New Users with Free Production Edition ... Read
11 Jan 12 - Computerworld - Ecologic Analytics and Landis+Gyr -- Suitors Decide to Tie the Knot... Read
9 Jan 12 - - DNS impact on Informix / Impacto do DNS no Informix... Read
8 Sep 11 - - IBM Offers Database Solution to Enable Smart Meter Data Capture... Read
1 Aug 11 - IBM Data Management Magazine - IIUG user view: Happy 10th anniversary to IBM and Informix... Read
8 Jul 11 - Database Trends and Applications - Managing Time Series Data with Informix... Read
31 May 11 - Smart Grid - The meter data management pitfall utilities are overlooking... Read
27 May 11 - IBM Data Management Magazine - IIUG user view: Big data, big time ( Series data, warehouse acceleration, and 4GLs )... Read
16 May 11 - Business Wire - HiT Software Announces DBMoto for Enterprise Integration, Adds Informix. Log-based Change Data Capture... Read
21 Mar 11 - Yahoo! Finance - IBM and Cable&Wireless Worldwide Announce UK Smart Energy Cloud... Read
14 Mar 11 - MarketWatch - Fuzzy Logix and IBM Unveil In-Database Analytics for IBM Informix... Read
11 Mar 11 - InvestorPlace - It's Time to Give IBM Props: How many tech stocks are up 53% since the dot-com boom?... Read
9 Mar 11 - DBTA - Database Administration and the Goal of Diminishing Downtime... Read
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27 Jan 11 - exactsolutions - Exact to Add Informix Support to Database Replay, SQL Monitoring Solutions... Read
25 Jan 11 - PR Newswire - Bank of China in the UK Works With IBM to Become a Smarter, Greener Bank... Read
12 Oct 10 - Database Trends and Applications - Informix 11.7: The Beginning of the Next Decade of IBM Informix... Read
20 Sep 10 - - ITG analyst paper: Cost/Benefit case for IBM Informix as compared to Microsoft SQL Server... Read
20 Jul 10 - IBM Announcements - IBM Informix Choice Edition V11.50 helps deploy low-cost scalable and reliable solutions for Apple Macintosh and Microsoft Windows... Read
20 Jul 10 - IBM Announcements - Software withdrawal: Elite Support for Informix Ultimate-C Edition... Read
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17 March 2010 - Virtualization Review - ...key components of Big Blue's platform to the commercial cloud such as its WebSphere suite of application ser vers and its DB2 and Informix databases... Read
10 February 2010 - The Wall Street Journal - International Business Machines is expanding an initiative to win over students and professors on its products. How do they lure the college crowd?... Read

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IDS Forum

Re: Using VMotion to move informix server

Posted By: Art Kagel
Date: Tuesday, 11 June 2013, at 11:54 a.m.

In Response To: Using VMotion to move informix server (S M MAHESH)

The problem is likely that Informix does not initialize the unused portions
of RAW disk chunks that it uses so the unused portion of each RAW chunk is
most likely filled with binary zeroes. The VMotion utility is assuming
normal file behavior and truncating the NULL portion of the chunks when it
creates the mapped files in the VM. Informix tries to write a new page to
what it thinks is an already allocated fixed length file or a certain size
and finds that it gets an EOF error because VMotion truncated the file.
Keep in mind that these kind of physical level disk copies an only be
successfully performed on Informix chunks with the engine either completely
offline or in a blocked state (onmode -c BLOCK)! Here's what you have to

1. Use dd to look at the last "page" of each chunk. If that page is all

NULLs then

- Use dd to write anything to that last page. Since Informix expects

that it contains garbage it will overwrite whatever you put there when it

finally needs to use that space.

2. If it contains data, then LEAVE IT ALONE, this chunk will be OK!

Say you have a chunk that contains 100,000 2K pages, so its size in onstat
-d is 100000, check the last page with:

dd if=/my/chunk/path bs=2k count=1 skip=99999 2>/dev/null | sum

If the page is empty (ie nulls) then the output from sum will look like:
00000 2

The zero checksum is only possible if the page contains no data except
zeros, not even garbage. If you get a non-zero checksum, you may want to
make sure that the page doesn't contain some data but still ends in zero
bytes by piping it to "od -x" instead. Chunks like this should be patched
as well.

Then overwrite the last page:

ls -l | dd of=/my/chunk/path bs=2k count=1 seek=99999

the file destroying your data when it opens it for writing YOU CAN ONLY DO

BEFORE YOU DO ANYTHING LIKE THIS, make sure that you have a viable archive
of the server in hand that's been tested with archecker or by trying to
restore it to another machine.


Art S. Kagel
Advanced DataTools (

Disclaimer: Please keep in mind that my own opinions are my own opinions
and do not reflect on my employer, Advanced DataTools, the IIUG, nor any
other organization with which I am associated either explicitly,
implicitly, or by inference. Neither do those opinions reflect those of
other individuals affiliated with any entity with which I am affiliated nor
those of the entities themselves.

On Tue, Jun 11, 2013 at 11:14 AM, S M MAHESH <> wrote:

> Hi folks,
> We are trying to use VMWare VMotion software to do a physical to virtual
> machine conversion of a box running Informix. Vmotion is a converter tool
> that
> can be used to convert a physical machine to a virtual machine running on
> VM
> ESXi server. We are seeing issues with the dbspace files after converting
> the
> physical box to a virtual one. The dbspace files for one of the chunks is
> running out of disk space (free size is zero post migration).
> The suspicion is that the VMotion tool does not understand the internal
> formats of the dbspaces files. VMotion has issues with "raw disk" files.
> * Has anyone successfully migrated their Informix servers from a physical
> server to ESXi 5.0 VM server using the VMotion tool?
> * Has anyone seen the "dbspace running out of disk space" issue when
> migrating
> from physical to virtual machine? If so, how did you resolve it?
> * What could cause the dbspaces size to grow? Is the size tied to disk
> layout
> of the file?
> * Is there any way (any tool/scripts?) to compact/repack the dbspaces to
> the
> original size?
> Right now, other than the database, the rest of the system is working fine.
> Only the database is problematic because dbspaces reports free size as
> zero.
> Any suggestions/hints/solutions to troubleshoot/resolve the problem will be
> helpful.
> Regards,
> Mahesh
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.


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