Join IIUG
 for   
 

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
10 Aug 12 - businessCLOUD9 - Is this the other half of Cloud monitoring?... Read
3 Aug 12 - IBM data management - Supercharging the data warehouse while keeping costs down IBM Informix Warehouse Accelerator (IWA) delivers superior performance for in-memory analytics processing... Read
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 - BernieSpang.com - 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
1 Mar 12 - IBM Data Management - Running Informix on Solid-State Drives.Speed Up Database Access... Read
26 Feb 12 - BernieSpan.com - Better results, lower cost for a broad set of new IBM clients and partners... Read
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
1 Feb 12 - developerWorks - 100 Tech Tips, #47: Log-in to Fix Central... Read
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 - planetIDS.com - DNS impact on Informix / Impacto do DNS no Informix... Read
8 Sep 11 - TMCnet.com - 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
2 Feb 11 - DBTAs - Informix 11.7 Flexible Grid Provides a Different Way of Looking at Database Servers... Read
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 - planetIDS.com - 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
24 May 10 - eWeek Europe - IBM Supplies Database Tech For EU Smart Grid... Read
23 May 10 - SiliconIndia - IBM's smart metering system allows wise use of energy... Read
21 May 10 - CNET - IBM to help people monitor energy use... Read
20 May 10 - ebiz - IBM Teams With Hildebrand To Bring Smart Metering To Homes Across Britain... Read
19 May 10 - The New Blog Times - Misurare il consumo energetico: DEHEMS è pronto... Read
19 May 10 - ZDNet - IBM software in your home? Pact enables five-city smart meter pilot in Europe... Read
17 March 10 - ZDNet (blog) David Morgenstern - TCO: New research finds Macs in the enterprise easier, cheaper to manage than... Read
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


End of Support Dates

IIUG on Facebook IIUG on Twitter

[ View Thread ] [ Post Response ] [ Return to Index ] [ Read Prev Msg ] [ Read Next Msg ]

IDS Forum

RE: Are there issues when using RAW dbspaces o....

Posted By: Wyza, Jonathon
Date: Thursday, 29 July 2010, at 10:34 a.m.

In Response To: RE: Are there issues when using RAW dbspaces o.... (jim-cramer@uiowa.edu)

I was unaware there was more than 1 lv manager in SLES 11. I just used the one in YaST2 under System->partitioner (which contains both a LVM and a standard disc partitioner).

In my case I didn't use sym links for my chunks I used mknod to create nodes to the device files, so I can't comment on if that will work or not. (this was the recommendation of our software provider).

Jonathon Wyza
CX & CBORD System Administrator
CX Programmer/Analyst
Administrative Computing
Bethel College
(574)-257-3381
AIM: Iamwyza
jonathon.wyza@bethelcollege.edu
==============================
SLES 11x64 & IDS 11.50.FC6

"Don't document the problem, fix it."
- Atli Björgvin Oddsson

-----Original Message-----
From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of jim-cramer@uiowa.edu
Sent: Thursday, July 29, 2010 9:55 AM
To: ids@iiug.org
Subject: RE: Are there issues when using RAW dbspaces o.... [20685]

Hi again Jonathon,

It is my understanding that SUSE Linux comes with more than
1 Logical Volume Manager.

If this is the case, can you tell me which one the concern that you mention below applies to?

Also, one of our Sys Admins told me that at least one of the LVMs on Linux has a built-in mechanism that I could take advantage of to avoid the pitfall that you mention. The mechanism apparently involves a couple levels of symbolic links for each device file.
He says that the system will dynamically change the lowest level link for a device file at times, but that it will also update a higher level link, whose name/path never changes, for the same device to reflect the change in the underlying link. In other words, if I used the highest level link for a device file in my creation of a db chunk, the pitfall you mention would be avoided.

I don't know if this mechanism that he told me about applied to all Logical Volume Managers provide with SUSE and will check with him on that.

In the mean time, it would be useful if you could tell me the name of the LVM that you know the situation you described happens with.

Thanks,

Jim

-----Original Message-----
From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of Wyza, Jonathon
Sent: Wednesday, July 28, 2010 10:21 AM
To: ids@iiug.org
Subject: RE: Are there issues when using RAW dbspaces o.... [20675]

There is a problem with the way that linux handles logical volumes with informix. But it is easily fixable. By default the major/minor numbers for the logical volume devices are assigned dynamically at boot. Because of this your chunks could move, but informix wouldn't know where they went. You can set the volumes to have static device numbers to fix that problem. Again, they don't have to do ANYTHING.....

By and by the command would be something like this:

lvchange -M --major # --minor # "/dev/mapper/lg-lgname-lv-lvname"

Jonathon Wyza
CX & CBORD System Administrator
CX Programmer/Analyst
Administrative Computing
Bethel College
(574)-257-3381
AIM: Iamwyza
jonathon.wyza@bethelcollege.edu
==============================
SLES 11x64 & IDS 11.50.FC6

"Don't document the problem, fix it."
- Atli Björgvin Oddsson

-----Original Message-----
From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of jim-cramer@uiowa.edu
Sent: Wednesday, July 28, 2010 11:15 AM
To: ids@iiug.org
Subject: RE: Are there issues when using RAW dbspaces o.... [20673]

Jonathon,

Thank you very much for the fast response and the below info.

At 2 pm I had to do battle with the Sys Admins here and your information, as well as what Art has been saying all last week (and previous to that) about Raw db chunks and issues, helped me argue my case.

As far as what I said and was worried about in issue (1) goes, either I misunderstand what was rattled off to me this morning in a hurry about that or they have changed their tune.

After talking to them, I was pretty sure that the admins, or perhaps just one of them, were claiming that there could be issues with the ESX server management/system software/ utilities affecting the raw db chunks in the VMs that my Informix instances are in. You are right, that makes
0 sense. I thought so too at the time, but perhaps I misunderstood.
Because
now they are saying that their concern is that Linux system management stuff, such as YAST, within the VMs that my Informix instances are in could mess with my raw logical volumes used as Informix chunks. They said that they have to configure some things inside the VMs so that they do not do that.

I have no Linux Sys Admin experience, just HP-UX.
If you are aware of anything that is part of Linux that might be a consideration when I use raw logical volumes, please let me know if you get a chance.

Thanks again for your help!

Jim

-----Original Message-----
From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of Wyza, Jonathon
Sent: Tuesday, July 27, 2010 2:23 PM
To: ids@iiug.org
Subject: RE: Are there issues when using RAW dbspaces o.... [20663]

1) That makes 0 sense. Although you will be using raw spaces, the drives themselves are allocated by the host for the client to use in any way it sees fit, just have them allocate the space on drive creation instead of when it needs it (just so you have sequential sectors on the discs). Raw spaces will

work fine in a virtual environment.
2) Backing it up using their utility is silly. Use ontap or onbar.
3) Little bit? try at least 20% increase. And what sys admin overhead are they talking about?
4) JFS is exactly why you DON"T want cooked files. look at the thread about performance issue with ZFS on this board just this week to see a nice long

explanation by Art about this.

Jonathon Wyza
CX & CBORD System Administrator
CX Programmer/Analyst
Administrative Computing
Bethel College
(574)-257-3381
AIM: Iamwyza
jonathon.wyza@bethelcollege.edu
==============================
SLES 11x64 & IDS 11.50.FC6

"Don't document the problem, fix it."
- Atli Björgvin Oddsson

________________________________________
From: ids-bounces@iiug.org [ids-bounces@iiug.org] on behalf of Jim Cramer [jim-cramer@uiowa.edu]
Sent: Tuesday, July 27, 2010 3:14 PM
To: ids@iiug.org
Subject: Are there issues when using RAW dbspaces on ID.... [20662]

HELP!

Here is another angle to the recent questions, and explanations by Art, et.
al, regarding using RAW instead of COOKED dbspaces on IDS 11.5 running on Linux.

For reasons cited by Art and the others, I (the DBA) wish to use RAW dbspaces when I move my instances to Linux (SUSE 11 SLES) Virtual Machines on an ESX Server running VMWare.

But my Sys Admins here are refusing to allow RAW spaces and citing all kinds of vague, generalized reasons why, such as:

1) the "host administration utilities" will not fly right with Raw Spaces but will not be specific about what would go wrong. In general, my sense is that they feel that the Management Console and Tools for the ESX host might see the Raw Dbspace and, because it does not contain not a formatted filesystem, allocate it to something on the box.

2) using raw space will not allow the VMs containing the IDS dbspaces to be backed up or fit into their backup strategy and backup utility.

They cannot seem to understand that a normal backup utility would not know how to deal with the dbspaces even if they were Cooked.

3) that the "little bit" of performance that they claim I might get with Raw will not pay back for the increased Sys Admin overhead.

4) that they will use a Journaled File System (along with Cooked
dbspaces) because it is more robust, fault-tolerant, comes back up quicker

after a crash, etc.

Can anybody provide me with any concrete information/experience that is related to the above points, particularly (1) .

Does anyone know if raw dbspaces can cause problems in a Virtual Machine on a VMWare ESX Server.

If you have some info and have time to send it soon, that would be appreciated because I am about to do battle over this with our Sys Admins.

Thanks much in advance,

Jim Cramer
Database Administrator and
Applications Developer III
University of Iowa
College of Engineering
Engineering Computer Systems Support
1256 SC
Iowa City, Iowa 52245
(319)-335-5757
jim-cramer@uiowa.edu
jcramer@engineering.uiowa.edu
http://css.engineering.uiowa.edu
http://www.engineering.uiowa.edu
http://www.uiowa.edu

**************************************************************************
**
***
Forum Note: Use "Reply" to post a response in the discussion forum.

**************************************************************************
**
***
Forum Note: Use "Reply" to post a response in the discussion forum.

**************************************************************************
*****
Forum Note: Use "Reply" to post a response in the discussion forum.

**************************************************************************
*****
Forum Note: Use "Reply" to post a response in the discussion forum.

*******************************************************************************
Forum Note: Use "Reply" to post a response in the discussion forum.

Messages In This Thread

[ View Thread ] [ Post Response ] [ Return to Index ] [ Read Prev Msg ] [ Read Next Msg ]

IDS Forum is maintained by Administrator with WebBBS 5.12.