359 Lotus blogs updated hourly. Who will post next? Home | Downloads | Events | Pods | Blogs | Search | myPL | About 
 
Latest 7 Posts
Flashback Friday -> How to use the Cluster Analysis tool to run a Cluster Analysis and spot problems
Thu, Oct 9th 2014 146
Who out there is using DBMT ?
Thu, Oct 9th 2014 195
DBMT compact optimization in action.
Fri, Aug 29th 2014 250
How to make DBMT 50%+ more efficient
Thu, Aug 28th 2014 306
Flashback Friday: Compact -c and fragmentation
Thu, Aug 21st 2014 220
Anyone know what happened to Project Hawthorn ?
Tue, Aug 5th 2014 546
IBM brings in the wrong Ed !!
Wed, Jul 23rd 2014 475
Top 10
Anyone know what happened to Project Hawthorn ?
Tue, Aug 5th 2014 546
IBM brings in the wrong Ed !!
Wed, Jul 23rd 2014 475
Busting a DBMT pre-allocation Myth
Thu, Jul 10th 2014 324
The ID Vault may not be doing what you think it is !
Fri, May 27th 2011 310
How to make DBMT 50%+ more efficient
Thu, Aug 28th 2014 306
No Auslug this year - from one of the Best to a non-event in three years.
Wed, Jul 23rd 2014 300
DBMT compact optimization in action.
Fri, Aug 29th 2014 250
Flashback Friday: Compact -c and fragmentation
Thu, Aug 21st 2014 220
Has anyone else noticed the information vacuum on Notes and Domino created by Ed's departure a year ago ?
Thu, Jan 23rd 2014 206
Who out there is using DBMT ?
Thu, Oct 9th 2014 195


Not all defragging engines are equal
   

I've written about this before, but it has come up a couple of times this week - Not all defraggers are the same.
 
Some are free, some cost money, some have very intelligent algorithms, some aren't so good. Tweaking and optimising a defragging algorithm takes time. Time typically has a cost associated with it.
 
One thing we've learnt over the last three years is that Domino places some rather unique requirements on a defragmention algorithm. The following rules seem to always apply:
  • the longer the server has been running, the worse state it is in.
  • available freespace is likely to be highly fragmented.
  • it is not unusual to have highly fragmented multi gigabyte database. As a rule, multi gigabyte files (30GB+) outside of Domino are fairly uncommon.
  • it is difficult to defrag files that are constantly changing.
In an environment where you have a lot of small databases with a lot of disk space available, the job of a defrag engine is rather easy.
 
As you move up the scale, and enter the real world of Domino it gets harder and harder, and the algorithm used by the defrag engine needs to be smarter.
 
I've been asked a number of times, why not just use the 'Free stuff'. Free defragging products typical are:
  • not designed from the ground-up to meet the needs I outlined above.
  • perform relatively simple cluster moves.
  • do not handle multi-gigabyte, constaintly changing files very well.
  • are a simple wrapper around a freeware utility that falls in one of the categories above.
I'm not saying they are bad, or don't work, but what I will say is this - developing a Domino specific defragging engine has been challenging, very time consuming and costly.
 
Which brings up a well known idiom, "You get what you pay for"
 
Given all this, we are please to announce the availability of Defrag.NSF version 2.06. We have done a significant amount of fine-tuning to the defragging engines for this update and we are excited about the results we're obtaining.
 
Put Defrag.NSF to work on your servers today with a 30 day, supported Free Trial and see for yourself. Register here


---------------------
http://ab1osborne.blogspot.com/2011/03/not-all-defragging-engines-are-equal.html
Mar 31, 2011
19 hits



Recent Blog Posts
146


Flashback Friday -> How to use the Cluster Analysis tool to run a Cluster Analysis and spot problems
Thu, Oct 9th 2014 11:25p   Adam Osborne
From Thursday, August 9, 2012 - > How to - Use the Cluster Analysis tool to run a Cluster Analysis and spot problems [read] Keywords:
195


Who out there is using DBMT ?
Thu, Oct 9th 2014 11:05p   Adam Osborne
The latest build of Defrag.NSF includes a new feature that can dramatically cut down the amount of work DBMT does, you can read all about it here and here. When working on this feature we did wonder one thing, Who out there is using DBMT ? Please take a moment to answer our poll on the right. We will share the answers when they come in. [read] Keywords:
250


DBMT compact optimization in action.
Fri, Aug 29th 2014 12:45a   Adam Osborne
Here is a video showing the new DBMT compact optimization in action. Let us know if you've got any questions. We hope you like it. [read] Keywords:
306


How to make DBMT 50%+ more efficient
Thu, Aug 28th 2014 12:05a   Adam Osborne
DBMT is a wonderful new feature in Domino 9, but it has a nasty habit of doing more work than it needs to. Our tests show that it can spend a considerable amount of time compacting databases that just DON'T need to be compacted. Even if there is no space to recover in a given database DBMT will still compact it according to the -compactNdays setting. In production this could equate to a huge number of databases and possibly hours of processing. Why do all the work of manufacturing new "copie [read] Keywords: domino ibm database server
220


Flashback Friday: Compact -c and fragmentation
Thu, Aug 21st 2014 10:45p   Adam Osborne
Each Friday we going to present some of our older blog postings that covers a topic that we still get questions on. In this week's flashback we are going to look at compact -c and how it fragments databases. Remember that under the covers DBMT does a compact -c Enjoy http://www.preemptive.com.au/files/NewCompact.html [read] Keywords:
546


Anyone know what happened to Project Hawthorn ?
Tue, Aug 5th 2014 12:05a   Adam Osborne
I've been looking but haven't heard Boo about this for months ? Is it dead ? Does anyone know ? [read] Keywords:
475


IBM brings in the wrong Ed !!
Wed, Jul 23rd 2014 9:05p   Adam Osborne
I thought we wanted Ed Brill back not Connect - Ed !!! [read] Keywords: ibm
300


No Auslug this year - from one of the Best to a non-event in three years.
Wed, Jul 23rd 2014 9:05p   Adam Osborne
It was rather sad to hear today that there will be no Auslug this year. I'm not sure why but my best guess is the ecosystem that was IBM Lotus in Australia is now so ill that a free event just can't be supported. I've written about this previously. As previously mentioned, the people that try to organise these events do an amazing job but it all comes at a cost. They need vendor support and vendors need customer who are willing to buy stuff. The committee is trying to put together an even [read] Keywords: ibm inotes lotus




324


Busting a DBMT pre-allocation Myth
Thu, Jul 10th 2014 9:05p   Adam Osborne
Some say you no longer need to worry about fragmenation now DBMT has a new pre-allocation feature - sorry that's not the case. Let me explain: DBMT uses copy style compacts when it's reorganizing a target database. We've written numerous times about how copy style compacts have a nasty fragmentation side-effect. See here and here and here. IBM must of been listening to us because they attempted to address this with new pre-allocation functionality in Domino 9.0.1. The concept is that DBMT [read] Keywords: domino ibm database
152


New Business Partner BlazinglyObvious to release xPages Connections clone.
Mon, Mar 31st 2014 7:05p   Adam Osborne
New business partner "BlazinglyObvious", located in McMurdo Antarctica has decided to release Domino xPages applications that are functionally identical to IBM's Connections product. During the product announcement their CEO, Captain Obvious said "We've spoken to numerous Connections customers and they've told us that they're having trouble installing the product. Apparently the process of downloading 10's of GBs of files, patches and cumulative updates for multiple disparate products, [read] Keywords: admin connections domino ibm notes xpages application applications server




Created and Maintained by Yancy Lent - About - Blog Submission - Suggestions - Change Log - Blog Widget - Advertising - Mobile Edition