Windows Disk Fragmentation

  • 17 Feb, 2010

Last Saturday i scheduled an maintenance for one of the our Domino Server. The server performance was not great and the problem was related to I/O.
Using Defraggler the analysis show us that the disk was 98% fragmented. After 3 hours, with Domino out of service, the disk was defragmented and the analysis show us 1% fragmented.
So i see a lot of databases with ODS 43, very old, and then i start a compact -c for all databases.
I ran Defraggler again and the analysis show than 58% of fragmentation, compact -c fragments databases.

Today at OpenNtf there is an article about DominoDefrag, the solution to my problem, i don’t have the maintenance  window.
DominoDefrag can defrag t databases online, and it works great !

No último sábado programamos uma manutenção em um de nossos servidores devido a problemas de performance, claramente I/O.
O diagnóstico preliminar foi o disco muito fragmentado. Inciamos a desfragmentação parando o Domino e usando o programa Defraggler.
O disco estava 98% fragmentado. Após 3 horas de operação o disco ficou com 1% fragmentado, nada mal.
Porém observei que alguns bancos de dados estavam com o ODS na versão 43, resolvi então compactar todas as bases para que ficassem com o ODS 48 (R8).
O comando para converter o ODS é compact -c.
Até aqui tudo normal e funcionando. Só que li um artigo em alguns blogs informando que o compact  -c desfragmenta o disco.
Olhei novamente o disco e estava fragmentado novamente 59%. Desta vez o problema era pior pois não tinha mais janela para manutenção.
Encontrei então o projeto DominoDefrag no OpenNtf que resolveu o problema desfragmentando o disco com o Domino ativo.

Look at the figures bellow, DominoDefrag works !
Vejam como realmente o DominoDefrag funciona !

Before DominoDefrag
Antes do DominoDefrag

Image:Windows Disk Fragmentation

After DominoDefrag
Depois do Domino Defrag.

Image:Windows Disk Fragmentation

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