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  1. #1
    Neckratal
    Visitante

    Padrão Alguem usa o Unison

    Ae pessoal blz?

    Alguem ja usou o unison para fazer o cluster???

    Qual a vantagem dele comparado com o DRDB???

    Obrigado

  2. #2

    Padrão Alguem usa o Unison

    Unison shares a number of features with tools such as configuration management packages (CVS, PRCS, etc.), distributed filesystems (Coda, etc.), uni-directional mirroring utilities (rsync, etc.), and other synchronizers (Intellisync, Reconcile, etc). However, there are several points where it differs:

    * Unison runs on both Windows (95, 98, NT, and 2k) and Unix (Solaris, Linux, etc.) systems. Moreover, Unison works across platforms, allowing you to synchronize a Windows laptop with a Unix server, for example.
    * Unlike a distributed filesystem, Unison is a user-level program: there is no need to hack (or own!) the kernel, or to have superuser privileges on either host.
    * Unlike simple mirroring or backup utilities, Unison can deal with updates to both replicas of a distributed directory structure. Updates that do not conflict are propagated automatically. Conflicting updates are detected and displayed.
    * Unison works between any pair of machines connected to the internet, communicating over either a direct socket link or tunneling over an rsh or an encrypted ssh connection. It is careful with network bandwidth, and runs well over slow links such as PPP connections. Transfers of small updates to large files are optimized using a compression protocol similar to rsync.
    * Unison has a clear and precise specification.
    * Unison is resilient to failure. It is careful to leave the replicas and its own private structures in a sensible state at all times, even in case of abnormal termination or communication failures.
    * Unison is free; full source code is available under the GNU Public License.



  3. #3
    Neckratal
    Visitante

    Padrão Alguem usa o Unison

    Pintaga, entaum é um boa usa-lo para HA? ou o DRDB é melhor??

    Valeu :arrow:

  4. #4

    Padrão Alguem usa o Unison

    Depende dos objetivos, ele ao meu ver substituiria o rsync, scp... e outros sincronizadores... ele atua no nível de arquivos visto que o DRBD trabalha no nível de bloco e em tempo real, de forma síncrona ("protocolo A") e forma assíncrona (protocolo B e C).

    Permite a interoperabilidade entre plataformas de SOs diferentes, uma grande vantagem, para backup por exemplo de SGBDs.

    Um excelente recurso para recuperação de desastres devido sua facilidade e boa performance em links de baixa velocidade por meio de compressão, estilo rsync.

    Mas ele ainda é unidirecional, e o DRBD é bidirecional....