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  1. #1
    Just Joined!
    Join Date
    Aug 2007

    clustering with a shared disk

    i was arguing with some fellows if the following is a good practice for a cluster :
    1. 2 application servers accessing a shared disk.
    2. load balancing for the 2 servers done through DNS ( not so clear how !).

    but the main point is #1, in my opinion - i'm not a cluster'aholic , i know very little - i think that the bottleneck this way is moving from the NIC and server resources to the disk which is even worse as it acts as a single dangerous point of failure.

    I'm waiting to hear some other opinions on this matter.

  2. #2
    Linux Enthusiast likwid's Avatar
    Join Date
    Dec 2006
    Normally, this is done with high-speed dedicated links- like fiber, that isn't used for anything but connection to the SAN. A disk inside a server is a single dangerous point of failure- having a SAN box normally comes with a bunch of network interfaces, and all sorts of redundancy and fault tolerance. This is one of the most common setups in clustering.

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