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    Fault tolerant locking for shared disk filesystems

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    T05496.pdf (31.91Mb)
    Author
    Gautham, L
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    Abstract
    Shared disk filesystems are essential for enabling direct, high-performance access over block-based Storage Area Networks (SANs). A critical component of such systems is the distributed lock manager, which ensures synchronized access to data and metadata across multiple hosts. To enhance system availability, this work presents a fault-tolerant, multicast-based lock manager for the open-source GFS filesystem on Linux, which currently lacks such a mechanism. The proposed protocol minimizes network hops during lock acquisition, which is particularly beneficial when transferring dirty data over the network instead of performing disk writes. It leverages a group communication toolkit to ensure ordered message delivery and failure handling. A group communication system (GCS) was ported to the kernel to support this functionality, simplifying the protocol’s design and implementation. Performance evaluations on a Fibre Channel SAN setup demonstrate that the fault-tolerant system performs comparably to the existing non-fault-tolerant solution, validating its effectiveness.
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    https://etd.iisc.ac.in/handle/2005/7149
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    • Computer Science and Automation (CSA) [442]

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