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HP-UX 11i Internals by Chris Moore, Chris Cooper

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LVM: The Kernel View

In Figure 11-6 we see an overview of the LVM pseudodriver organization within the kernel. As mentioned earlier, an application thread requests a file open by referencing a file system pathname. The virtual file system resolves this to a specific vnode within the kernel file system table. The vnode contains the device number of the file system on which the file is located. The device number for LVM-based file systems directs all I/O requests to the LVM pseudodriver via the kernel's device switch table. Once an I/O request is received by the driver, the driver must pass it through several layers.

Strategy Layer: This layer receives the initial request for a block I/O transaction to a specific file system block. The kernel facilitates ...

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