VxVM and the operating system
VxVM operates as a subsystem between your operating system and your data management systems, such as file systems and database management systems. VxVM is tightly coupled with the operating system. Before a disk can be brought under VxVM control, the disk must be accessible through the operating system device interface. VxVM is layered on top of the operating system interface services, and is dependent upon how the operating system accesses physical disks.
VxVM is dependent upon the operating system for the following functionality:
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operating system (disk) devices
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device handles
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VxVM dynamic multipathing (DMP) metadevice
VxVM relies on the following constantly-running daemons and kernel threads for its operation:
vxconfigd
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The VxVM configuration daemon maintains disk and group configurations and communicates configuration changes to the kernel, and modifies configuration information stored on disks.
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vxiod
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VxVM I/O kernel threads provide extended I/O operations without blocking calling processes. By default, 16 I/O threads are started at boot time, and at least one I/O thread must continue to run at all times.
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vxrelocd
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The hot-relocation daemon monitors VxVM for events that affect redundancy, and performs hot-relocation to restore redundancy.
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