The lvchange option '-a n' or '--alloc none' is used to change the allocation policy for a logical volume to 'none', preventing further extents from being allocated to the volume. This option would be used in advanced scenarios such as maintenance or to prevent changes to a volume while taking a snapshot. The other listed options do not relate to the allocation policy and serve different purposes within the lvchange command.
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What are physical extents in the context of logical volumes?
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What does the `-a n` option in LV change and when might it be used?
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What are snapshots in LVM, and how do they relate to the lvchange command?