I learnt yesterday that I could pvcreate directly on /dev/sdb instead of /dev/sdb1. I thought that you could only pvcreate on a existing partition. Doing it on a partition adds a level and operations so what are the benefits of creating a partition before doing pvcreate?
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1Related question: Uses of single-partition disk configuration. – Kamil Maciorowski Jun 28 '17 at 08:11
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2Actually there's another reason, and simply rephrasing this answer isn't useful to anyone. Directly creating the partition interferes with resizing the volumes. – Thomas Dickey Jun 28 '17 at 08:14
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There are two reasons to do so.
If the partition does not allocate 100% of the space of the device, this allows you to assign only a part of the device to LVM, hence leaving the rest of the device available for other uses.
In the case of a partition allocating all the device space, the reason is that if the disk is accessed by other non-Linux OSes, they might not recognize LVM and see the unpartitioned disk as a clean slate. Making a partition on it signals that the disk is being used for something.
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