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So I have a 16tb raid6 on one of a new batch of machines I am setting up. I will be using LVM on top of this and am wondering if there are any compelling reasons to break the raid up into partitions first or any compelling reasons not to.

I know that if I want to use different volume groups in lvm I'll need different physical volumes... but I don't know if that really matters a whole lot here.

The OS is installed on a separate 2tb raid1.

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up vote 1 down vote accepted

No, one big partition will do just fine and most accurately represent the underlying disk to LVM.

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Thanks, that's kind of the direction I was leaning but could not find anything written on the subject. – allaryin May 24 '12 at 17:51

Your limitation comes from the filesystem, if you are putting ext4 on it, you'll be fine, as the largest filesystem that can cope with is 16 TiB

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He's using LVM, so the decision as to how large to make the filesystems is independent of how to partition the LUN. – MikeyB May 24 '12 at 17:41
There is no limitation on the LUN sizes, there is limitations on filesystem sizes, presumable the LUNs will be used to host filesystems at some point. – Sirch May 25 '12 at 8:16

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