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On Fri, 08 Apr 2011 15:50:03 +0200, Dale wrote about Re: [gentoo-user] |
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LVM for data drives but not the OS: |
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|
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[snip] |
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>Ooooh. Still some progress tho. lol So, if I was going to use LVM, |
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>I create a partition first, either whole drive or part of it then use |
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>LVM on that? |
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|
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You use pvcreate to create a physical volume from the partition; this |
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formats the partition for LVM use, rather than for a filesystem. When |
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you have enough physical volumes on enough disks -- it's usually one |
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large PV per disk -- you then use vgcreate to amalgamate those physical |
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volumes into a volume group. You can then use lvcreate to allocate |
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logical volumes within that volume group. |
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|
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After that, you use mkfs to format each logical volume, as if it were a |
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partition. You can then add them to /etc/fstab and mount them as |
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needed. |
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|
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Note that the amalgamation of physical volumes into a volume group |
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allows you to do some neat things: you can "stripe" a logical volume |
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across multiple physical volumes to improve its I/O bandwidth; your |
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volume group is what DASD managers call a "concatenation set", which |
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means its effective size is the sum of the physical volume sizes, so |
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you can create a logical volume that is bigger than any of the physical |
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volumes involved. |
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|
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But before you do any of that fancy stuff, get used to using LVM2 as a |
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smarter partition manager. |
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-- |
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Regards, |
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|
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Dave [RLU #314465] |
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dwnoon@××××××××.com (David W Noon) |
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