Re: mdadm raid5 with lvm: advantages?

[Zdenek Kaspar <zkaspar82@gmail.com>]

Dne 11.1.2011 15:06, Richard Grundy napsal(a):
> Hi,
> 
> I'm building a new RAID5 array (of 5 1.5 TB drives) with mdadm and
> would like to know the benefits of creating an LVM on top of this are
> instead of just creating the filesystem on the md directly. I've never
> had a problem growing the array and then resizing the filesystem
> before and wondered if in this situation the only gain would be lvm
> snapshot stuff? I'm planning to use ext4 for this array, if that makes
> any difference.
> 
> Thanks in advanced,
> 
> Rich
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Really depends on your needs..

It makes sense to use LVM for virtualization and iSCSI to get rid of big
file images (unwanted fs overhead/fragmentation). But yes, in some use
cases this is OK.

If you don't need snapshots or whatever LVM feature, then go the
simplest way - no LVM.

HTH, Z.