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I'm about to set up a new nas and basically want to know if it's a bad or a good idea to have one lvm volume on multiple mirrored mdadm arrays, kind of like raid 10. I thought this would make it easier to expand the volume by just adding a new raid1 array to the volume. Is this smart or should I just go with plain mdadm?

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The up side to using lvm this way is that it does make expanding easy and the new drives don't have to be the same size. On the other hand, a 4 disk mdadm raid10 configured to use the offset striping mode can give seqential read performance near that of a 4 disk raid0, but an lvm stripe on top of two mdadm raid1s only has the performance of two disks.

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