lvm mirror or mdadm mirror or raid 5

Hi

I have a machine with 3 sata drives. Currently i have

raid 1 /
raid 1 /boot
raid 5 - pv

I have been looking at why not to raid 5 and I would go to raid 10 but I can only put 3 drives in my machine.

Currently have 3x250G and am looking at getting 3x500G, if I go to mdadm raid1, then I have 500G safe 500G unsafe which is not really what I want.

I am going to stick with the /, /boot raid1 sets.

But I was thinking about setting up the rest of the space as pv's and them using lvm's dm-mirror to manage the mirroring of space ? then if I don't want any redundancy on my space I can lvcreate without dm-mirror.

Any one doing this, I haven't had much experience with dm-mirror.

Do you need help?

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my thoughts were

1 big vgroup
and lots of lv's some with mirrors and some without ?

Alex

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