I think there are some conceptual issues that you should understand and I do not feel you are clear on them yet. (Or maybe I am the one not clear)
First of all, there is no "last 50Gb" on a LLV scheme. When you create and use LLV, you are surrendering disk management to the LLV manager in exchange of the flexibility it provides handling the disk. Whatever data you send to the LLV volume, the manager will place where it feels most convenient.
Second, if you want a 50G "partition" you need to create a second volume group to hold those backups, separate from the main volume. Again, there is no guarantee of where in the disk this data would reside unless you first created a 50GB partition at the end of the drive, and created a volume in there with vgcreate and added it to the physical volume, but geese, that sounds like all the work we were originally trying to avoid :-)
Finally, are you taking into consideration that whatever managed to trash your filesystem under LLV will most likely trash your backups if they are under the same LLV structure?
My 2 cents
On Mon, Aug 19, 2013 at 10:59:46PM +0200, Mateusz Marzantowicz wrote:
> pvscan, pvscreate, vgscan, vgcreate, lvscan, lvcreate
These days, vgcreate followed by lvcreate is sufficient.
- vgcreate automatically performs pvcreate if it needs to
- scans shouldn't normally be needed
Alasdair
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