Norberto Bensa wrote:
Quoting Josh Cepek <[EMAIL PROTECTED]>:3) You can easily migrate between hard drives while the system is online by moving LV's from one Physical Volume (PV) (eg: a hard disk) to another.--!!Have you ever tried that? I've almost killed both hard drives doing an on-line migration to a bigger HD. I wouldn't recommend it.
Actually, yes, and with fairly decent results. You are right that his process will take quite a while on large LV's, and doing other disk-intensive operations at the same time will bring the system to a crawl. However, I used this technique to remove an old NTFS partition when I migrated to a VM for my Windows system.
To recover the space into a single larger PV (a single PV was important for me here) I attached an external USB 2.0 drive, created a PV, and added it to my pre-existing VG. I then pvmove-ed the data over to the external drive, removed the old partitions, and re-created a single larger partition on the internal drive. Once the LV's were migrated back I removed the PV on the external drive.
In my case I also moved my non-LVM root partition to the end of the drive after the migration to the external drive, but had I not needed to do this I could have performed the entire operation without needing to even reboot.
All in all I think this example demonstrates the utter flexibility you get with LVM. I leave it up to each user to determine where flexibility ends and insanity takes over ;)
-- Josh
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