Having learned a bit about LVM mirroring, I thought about replacing the current RAID-1 scheme I'm using to gain some flexibility.
Problem is that according to what I found on the Internet, LVM is:
- Slower then RAID-1, at least in reading (as only single volume being used for reading).
- Non-reliable on power interrupts, and requires disk cache disabling for prevention of data loss.
Also it seems, at least to several setup guides I read (http://www.tcpdump.com/kb/os/linux/lvm-mirroring/intro.html), that one actually requires a 3rd disk for storing the LVM log. This makes the setup completely unusable on 2 disks installations, and lowers the amount of used mirror disks on higher amount of disks.
Can anyone comment the above facts, and let me know his experience of using LVM mirroring?