Originally posted by SkyHiRider
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The biggest reason to use LVM is convenience and easiness, when moving stuff around or resizing things. No mucking around with repartitioning or having to reboot to re-read partition tables. Your system just magically stays running as though no one had ever pulled the rug out from beneath your filesystem. It's actually pretty damn cool. But it's only useful if you're anticipating changing things. If "casual user" means you're just divvying up one disk (or raided md) into a swap and root partition, then LVM might be overkill.
The disabled write barrier risks (or lack thereof) (or controversy about "lack thereof") (or controversy about that supposed controversy) are discussed here. IMHO if you're using a UPS you can blow it off and not worry about write barriers. You're going to lose your data to user errors or simply due to using less-than-decade-debugged filesystems like ext4 or btrfs, long before write barriers are a factor. Again, IMHO.
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