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Fedora and LVMFedora and LVMPosted Nov 2, 2012 16:13 UTC (Fri) by Tobu (subscriber, #24111)In reply to: Fedora and LVM by Cato Parent article: Fedora and LVM A LiveCD isn't just easier, it's necessary to be able to unmount partitions that are normally in use. More importantly, step 4 will take a long time and leave you with a thrashed filesystem if an interruption occurs. This is not user-friendly.
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Fedora and LVM Posted Nov 2, 2012 16:27 UTC (Fri) by Cato (subscriber, #7643) [Link]
I'm aware of why using a live CD is sometimes necessary, didn't think that was essential to mention on LWN.
LVM on older kernels (< 2.6.33) that don't fully support write barriers is also rather dangerous for everyday operations, not just filesystem moves/resizes, unless you turn off write caching in the hard drive (long story, search for "lvm risks" in google).
So whether you use LVM or Gparted, you need to ensure your machine doesn't crash, that the moving-stuff-around app doesn't crash (pvmove has been known to cause data loss due to lack of RAM, see my comments elsewhere).
LVM is somewhat safer if you have a good UPS and have correctly configured write barriers and write caches, but since I use UPSes for my PCs and have yet to had a PSU failure or machine crash during a Gparted operation, I'm happy that the risk is quite low.
In fact the one time I lost data with GParted was when not using a live CD - the rather old kernel + Gparted versions meant that the partition table wasn't properly updated and I omitted to reboot. So a live CD is definitely the way to go.
Whatever method you use, you really need to do a full backup anyway, which guards against the sorts of data-loss mentioned here. So it comes down to speed, ease of use, reliability, etc.
Fedora and LVM Posted Nov 2, 2012 21:50 UTC (Fri) by Tobu (subscriber, #24111) [Link] I'm aware of why using a live CD is sometimes necessary, didn't think that was essential to mention on LWN.I mean, with LVM I don't need to bother with bootable media. I wanted to highlight this difference (this FESCO spat brought up the petty in me, sigh).
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