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Fedora and LVMFedora and LVMPosted Nov 1, 2012 0:31 UTC (Thu) by marcH (subscriber, #57642)In reply to: Fedora and LVM by mezcalero Parent article: Fedora and LVM
While I use and like LVM on "normal" disks, I really never expected anyone would try to use it on removables or on top of iSCSI... What are the use cases here?
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Fedora and LVM Posted Nov 1, 2012 1:25 UTC (Thu) by Cyberax (✭ supporter ✭, #52523) [Link]
Using an external USB drive to temporarily expand a small internal SSD?
Fedora and LVM Posted Nov 1, 2012 14:02 UTC (Thu) by TRS-80 (subscriber, #1804) [Link] Proxmox VE uses it to store virtual machine images, which it can then LVM snapshot for crash-consistent backups while the VM is running. Being a VM hypervisor, iSCSI is a natural choice to allow shared storage and migration between hosts. I have it running at work and it's pretty awesome.
Fedora and LVM Posted Nov 2, 2012 19:06 UTC (Fri) by phiggins (subscriber, #5605) [Link]
I used to run Fedora as my primary OS on my work laptop. I resized the Windows partition down but didn't remove it, and that left me with little space to actually work in. I put /home on a USB drive and used LVM. It was a huge mistake for exactly the reasons mentioned. It rarely was mounted automatically and caused big problems (I don't remember exactly what they were now) whenever the USB cable accidentally became disconnected.
I honestly can't remember why I used LVM in the first place, but Fedora using it by default probably influenced that decision.
I used to be in the "LVM is worthless confusing overhead for a desktop and even small servers" camp. Now that I have more experience with it after using it for years *because* Fedora made it the default, I have found its features useful a few times per year. However, I am still nervous that one day I will be unable to recover my data because LVM is too complicated and I won't know how to restore a non-booting system.
Fedora and LVM Posted Nov 2, 2012 20:39 UTC (Fri) by nix (subscriber, #2304) [Link]
One saving grace of LVM is that the metadata backups are not just kept in /etc/lvm. They are *also* kept in a defined place on every PV (IIRC at the start), in ASCII. So if you are so badly shagged that you've lost / and vgscan can't reconstruct your VG, you can get started by sucking the metadata off the PV with dd. (But normally as long as the PVs are there the VG can be reconstructed. A VG doesn't have any existence beyond its PVs, after all: there is no 'VG area' that can get damaged to destroy your VG.)
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