There is also the ability to use LVM for storage tiering via LVM caching. really cool tech to speed up a spinning rust drive. I have presented this to the group in the past.
On Tue, Aug 19, 2025 at 4:23 PM Steve Litt via PLUG-discuss < [email protected]> wrote: > > On Tue, 19 Aug 2025 11:20:57 -0700 > Mark Phillips via PLUG-discuss <[email protected]> wrote: > > > In terms of a major reinstall, should I use LVM or not? > > No, don't use LVM. Just one more abstraction layer to go wrong and bork > all your data. It also adds more learning to our already > overburdened minds. From my understanding, LVM bestows three advantages: > > 1) "Rubber" partitions that can grow and shrink. > > 2) Partition snapshots. > > 3) Combining multiple hardware disks into one virtual disk. > > Now, with the advent of bind mounts, rubber partitions are trivial > without LVM or any other abstraction layer. > > You can get pretty close to the utility of snapshots with rsync. If you > want real snapshots, just substitute btrfs instead of ext4. > > Combining multiple hardware disks is often done for the wrong reason. I > wish I had a dime for every person trying to combine a 20 year old 20GB > drive, a 10 year old 1TB drive, and a current day 16GB drive, just to > add 1020GB to a 16,000,000 GB system. Not worth the added complexity of > LVM. > > A better reason is to add in a new 20TB drive after your 16TB drive > became full. But still not good enough. The new drive can be carved up > into directories to be bind-mounted to mountpoints on the 20GB drive, > so LVM is still not necessary. > > Maybe there's some RAID related reason to use LVM. I wouldn't know > because I don't use RAID. If you don't need high availability or error > correction, why use RAID. If you DO need high availability or error > correction, then you can take everything I've said with a grain of > salt, because your use case is different. > > SteveT > > Steve Litt > Spring 2023 featured book: Troubleshooting Techniques of the Successful > Technologist http://www.troubleshooters.com/techniques > > --------------------------------------------------- > PLUG-discuss mailing list: [email protected] > To subscribe, unsubscribe, or to change your mail settings: > https://lists.phxlinux.org/mailman/listinfo/plug-discuss > -- A mouse trap, placed on top of your alarm clock, will prevent you from rolling over and going back to sleep after you hit the snooze button. Stephen
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