Re: lvm or btrfs? which is preferable (when, if applicable)

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Reindl Harald wrote:


Am 20.01.2013 02:00, schrieb Ranjan Maitra:
Thanks again for your quick response.

OK, so you are suggesting I move to lvm, or leave things as is, to ext4?
The new installer does not give me an option to format ext4 (but I can
keep it as is, I guess).

How does one convert from ext4 to lvm? Is there any benefit to moving
to lvm?

you should really read some basic documentations

ext4 is a filesystem
btrfs is a filesystem
lvm is NOT a filesystem

you have ext4, btrfs, whatever FS ON TOP of LVM
http://en.wikipedia.org/wiki/Logical_volume_management

for most private environments there is no real benefit of LVM
spread LVM over more than one disk with no RAID under it
is simply dumb becasue if ONE of the disks goes down
you have a problem

Your point about loss of data is well taken, but having data on any storage without RAID for error recovery is a risk, having data on just one machine is a risk. The admin has to balance cost and benefit, for both hardware and administrative learning curve considered as "cost." The benefit of LVM is being able to easily move data to other physical devices and expand the size of storage. LVM can do RAID by itself, although I have always created arrays with mdadm because I'm most familiar with doing it that way.

Note that the user interface to LVM, bad as it is, is still much easier to master than adding drives to a RAID array and growing filesystems. In my opinion,the fewer commands you need to use the less likely you are to make a mistake.

While there are unusual use cases in which btrfs is significantly faster than ext4, and btrfs provides some capabilities not in ext4, most users will see little benefit from it. The problems btrfs was created to address are not common.

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