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Am 16.05.2014 14:03, schrieb Neil Bothwick:
> On Fri, 16 May 2014 07:14:27 -0400, cov...@ccs.covici.com wrote:
>
>> So far, I have liked lvm, what's the advantage of btrfs over
>> lvm?
>
> I have only looked at btrfs, with a consideration for switching
> from ZFS, but it seems to offer the same advantages as ZFS. That
> is, it makes things even easier than LVM does. with LVM you can
> easily resize volumes and the filesystems on them, but it is still
> two or three steps, more if you add RAID into the equation. The
> modern filesystems do it all at once. If you need a bigger var, you
> just tell it so. And it is exactly the same process for shrinking a
> volume, something that can be tricky with LVM because of the need
> to handle volume and filesystem separately.
btrfs and zfs are removing the various layers we all had to deal with:
partitions, logical volumes, raid-arrays, filesystems, and then
snapshots etc.
With these modern filesystems you are able to basically say:
"I have these physical devices/disks, create me a pool of storage with
these properties" and then just use that pool in a flexible and
dynamic way.
Your disk based storage is then usable in a way RAM is, you add it and
it is available and you can then use it where you like it.
No (or let's say "much less" ...) fixed and hard barriers like
partition sizes, if you need space for /var, use it ... if you want to
set quotas on /home, just set them for the subvolume, if you add
another pair of harddisks, tell btrfs to redistribute redundancy
information ("re-balance").
(I see that Alan right now answered basically the same ;-) ).
You get checksums for your blocks and the possibility to repair rotted
blocks ... you get snapshots within the filesystem, no more slow
rsnapshot-crontabs ...
I used zfs-fuse back then and learned about the concepts, and it blew
my mind already years ago ;-)
zfs on linux ... it works fine for me on one server, but I never
really wanted it on my main machines (desktop and laptops) although I
once even wrote some "how to use zfs on your fully encrypted laptop"
for a magazine. It always feels like "suboptimal because it is not in
the kernel" to me (think licensing issues here).
btrfs is officially in the kernel, still marked "experimental" because
it is in active development, after all I read over the last days it
should be quite stable to use if you don't run very complex setups or
so ... and doing regular backups should be usual for the people in
this list, I assume? Distros like SLES come with btrfs as default fs
(soon).
I migrated ~3 machines to btrfs in the last days and I really love
getting rid of all the partitions and raids that grew over the years
... for now it is cleaned up and flexible and so far solid.
btrfs and zfs have different concepts for various aspects, but
basically the same goals. I definitely recommend to get in touch with
this generation of filesystems.
Stefan
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