[clue] btrfs vs ZFS question

[Sean LeBlanc]

Another comment - I've been listening to old episodes of this (and 
slowly, slowly catching up) podcast. As the title implies, it's mostly 
about *BSD, but it does have a lot of overlap with other nixes 
especially and sometimes has some interesting tidbits in there - the 
kind of stuff that would come up in CLUE and CLUE-related meetings of 
the past and I think some on here could definitely relate. :)

This talk of ZFS reminds me of this podcast because ZFS seems to come up 
a lot. At least one of the hosts is a FreeBSD committer; I'm not sure if 
that includes any ZFS-related work, but those two seem to know quite a 
bit about it.

https://www.bsdnow.tv/

On 3/27/19 9:33 PM, Shawn Perry wrote:
>
> I’m assuming you mean me, so I’ll answer.
>
>  1. You can add. You should add in the same pattern that already
>     exists to maintain performance and redundancy. If you have a 4
>     disk raid 5, you should add 4 more disks in a raid 5 config.
>      1. You cannot remove yet. 0.8x will allow removing, but only to
>         cover accidental adds.
>  2. You can resize up. If you replace a disk with a larger one, you
>     can expand the space. If you add more disks, you can use the extra
>     space.
>      1. You cannot shrink or remove.
>  3. The data does not need balancing unless you add disks. To
>     rebalance, you would need to re-copy the data. You can use
>     send/recv to do that. You’d need to stop things to do this. The
>     actual stoppage will be only the amount of time it takes you to
>     type “zfs rename <source> <destination>” twice. Once to move the
>     old out of the way, once to move the new back to the original
>     location.
>  4. Sorta. You can split mirrors in a raid 1 or raid 10 config to drop
>     down to a single disk or raid 0, respectively. You cannot reshape
>     like md or btrfs.
>
> *From: *Dennis J Perkins <mailto:dennisjperkins at comcast.net>
> *Sent: *Wednesday, March 27, 2019 9:23 PM
> *To: *CLUE's mailing list <mailto:clue at cluedenver.org>
> *Subject: *[clue] btrfs vs ZFS question
>
> Sean, does ZFS let you do these things?
>
> Btrfs lets you do the following without stopping anything:
>
> 1. Add or remove partitions.  If you remove a partition, make sure the
>
> remaining drives have enough capacity.
>
> 2. Resize a btrfs system.
>
> 3. Balance the data.
>
> 4. Switch between single disk, RAID 0, RAID 1, or RAID 10 configs.
>
> Shuffling data around as a result of any of these operatins is done in
>
> the background and might take hours.
>
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