Re: btrfs is using 25% more disk than it should

[Josef Bacik <jbacik@fb.com>]

On 12/19/2014 04:53 PM, Phillip Susi wrote:
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> On 12/19/2014 4:15 PM, Josef Bacik wrote:
>> Please God don't turn off of checksums.  Checksums are tracked in
>> metadata anyway, they won't show up in the data accounting.  Our
>> csums are 8 bytes per block, so basic math says you are going to
>> max out at 604 megabytes for that big of a file.
>
> Yes, and it is exactly that metadata space he is complaining about.
> So if you don't want to use up all of that space ( and have no use for
> the checksums ), then you turn them off.
>
>> Please people try to only take advice from people who know what
>> they are talking about.  So unless it's from somebody who has
>> commits in btrfs/btrfs-progs take their feedback with a grain of
>> salt.  Thanks,
>
> Well that is rather arrogant and rude.  For that matter, I *do* have
> commits in btrfs-progs.
>

root@destiny ~/btrfs-progs# git log --oneline --author="Phillip Susi"
c65345d btrfs-progs: document --rootdir mkfs switch
f6b6e93 btrfs-progs: removed extraneous whitespace from mkfs man page

Sorry I should have qualified that statement better.

So unless it's from somebody who has had commits to meaningful portions 
of btrfs/btrfs-progs take their feedback with a grain of salt.

There are too many people on this list who give random horribly wrong 
advice to users that can result in data loss or corruption.  Now I'll 
admit I read her question wrong so what you said wasn't incorrect, I'm 
sorry for that.  I've seen a lot of people responding to questions 
recently that I don't recognize that have been completely full of crap, 
I just assumed you were in that camp as well.  Thanks,

Josef