On 11/30/2014 04:31 AM, Shriramana Sharma wrote:
> I am confused with this: should I call it the "root subvol" or
> "top-level subvol" or "default subvol" or doesn't it matter? Are all
> subvols equal, or some are more equal than others [hark to Orwell's
> Animal Farm ;-)]?
>
> And more importantl
I'm having an issue with a filesystem where I'm regularly running out of disk
space during deduplication with bedup. Rebalancing does not help and the same
issue occurs even after a full rebalance.
Main use-case for this filesystem is a 3 TB backup disk where I'm creating
backups by copying a newe
Robert White posted on Sat, 29 Nov 2014 08:50:57 -0800 as excerpted:
> To those reading along who don't already know. My explanation below is
> factually inadequate or wrong in various places...
>
> The "type codes" as presented in the various EFI/GUID disk partitioning
> tools as 0700, 8200, 830
On Sun, Nov 30, 2014 at 09:16:38AM +0530, Shriramana Sharma wrote:
> https://btrfs.wiki.kernel.org/index.php/FAQ#Is_btrfs_stable.3F still
> reads experimental whereas the warning has been removed in the tools
> recently IIUC. The FAQ item to be updated, no?
I would say no.
Btrfs is still unstable,
On Sun, Nov 30, 2014 at 09:03:14AM +0530, Shriramana Sharma wrote:
> IIUC with BtrFS while it is possible to easily undelete a file or
> ordinary directory if a snapshot of the containing subvol exists, it
> seems that it's not elementary to undelete a subvol itself, because
> all subvols are under
On Sun, Nov 30, 2014 at 09:01:42AM +0530, Shriramana Sharma wrote:
> So the Ubuntu Wiki BtrFS entry advises against using subvol
> set-default because it boots its kernel using root=subvol=@ and home
> as subvol=@home, and these two subvols are only present under the
> subvol with ID 5. But isn't i
On Sun, Aug 31, 2014 at 7:25 AM, Shriramana Sharma wrote:
> Hello. There seem to be lots of questions in various forums re the
> output of btrfs fi df -- especially w.r.t. the usage of the word
> "total". For example see https://community.oracle.com/thread/2459838
>
> I feel it would make the inte
On Sat, Nov 29, 2014 at 10:37 PM, Robert White wrote:
>
> One thing to keep in mind is that mv, when crossing any of these boundaries
> degenerates to a copy-and-remove operation and _none_ of the source files
> will be removed until _all_ of the files have been copied. If any of the
> copy operat
I am asked to read the ToS before signing up on the wiki:
Make sure that you first read the Terms of Service before requesting an account.
... but the link is red and the page does not exist.
For signing up I'm going to say I've "agreed to the ToS" anyhow, but
still either there should be a ToS
https://btrfs.wiki.kernel.org/index.php/FAQ#Is_btrfs_stable.3F still
reads experimental whereas the warning has been removed in the tools
recently IIUC. The FAQ item to be updated, no?
--
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IIUC with BtrFS while it is possible to easily undelete a file or
ordinary directory if a snapshot of the containing subvol exists, it
seems that it's not elementary to undelete a subvol itself, because
all subvols are under the root-level subvol (id 0 or 5, see my other
q) but even snapshotting th
I am confused with this: should I call it the "root subvol" or
"top-level subvol" or "default subvol" or doesn't it matter? Are all
subvols equal, or some are more equal than others [hark to Orwell's
Animal Farm ;-)]?
And more importantly, is the ID of the root subvol 0 or 5?
The Oracle guide
(ht
So the Ubuntu Wiki BtrFS entry advises against using subvol
set-default because it boots its kernel using root=subvol=@ and home
as subvol=@home, and these two subvols are only present under the
subvol with ID 5. But isn't it just possible to move i.e. reparent a
subvol so I can move these two unde
John Williams wrote:
> On Sat, Nov 29, 2014 at 1:07 PM, Alex Elsayed
> wrote:
>> I'd suggest looking more closely at the crypto api section of menuconfig
>> - it already has crc32c, among others. Just because it's called the
>> "crypto api" doesn't mean it only has cryptographically-strong
>> alg
On Sat, Nov 29, 2014 at 1:07 PM, Alex Elsayed wrote:
> I'd suggest looking more closely at the crypto api section of menuconfig -
> it already has crc32c, among others. Just because it's called the "crypto
> api" doesn't mean it only has cryptographically-strong algorithms.
I have looked. What 12
On Sat, Nov 29, 2014 at 1:20 AM, Robert White wrote:
> On 11/28/2014 11:29 PM, Duncan wrote:
>>
>> Since I can't/won't run pretty much anything proprietary, there's little
>> chance of it being taken as anything but Linux, here. (Tho I actually
>> use (c)gdisk for partitioning here and it appears
On Sat, Nov 29, 2014 at 09:34:01PM +0100, Jakob Schürz wrote:
> Hi there!
>
> I made a script to do backup with btrfs on a external HD.
> You can see the function, how it works, and how it's to be used on
> my site http://linux.xundeenergie.at/doku.php?id=mkbtrbackup
> The site is in german. An en
John Williams wrote:
> On Sat, Nov 29, 2014 at 12:38 PM, Alex Elsayed
> wrote:
>> Why not just use the kernel crypto API? Then the user can just specify
>> any hash the kernel supports.
>
> One reason is that crytographic hashes are an order of magnitude
> slower than the fastest non-cryptograph
On Sat, Nov 29, 2014 at 12:38 PM, Alex Elsayed wrote:
> Why not just use the kernel crypto API? Then the user can just specify any
> hash the kernel supports.
One reason is that crytographic hashes are an order of magnitude
slower than the fastest non-cryptographic hashes. And for filesystem
chec
Hi there!
I made a script to do backup with btrfs on a external HD.
You can see the function, how it works, and how it's to be used on my
site http://linux.xundeenergie.at/doku.php?id=mkbtrbackup
The site is in german. An english one will follow later.
Do you want some explanations?
greetings
David Sterba wrote:
> On Mon, Nov 24, 2014 at 01:23:05PM +0800, Liu Bo wrote:
>> This brings a strong-but-slow checksum algorithm, sha256.
>>
>> Actually btrfs used sha256 at the early time, but then moved to crc32c
>> for performance purposes.
>>
>> As crc32c is sort of weak due to its hash col
On 11/29/2014 07:15 AM, Shriramana Sharma wrote:
On Sat, Nov 29, 2014 at 7:58 PM, Hugo Mills wrote:
The latest version of mv should be able to use CoW copies to make
it more efficient. It has a --reflink option, the same as cp. Note
that you can't make reflinks crossing a mount boundary, bu
To those reading along who don't already know. My explanation below is
factually inadequate or wrong in various places...
The "type codes" as presented in the various EFI/GUID disk partitioning
tools as 0700, 8200, 8300, EF02, and so on are never written to disk as
such. They are short-hand va
On 11/29/2014 01:41 AM, Duncan wrote:
Robert White posted on Sat, 29 Nov 2014 00:20:11 -0800 as excerpted:
l Display a summary of partition types. GPT uses a GUID to
identify partition types for particular OSes and purposes. For
ease of data entry, gdisk compresses these int
On Sat, Nov 29, 2014 at 7:58 PM, Hugo Mills wrote:
>The latest version of mv should be able to use CoW copies to make
> it more efficient. It has a --reflink option, the same as cp. Note
> that you can't make reflinks crossing a mount boundary, but you can do
> so crossing a subvolume boundary
On Sat, Nov 29, 2014 at 07:51:07PM +0530, Shriramana Sharma wrote:
> Hello. I am now taking the first steps to making my backup external
> HDD in BtrFS. From
> http://askubuntu.com/questions/119014/btrfs-subvolumes-vs-folders I
> understand that the only difference between subvolumes and ordinary
>
Hello. I am now taking the first steps to making my backup external
HDD in BtrFS. From
http://askubuntu.com/questions/119014/btrfs-subvolumes-vs-folders I
understand that the only difference between subvolumes and ordinary
folders is that the former can be snapshotted and independently
mounted.
Bu
Robert White posted on Sat, 29 Nov 2014 00:20:11 -0800 as excerpted:
> On 11/28/2014 11:29 PM, Duncan wrote:
>> (Tho I actually use (c)gdisk for partitioning here and it appears to
>> use a different GUID. (0700 in its short form which AFAIK is gdisk
>> specific, for MS basic data, while it uses 8
On 11/28/2014 11:29 PM, Duncan wrote:
Since I can't/won't run pretty much anything proprietary, there's little
chance of it being taken as anything but Linux, here. (Tho I actually
use (c)gdisk for partitioning here and it appears to use a different GUID.
(0700 in its short form which AFAIK is g
On 11/28/2014 11:35 PM, Goffredo Baroncelli wrote:
I agree with you; but I have to find a "default" so during the boot
a system can start even if snapshots are present.
No, you really _don't_ need to find such a default.
Better a system that doesn't boot than one that boots based on a guess.
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