Hi,
any inputs on this would be appreciated.
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I am trying to understand how btrfs handles multiple devices configured to
a single btrfs file system.
As compared to traditinal LVM2, say 2 physical disks /dev/sda, /dev/sdb
are configured as single LVM2 pool and lvm provide an abstract view say
/dev/mapper/VG1-LV1 where VG1 is name of volume
In traditional file systems such as ext3/ext4 when a snapshot (say with
LVM2) is taken, all I/O are frozen and entire file system including meta
dta is part of snapshot.
Btrfs snapshot also managed by file system itself and btrfs snapshot is
actually does a sub volume snapshot which makes a
Btrfs supports btrfs send and receive tools to backup subvolumes which is
built in and good.
However considering the current storage data utilization in the industry,
using send/receive would be very slow operation and kills lot of CUP
cycles of source machine.
As an example, file systems
Sorry. Its typo I used original disk /dev/sdb where filesystem is
created and seeing these errors.
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Henk Slager gmail.com> writes:
>
> On Mon, Apr 18, 2016 at 4:26 PM, Roman Mamedov romanrm.net>
wrote:
> > On Mon, 18 Apr 2016 16:13:28 +0200
> > Henk Slager gmail.com> wrote:
> >
> >> (your email keeps ending up in gmail spam folder)
>
I tried btrfs-image and created image file and ran btrfs-image -r to a
different disk. Once recovered and mounted, I can able to see data is
not zeroed out as mentioned in btrfs-image man page.
I tried on same machine.
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Hi,
I have couple of queries related to btrfs-image, btrfs send and with
combination of two.
1)
I would like to know if a btrfs source file system is spread across more
than 1 disks, does btrfs-image require same number of disks to create
empty file system without files content??
2) would
Hi,
I could find very limited documentation related to on disk layout of btrfs
and how all trees are related to each other. Except wiki which has very
specific top level details I couldn't able to find more details on btrfs.
FSs such as zfs, ext3/4 and XFS there are documents which explains
Henk Slager gmail.com> writes:
>
> sri yahoo.co.in> writes:
>
> >
> > Hi,
> >
> > I Would like to know between 2 snapshots of a subvolume, can we
identify
> > what all blocks modified particular to that subvolume ?
> >
> > there
Hi,
I Would like to know between 2 snapshots of a subvolume, can we identify
what all blocks modified particular to that subvolume ?
there can be many subvolume and snapshots present on the btrfs but i want
only blocks modified since first snapshot for the specific subvolume.
blocks should
em with send/receive is
1. It is file level dump
2. previous snapshot should be present to get incremental otherwise it
generates full backup again.
sri yahoo.co.in> writes:
>
> Hugo Mills carfax.org.uk> writes:
>
> >
> > On Fri, Apr 17, 2015 at 06:24:05AM +,
Hi,
According to btrfs wiki page, under Stability status it is written that
The filesystem disk format is no longer unstable.
Does this mean if there are more I/Os are going on a btrfs file system,
copy of entire disk (all disk blocks) gives a stable disk?
Just to elaborate more, if btrfs
Hugo Mills hugo at carfax.org.uk writes:
On Tue, May 26, 2015 at 08:45:06AM +, sri wrote:
Hi,
According to btrfs wiki page, under Stability status it is written
that
The filesystem disk format is no longer unstable.
Does this mean if there are more I/Os are going
Hi
My query speicific to incremental backup/recovery with btrfs
send/receive option available for btrfs subvolume backups.
say i have /b1/s1 subvolume and snapshot of s1 is /b1/snap1_s1
I run btrfs send /b1/snap_s1 | btrfs receive /backup where /backup is my
backup btrfs file system.
Now I
Hi,
I would like to know if btrfs file system is created on LVM2 logical
volumes, does freeze and thaw operations takes place for btrfs to make
file system consistent??
If not is there a way (ioctl etc..) to run btrfs freeze/thaw before and
after creating LVM2 snapshot of a btrfs file
Hugo Mills hugo at carfax.org.uk writes:
On Mon, Apr 27, 2015 at 12:05:28PM +, sri wrote:
Hi,
I would like to know if btrfs file system is created on LVM2 logical
volumes, does freeze and thaw operations takes place for btrfs to
make
file system consistent??
No, because
Hugo Mills hugo at carfax.org.uk writes:
On Mon, Apr 27, 2015 at 10:34:42PM +0500, Roman Mamedov wrote:
On Mon, 27 Apr 2015 14:55:49 +
Hugo Mills hugo at carfax.org.uk wrote:
This is strange considering that I wanted a consistent snapshot
of
entire btrfs filesystem at
Hi,
Is there any document or something to understand btrfs send format/layout
i.e being created when we give a file with -f option.
I looking for it in order to create similar dump file with same layout so
that I can use btrfs receive with the dump file which I have created in
order to
Hi,
I btrfs file system created with one device /dev/sdb and mounted under
/btrfs1.
created one file /btrfs1/errno.h, one directory /btrfs1/dir1 and
2 subvolumes /btrfs1/subvol1 and /btrfs/subvol2
create directories and files under subvolume /btrfs1/subvol1.
Nothing inside /btrfs1/subvol2.
Hugo Mills hugo at carfax.org.uk writes:
On Mon, Apr 20, 2015 at 02:15:47PM +, sri wrote:
Hi,
I have a subvolume with only one file (file.txt) with 5Mb size.
under /btrfs/subvol1/
1)
I have created 1st snapshot /btrfs/snap1_subvol1. Then I ran btrfs
send and given -f out1
Hi,
I have a subvolume with only one file (file.txt) with 5Mb size.
under /btrfs/subvol1/
1)
I have created 1st snapshot /btrfs/snap1_subvol1. Then I ran btrfs
send and given -f out1.img
size of out1.img is 5Mb.
2)
Next, I have appended 1Mb data to file.txt
And again created snapshot
Hi,
I have below queries. Could somebody help me in understanding.
1)
As per my understanding btrfs file system uses one chunk tree and one
extent tree for entire btrfs disk allocation.
Is this correct?
In, some article i read that future there will be more chunk tree/ extent
tree for single
Hugo Mills hugo at carfax.org.uk writes:
On Fri, Apr 17, 2015 at 06:24:05AM +, sri wrote:
Hi,
I have below queries. Could somebody help me in understanding.
1)
As per my understanding btrfs file system uses one chunk tree and
one
extent tree for entire btrfs disk allocation
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