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Old 05-30-2011, 05:13 AM
Michael Wiktowy
 
Default btrfs advice?

I made the leap to a btrfs root partition for my netbook with a fresh
install of F15.

Everything seems to work fine and I have done some fair amount of
Googling for information and come across
https://btrfs.wiki.kernel.org/index.php/Getting_started which offers
some great (incomplete) info but nothing Fedora specific. I have some
questions about how to move forward to take advantage of btrfs:

1) Is there any kind of integration of btrfs with the included apps
(For example: automatic snapshots before yum updates allowing easy
rollbacks, deja dup backing up a btrfs snapshot so that currently
changing data doesn't affect the backup process, a kiosk mode that
rolls back a home directory to a known state after logout, etc.) or is
that the next step to take advantage of all the new bells and whistles
and F15 is just a test-btrfs-as-a-ext4-replacement release?

2) I see (using 'mount') that the root is btrfs along with some (what
appear to be) subvolumes for /tmp, /var/tmp and /home yet 'btrfs
device scan' shows no information. Does 'btrfs device scan' only scan
unmounted devices or is this a bug?

3) I have read at Phoronix that using the transparent compression
offers a fair performance gain (
http://www.phoronix.com/scan.php?page=article&item=btrfs_space_cache&num=1
) with mixed results when combining that with space cache. Has the
space cache+compression degradation seen in some benchmarks been fixed
in F15? Also, is using transparent compression simply a matter of
adding the correct mount flag to /etc/fstab or is there a more complex
conversion process to be followed that needs to be done offline?

4) Since this is a netbook with a modest Atom processor, would
enabling transparent compression just load the CPU such that any
performance is negated or cause significant battery drain?

Thank you for any experience you have to offer.

/Mike
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Old 05-30-2011, 06:59 PM
"Garry T. Williams"
 
Default btrfs advice?

On Monday, May 30, 2011 01:13:10 Michael Wiktowy wrote:
> I made the leap to a btrfs root partition for my netbook with a fresh
> install of F15.
>
> 1) Is there any kind of integration of btrfs with the included apps
> (For example: automatic snapshots before yum updates allowing easy
> rollbacks,

See

https://btrfs.wiki.kernel.org/index.php/UseCases#I_want_to_be_able_to_do_rollbacks_with_Bt rfs

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Old 05-30-2011, 07:06 PM
Rahul Sundaram
 
Default btrfs advice?

On 05/30/2011 10:43 AM, Michael Wiktowy wrote:
> I made the leap to a btrfs root partition for my netbook with a fresh
> install of F15.
>
> Everything seems to work fine and I have done some fair amount of
> Googling for information and come across
> https://btrfs.wiki.kernel.org/index.php/Getting_started which offers
> some great (incomplete) info but nothing Fedora specific. I have some
> questions about how to move forward to take advantage of btrfs:
>
> 1) Is there any kind of integration of btrfs with the included apps
> (For example: automatic snapshots before yum updates allowing easy
> rollbacks, deja dup backing up a btrfs snapshot so that currently
> changing data doesn't affect the backup process, a kiosk mode that
> rolls back a home directory to a known state after logout, etc.) or is
> that the next step to take advantage of all the new bells and whistles
> and F15 is just a test-btrfs-as-a-ext4-replacement release?

Read https://fedoraproject.org/wiki/Fedora_15_announcement

> 2) I see (using 'mount') that the root is btrfs along with some (what
> appear to be) subvolumes for /tmp, /var/tmp and /home yet 'btrfs
> device scan' shows no information. Does 'btrfs device scan' only scan
> unmounted devices or is this a bug?

Potentially. Might post in their mailing list or report it in bugzilla
and check.

[Snipped the other questions I have no idea about]

Rahul
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Old 05-31-2011, 01:48 AM
"Clyde E. Kunkel"
 
Default btrfs advice?

On 05/30/2011 01:13 AM, Michael Wiktowy wrote:
> <snip>
>
> 2) I see (using 'mount') that the root is btrfs along with some (what
> appear to be) subvolumes for /tmp, /var/tmp and /home yet 'btrfs
> device scan' shows no information. Does 'btrfs device scan' only scan
> unmounted devices or is this a bug?
><snip>

try:

$ sudo btrfs device scan
$ dmesg | grep transid

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Old 05-31-2011, 05:35 AM
Michael Wiktowy
 
Default btrfs advice?

On Mon, May 30, 2011 at 10:48 PM, Clyde E. Kunkel
<clydekunkel7734@cox.net> wrote:
> On 05/30/2011 01:13 AM, Michael Wiktowy wrote:
>> <snip>
>>
>> 2) I see (using 'mount') that the root is btrfs along with some (what
>> appear to be) subvolumes for /tmp, /var/tmp and /home yet 'btrfs
>> device scan' shows no information. Does 'btrfs device scan' only scan
>> unmounted devices or is this a bug?
>><snip>
>
> try:
>
> $ sudo btrfs device scan
> $ dmesg | grep transid

This is a direct cut and paste:

[mwiktowy@netbook ~]$ sudo btrfs device scan
[sudo] password for mwiktowy:
Scanning for Btrfs filesystems
[mwiktowy@netbook ~]$ dmesg|grep transid
[ 3.600235] device fsid 7a4812176077d1e2-369760c3b102cf84 devid 1
transid 1709 /dev/sda3
[ 3.649785] device fsid 7a4812176077d1e2-369760c3b102cf84 devid 1
transid 1709 /dev/sda3
[ 3.869158] device fsid 7a4812176077d1e2-369760c3b102cf84 devid 1
transid 1709 /dev/sda3
[ 9877.217727] device fsid 7a4812176077d1e2-369760c3b102cf84 devid 1
transid 1951 /dev/sda3

Nothing shows up with the btrfs tool but grepping the start up logs
reveals btrfs activity. I guess I will write a bug report and see what
comes of it.

To answer my own question 3) and somewhat 4):
I just added the compress=lzo option in fstab and that seems to work
without problems so far and grepping /var/log/messages indicates that
the kernel is using that flag. It doesn't seem to add all that much
CPU load from what I can tell ... what does add significant CPU load
is actually *viewing* the CPU load with System Monitor. It seems that
drawing a graph in screen in F15 is quite labour intensive. Heisenberg
uncertainly certainly applies with CPU load.

/Mike
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Old 06-01-2011, 08:00 PM
Michael Wiktowy
 
Default btrfs advice?

On Tue, May 31, 2011 at 2:35 AM, Michael Wiktowy
<michael.wiktowy@gmail.com> wrote:
> Nothing shows up with the btrfs tool but grepping the start up logs
> reveals btrfs activity. I guess I will write a bug report and see what
> comes of it.

Bug submitted:
https://bugzilla.redhat.com/show_bug.cgi?id=709867
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