Am Montag, 15. Februar 2010 schrieb Sebastian Harl:
> Heya Martin,
Hallo Sebastian,
> > There has been some sponsoring request regarding btrfs-tools in May 2009,
> > so if someone wants to sponsor this updated version thats fine with me.
> > If not, thats fine with me to. I will provide updates as long as I use
> > Lenny on my Workstation at work at least.
>
> Do you consider the package to be stable enough to be available for
> stable (in a rather official/well-known place)? What do other think
> about making btrfs stuff available in bpo? If there are no objections,
> I'll sponsor the upload.
Well it basically works with a self built 2.6.32 kernel. I think it won't work
with 2.6.30 bpo kernel as there was a format change. Upstream considers it as
experimental. Raid options - at least raid1 - do not appear to work yet, at
least according to df disk usage figures (see below). So no, not stable for
production use, not stable for production data - insert your favorite
DISCLAIMER here.
But IMHO stable enough to play around with it. So interesting for everyone who
wants to have an early glimpse at BTRFS without upgrading his Debian system
to squeeze/sid. btrfs-tools 0.19 is quite old in itself already compared to
git HEAD, but thats what official available in Debian Squeeze/Sid ATM.
I do not have a firm oppinion. On one side I would not like to advertise BTRFS
as being stable. On the other hand it can come quite handy to have some BTRFS
test partition running on an Debian Lenny machine. Make your pick.
I used:
ms@mango:~> cat /proc/version
Linux version 2.6.32.3-workstation-toi-3.0.99.45-dirty (ms@mango)
And tested like this:
mango:~# pvcreate --metadatacopies 2 /dev/sda8
Physical volume "/dev/sda8" successfully created
mango:~# pvcreate --metadatacopies 2 /dev/sdb8
Physical volume "/dev/sdb8" successfully created
mango:~# vgcreate mango1 /dev/sda8
Volume group "mango1" successfully created
mango:~# vgcreate mango2 /dev/sdb8
Volume group "mango2" successfully created
mango:~# lvcreate -n homelokal1 -L 200G /dev/sda8
Volume group "sda8" not found
mango:~# lvcreate -n homelokal1 -L 200G mango1
Logical volume "homelokal1" created
mango:~# lvcreate -n homelokal2 -L 200G mango1
Logical volume "homelokal2" created
mango:~# modprobe btrfs
otherwise /dev/btrfs-control which mkfs.btrfs tries to access is not available
mango:~# mkfs.btrfs -d raid1 -m
raid1 /dev/mango1/homelokal1 /dev/mango2/homelokal2
WARNING! - Btrfs Btrfs v0.19 IS EXPERIMENTAL
WARNING! - see http://btrfs.wiki.kernel.org before using
adding device /dev/mango2/homelokal2 id 2
fs created label (null) on /dev/mango1/homelokal1
nodesize 4096 leafsize 4096 sectorsize 4096 size 400.00GB
Btrfs Btrfs v0.19
mango:~# mount -t btrfs /dev/mango1/homelokal1 /mnt/zeit
mango:~# ls -l /mnt/zeit
insgesamt 0
mango:~# df -hT /mnt/zeirt
df: „/mnt/zeirt“: Datei oder Verzeichnis nicht gefunden
df: keine Dateisysteme bearbeitet
mango:~# df -hT /mnt/zeit
Dateisystem Typ Größe Benut Verf Ben% Eingehängt auf
/dev/mapper/mango1-homelokal1
btrfs 400G 28K 400G 1% /mnt/zeit
This should be 200G if it was a RAID 1. So this smells like RAID 0 being used.
mango:~# touch /mnt/zeit/hallo
mango:~# dd if=/dev/zero of=/mnt/zeit/ddimg bs=1M count=100
100+0 Datensätze ein
100+0 Datensätze aus
104857600 Bytes (105 MB) kopiert, 0,313594 s, 334 MB/s
At least it reads back in what I wrote ;-):
mango:~# hd /mnt/zeit/ddimg
00000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
06400000
Ciao,
--
Martin Steigerwald
Trainer / Consultant / System Engineer
team(ix) GmbH
Solide IT-Infrastruktur
Südwestpark 35
90449 Nürnberg
fon: +49 (911) 30999- 0
fax: +49 (911) 30999-99
mail: ms@teamix.de
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