* raid1
@ 2011-07-12 0:22 krzf83@gmail.com
2011-07-12 0:38 ` raid1 Josef Bacik
0 siblings, 1 reply; 3+ messages in thread
From: krzf83@gmail.com @ 2011-07-12 0:22 UTC (permalink / raw)
To: linux-btrfs
I wanted to confirm that btrfs will continue to work on raid1 when one
of devices will be gone.
dd if=/dev/null of=img0 bs=1 seek=2G
dd if=/dev/null of=img1 bs=1 seek=2G
mkfs.btrfs -d raid1 -m raid1 img0 img1
losetup /dev/loop1 img0
losetup /dev/loop2 img1
mkdir dir
mount -t btrfs /dev/loop1 dir
btrfs device scan
mount -t btrfs /dev/loop1 dir
echo abc > dir/a.txt
umount dir
losetup -d /dev/loop2
btrfs device scan
mount -t btrfs /dev/loop1 dir
mount: wrong fs type, bad option, bad superblock on /dev/loop1,
missing codepage or other error
In some cases useful info is found in syslog - try
dmesg | tail or so
am I missing some nuance?
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: raid1
2011-07-12 0:22 raid1 krzf83@gmail.com
@ 2011-07-12 0:38 ` Josef Bacik
2011-07-12 0:53 ` raid1 krzf83@gmail.com
0 siblings, 1 reply; 3+ messages in thread
From: Josef Bacik @ 2011-07-12 0:38 UTC (permalink / raw)
To: krzf83@gmail.com; +Cc: linux-btrfs
On 07/11/2011 08:22 PM, krzf83@gmail.com wrote:
> I wanted to confirm that btrfs will continue to work on raid1 when one
> of devices will be gone.
>
> dd if=/dev/null of=img0 bs=1 seek=2G
> dd if=/dev/null of=img1 bs=1 seek=2G
> mkfs.btrfs -d raid1 -m raid1 img0 img1
> losetup /dev/loop1 img0
> losetup /dev/loop2 img1
> mkdir dir
> mount -t btrfs /dev/loop1 dir
> btrfs device scan
> mount -t btrfs /dev/loop1 dir
> echo abc> dir/a.txt
> umount dir
> losetup -d /dev/loop2
> btrfs device scan
> mount -t btrfs /dev/loop1 dir
> mount: wrong fs type, bad option, bad superblock on /dev/loop1,
> missing codepage or other error
> In some cases useful info is found in syslog - try
> dmesg | tail or so
>
> am I missing some nuance?
Yeah you need to mount -o degraded. Thanks,
Josef
^ permalink raw reply [flat|nested] 3+ messages in thread
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2011-07-12 0:22 raid1 krzf83@gmail.com
2011-07-12 0:38 ` raid1 Josef Bacik
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