Hi Gerhard
On Friday, May 28, 2010, gmack@xxxxxxxxxxxxx wrote:
> I had my raid set to mount by uuid but that randomly doesn't work so I
> changed to mounting by the first partition in the raid.. that worked but
> on the next reboot it failed. Changing the mount to the second partition
> worked until the next reboot when I needed it to change it back to the
> first. Each change seems to last for one reboot.
Do you perform a "scan" before mounting the first time (after a reboot) a
multivolume btrfs filesystem ?
On the basis of your report it seems no.
Btrfs requires to know where the components of a multi-volume filesystem are.
To do that, you have to "scan" the devices, explicitly
# btrfs scan /dev/sdX1 /dev/sdx2 ...
or implicitly
# btrfs scan
In the last case the btrfs command scans every block device (even the cdrom
and/or floppy).
For other information you may want to read this thread which suggests how udev
can perform the scan.
http://kerneltrap.org/mailarchive/linux-btrfs/2010/4/16/6884594
Regards
>
>
> # mount /dev/sdb1 /home
> mount: wrong fs type, bad option, bad superblock on /dev/sdb1,
> missing codepage or helper program, or other error
> In some cases useful info is found in syslog - try
> dmesg | tail or so
>
> # mount /dev/sdb1 /home
> mount: wrong fs type, bad option, bad superblock on /dev/sdb1,
> missing codepage or helper program, or other error
> In some cases useful info is found in syslog - try
> dmesg | tail or so
>
> mount /dev/sdc1 /home
> (worked)
> # btrfs-show
> failed to read /dev/sr0
> Label: none uuid: a2aa44b8-3168-480a-a155-d510e05853e7
> Total devices 1 FS bytes used 5.46GB
> devid 1 size 29.33GB used 13.29GB path /dev/sda2
>
> Label: fhome uuid: 128ddab5-224d-4f45-abc0-6a07d0f63d47
> Total devices 2 FS bytes used 8.24GB
> devid 1 size 931.51GB used 21.03GB path /dev/sdb1
> devid 2 size 931.51GB used 21.01GB path /dev/sdc1
>
>
> Gerhard
>
>
> --
> Gerhard Mack
>
> gmack@xxxxxxxxxxxxx
>
> <>< As a computer I find your faith in technology amusing.
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