On Fri, 22 Jan 2016, Anand Jain wrote:
Thanks for the report.
Strange. but interesting. Can you pls help to isolate...
On 01/22/2016 03:50 AM, Scott Talbert wrote:
Hi,
I'm using:
Kernel 4.2.6
btrfs-progs v4.3
Debian Wheezy
I have a RAID1 root filesystem with two devices. When the system
initially boots up, "btrfs fi show" will show the same device twice:
Label: none uuid: 49f7413a-99ad-41b0-8783-06c9406e2280
Total devices 2 FS bytes used 1.19GiB
devid 1 size 7.60GiB used 3.03GiB path /dev/sdf2
devid 2 size 7.60GiB used 3.01GiB path /dev/sdf2
The filesystem seems to work fine (as best as I can tell) in this state.
If I then run another "btrfs device scan", it will correct itself:
Label: none uuid: 49f7413a-99ad-41b0-8783-06c9406e2280
Total devices 2 FS bytes used 1.19GiB
devid 1 size 7.60GiB used 3.03GiB path /dev/sde2
devid 2 size 7.60GiB used 3.01GiB path /dev/sdf2
Any idea what might be going on here? On Debian it appears that the
initial "btrfs device scan" is being done by an initramfs local-premount
script where it does:
modprobe btrfs
/bin/btrfs device scan 2>/dev/null
Does there perhaps need to be some delay between inserting the kernel
module and running a scan?
May be dev1 is known as sdf initially before bootup and later when
system boots its known as sde.
I believe /boot is on non btrfs FS?
/boot is on the btrfs rootfs, ie, /dev/sde2 / /dev/sdf2. I do have a
bios_grub partition as partition #1 but not a separate /boot partition.
As this is a root device, Can you tell which "one" device is used for
the mount in fstab ?
I am using the UUID to mount in fstab:
UUID=49f7413a-99ad-41b0-8783-06c9406e2280 / btrfs
defaults 0 1
Do you see the following log in the bootup logs / dmesg ?
------
printk(KERN_INFO "BTRFS: device fsid %pU devid %llu transid %llu %s %s\n",
disk_super->fsid, devid, transid, path,
ret == 2 ? "(overwritten)":"");
-------
Interestingly, the kernel logs show both devices...
[ 10.225915] BTRFS: device fsid 49f7413a-99ad-41b0-8783-06c9406e2280
devid 2 transid 1033 /dev/sdf2
[ 10.226297] BTRFS: device fsid 49f7413a-99ad-41b0-8783-06c9406e2280
devid 1 transid 1033 /dev/sde2
Can you provide..
blkid output
/dev/sde2: UUID="49f7413a-99ad-41b0-8783-06c9406e2280"
UUID_SUB="692ba0c4-05b9-4681-86c4-b4af9028a533" TYPE="btrfs"
/dev/sdf2: UUID="49f7413a-99ad-41b0-8783-06c9406e2280"
UUID_SUB="63ee640c-0df0-490c-bff6-91d71a246ed6" TYPE="btrfs"
Thanks,
Scott
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