Hi list
I tried to copy data from btrfs raid1 to another btrfs raid1 array. To increase
the input/output blocksize from 512k to something bigger (4096k) I used
dd_rescue.
zeros.bin input file is a 1GB size clone of /dev/zero: dd_rescue -vwdDm1G
/dev/zero /mnt/xxx/zeros.bin
now the actual copying process from /mnt/xxx to /mnt/yyy :
dd_rescue -vwdDm1 /mnt/xxx/zeros.bin /mnt/yyy/zeros.bin
resulting in this error message and no data written into /mnt/yyy :
dd_rescue: (warning): O_DIRECT requires hardbs of at least 4096!
dd_rescue: (warning): We don't handle misalignment of last block w/ O_DIRECT!
dd_rescue: (info): about to transfer 0.0 kBytes from /mnt/xxx/zeros.bin to
/mnt/yyy/zeros.bin
dd_rescue: (info): blocksizes: soft 65536, hard 4096
dd_rescue: (info): starting positions: in 0.0k, out 0.0k
dd_rescue: (info): Logfile: (none), Maxerr: 0
dd_rescue: (info): Reverse: no , Trunc: no , interactive: no
dd_rescue: (info): abort on Write errs: yes, spArse write: if err
dd_rescue: (info): ipos: 0.0k, opos: 0.0k, xferd: 0.0k
errs: 0, errxfer: 0.0k, succxfer: 0.0k
+curr.rate: 0kB/s, avg.rate: 0kB/s, avg.load: 0.0%
dd_rescue: (info): problems at ipos 0.0k: Invalid argument
fall back to smaller blocksize
dd_rescue: (info): ipos: 0.0k, opos: 0.0k, xferd: 0.0k
* errs: 0, errxfer: 0.0k, succxfer: 0.0k
+curr.rate: 0kB/s, avg.rate: 0kB/s, avg.load: 0.0%
dd_rescue: (warning): /mnt/xxx/zeros.bin (0.0k): Invalid argument!
Bad block: 0
dd_rescue: (info): ipos 0.0k promote to large bs again!
Summary for /mnt/xxx/zeros.bin -> /mnt/yyy/zeros.bin:
dd_rescue: (info): ipos: 0.0k, opos: 0.0k, xferd: 0.0k
errs: 1, errxfer: 0.0k, succxfer: 0.0k
+curr.rate: 10kB/s, avg.rate: 0kB/s, avg.load: 0.0%
----------------
If I don't use "dD" option it runs fine with a 512k blocksize
* OS in use is debian/squeeze
* kernel: 2.6.32-trunk-686 (linux-image-2.6.32-trunk-686)
* apt-cache policy btrfs-tools
btrfs-tools:
installed: 0.19-8
candidate: 0.19-8
Raids where created like this:
mkfs.btrfs -d raid1 -m raid1 /dev/sdb1 /dev/sdc1
mkfs.btrfs -d raid1 -m raid1 /dev/sdb2 /dev/sdc2
cat /proc/mounts | grep btrfs
/dev/sdb1 /mnt/xxx btrfs rw,relatime 0 0
/dev/sdb2 /mnt/yyy btrfs rw,relatime 0 0
I believe this is a bug - feel free to share your thoughts
_________________________________________________________________
http://redirect.gimas.net/?n=M1002xHMValentin2
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