I noticed some other stuff:
[ 371.568931] EXT4-fs: barriers enabled
[ 371.569257] kjournald2 starting. Commit interval 5 seconds
[ 371.569824] EXT4 FS on dm-1, internal journal on dm-1:8
[ 371.569828] EXT4-fs: delayed allocation enabled
[ 371.569831] EXT4-fs: file extents enabled
[ 371.571151] EXT4-fs: mballoc enabled
[ 371.571157] EXT4-fs: mounted filesystem with ordered data mode.
[ 379.816940] JBD: barrier-based sync failed on dm-1:8 - disabling barriers
Barriers seem to be disabled.
$ sudo lvdisplay --maps bulk/testvol
--- Logical volume ---
LV Name /dev/bulk/testvol
VG Name bulk
LV UUID q3e1GQ-zqDS-c30Z-jneb-IbEu-GijR-zOwdL5
LV Write Access read/write
LV Status available
# open 0
LV Size 125.00 GB
Current LE 32000
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 252:1
--- Segments ---
Logical extent 0 to 31999:
Type linear
Physical volume /dev/sda1
Physical extents 102333 to 134332
The volume isn't spread across both disks.
The same script running on a comparable ext3 filesystem, on the same
disk, on the same machine, has had no problems.
--
ext4: panic working with large files
https://bugs.launchpad.net/bugs/348836
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