**Comment from Launchpad by: Raghavendra D Prabhu on: 14-06-2013 10:51:52

The details of XFS filesystem where this happened (for those reproducing this):

xfs_info /dev/sda7
==========================

meta-data=/dev/sda7 isize=256 agcount=4, agsize=1387072 blks
= sectsz=512 attr=2
data = bsize=4096 blocks=5548288, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0
log =internal bsize=4096 blocks=2709, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0

Pretty much standard settings.

**Comment from Launchpad by: Alexey Kopytov on: 14-06-2013 08:49:50

It's not clear why it doesn't fail before prepare, as exactly the same I/O requests are issued. I think the fix is to disable O_DIRECT when manipulating xtrabackup_logfile before and after recovery.