Why xtrabackup is so slow compared to a single cp ?

IM experiencing a vast difference in copy time when I compare the ibdata creation rate in xtrabackup compared to a single cp… why is that?

Some info:
xtrabackup: 14GB/hour (4MB/s)
cp: 120GB/hour (33MB/s)

Its the same machine and same disks

Hi, can you provide below details?

  • Xtrabackup version
  • MySQL/Percona Server version
  • OS version
  • Xtrabackup 2.0
  • MySQL 5.1.48
  • Linux #1 SMP Fri Feb 15 12:34:28 EST 2008 x86_64 GNU/Linux