[libvirt] Issue about do Auto Core Dump with compress file format on FC 20

Hi, I'm trying to do Auto Core Dump with compress file format for dump_image_format (such as: bzip2) on Fedora Core 20, but the generated dump image format is not "bzip2". Here are my steps: 1. Prepare a running guest with following configuration in guest's xml # virsh dumpxml domU <domain type='kvm' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'> ... <on_crash>coredump-destroy</on_crash> <qemu:commandline> <qemu:arg value='-device'/> <qemu:arg value='pvpanic'/> </qemu:commandline> </domain> 2. Set following values in /etc/libvirt/qemu.conf dump_image_format = "bzip2" auto_dump_path = "/var/lib/libvirt/qemu/dump" 3. Restart libvirtd service 4. Crash the guest os with the following command in guest #sync #echo c >/proc/sysrq-trigger 5. Check the core dump file under "/var/lib/libvirt/qemu/dump" with file command The output for file command is: (not bzip2 compress format) #file coreDumpFile ELF 64-bit LSB core file x86-64, version 1 (SYSV), SVR4-style So, I want to confirm whether compress file format for dump_image_format is supported by Auto Core Dump? Thanks. Zhengqin