Re: [libvirt] [PATCH] [RFC] libxl: add discard support to libxl_device_disk

31 Jan 2014


      On Thu, Jan 30, Daniel P. Berrange wrote:
...
Here's two examples:
Thanks, this worked for me:

    <disk type='file' device='disk'>
      <driver name='qemu' type='raw' discard='ignore'/>
      <source file='/disk0.raw'/>
      <target dev='xvda' bus='xen'/>
    </disk>
    <disk type='file' device='disk'>
      <driver name='qemu' type='raw' discard='unmap'/>
      <source file='/disk0.file'/>
      <target dev='xvdb' bus='xen'/>
    </disk>
...
In the case where LIBXL_HAVE_LIBXL_DEVICE_DISK_DISCARD_ENABLE is
not defined, then you should call virReportError with the code
VIR_ERR_CONFIG_UNSUPPORTED, if discard != VIR_DOMAIN_DISK_DISCARD_DEFAULT
This ensures apps get an error if they had requested discard instead
of being silently ignored.
I will test this approach and resend.

Olaf

Re: [libvirt] [PATCH] [RFC] libxl: add discard support to libxl_device_disk

Olaf Hering