xenRecommended update for XenRecommended update for XenVirtual disks for Xen virtual machines can be stored in a
file accessed via loopback. Limitations of Xen's virtual
disks and the loop driver currently force the administrator
to use synchronous write mode for best data reliability, in
case of domain 0 crashes or power failures. This mode is
very slow, causing VM installations to take hours. This
patch changes the default for virtual disks stored on files
to be non-synchronous, so that installations can be
performed in a reasonable amount of time. It also adds the
ability for the administator to later specify an "S" flag
on the "disk" line in the VM's definition file, to cause
the virtual disk(s) to use synchronous write mode.
When YaST is used to install a new virtual machine to a
virtual disk that is stored in a file, the disk image may
become corrupted after the "Boot Options" stage in YaST.
This issue may be seen when using sparse files, but it is
always present when using non-sparse files. This update
fixes this issue.
Virtual disks for Xen virtual machines can be stored in a
file accessed via loopback. Limitations of Xen's virtual
disks and the loop driver currently force the administrator
to use synchronous write mode for best data reliability, in
case of domain 0 crashes or power failures. This mode is
very slow, causing VM installations to take hours. This
patch changes the default for virtual disks stored on files
to be non-synchronous, so that installations can be
performed in a reasonable amount of time. It also adds the
ability for the administator to later specify an "S" flag
on the "disk" line in the VM's definition file, to cause
the virtual disk(s) to use synchronous write mode.
When YaST is used to install a new virtual machine to a
virtual disk that is stored in a file, the disk image may
become corrupted after the "Boot Options" stage in YaST.
This issue may be seen when using sparse files, but it is
always present when using non-sparse files. This update
fixes this issue.
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