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The qemu manpage in RHEL 6 doesn't document the rerror/werror/readonly options for -drive, even though these options are implemented. They should be added to the manpage.
Fix included in qemu-kvm-0.12.1.2-2.420.el6
Steps to reproduce and verify this issue: 1. dump output of man qemu-kvm for fixed qemu-kvm and unfixed qemu-kvm 2. run diff on them Tested with qemu-kvm-0.12.1.2-2.428.el6.x86_64 and qemu-kvm-0.12.1.2-2.415.el6.x86_64. Actual result is as below: # diff -up qemu-kvm-man-old qemu-kvm-man --- qemu-kvm-man-old 2014-07-01 13:49:01.385203252 +0800 +++ qemu-kvm-man 2014-07-01 13:43:02.638202102 +0800 @@ -168,6 +168,17 @@ OPTIONS addr=addr Specify the controller’s PCI address (if=virtio only). + werror=action,rerror=action + Specify which action to take on write and read errors. Valid + actions are: "ignore" (ignore the error and try to continue), + "stop" (pause QEMU), "report" (report the error to the guest), + "enospc" (pause QEMU only if the host disk is full; report the + error to the guest otherwise). The default setting is + werror=enospc and rerror=report. + + readonly + Open drive file as read-only. Guest write attempts will fail. + As per above, this issue has been fixed.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. http://rhn.redhat.com/errata/RHBA-2014-1490.html