Just curious, could this functionality be used somehow to allow for a **consistent** disk snapshot using flashcopy for a live Linux guest? What I mean is that currently, we have to shutdown the guest, do the flashcopy and then restart the guest. Is there a way we can tell the Linux guest to freeze, take a snapshot of the disks and then resume?
-----Original Message----- From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of Rob van der Heij Sent: Thursday, August 30, 2012 7:47 AM To: LINUX-390@VM.MARIST.EDU Subject: Re: LGR guest quiesce On 30 August 2012 11:43, Lu GL Gao <lu...@cn.ibm.com> wrote: Linux guest move its memory to target z/VM member during relocating. Then > it quiesce and resume on target z/VM. > How to understand "quiesce"? What state of linux when it is in quiesce > time? Is idling? shutdown? or something? > See it as "frozen while running" - as long as Linux is actually running, it may change memory that z/VM already copied over, so z/VM will copy it again, and again... To stop that, finally the guest is frozen for a very short period, not making any further changes. That gives z/VM time to copy the last bits and the guest then continues to run on the other side, at the very instruction where it was frozen before. Linux will observe that some time passed where it did not run, but that's normal in time sharing. Rob ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/ ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/
