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Thu, 2 Jan 2020 16:00:49 +0000 (UTC) Received: from heinz.dinsnail.net (heinz.dinsnail.net [81.169.187.250]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-194-w7sAfhZgMWCL2BegLZHqiw-1; Thu, 02 Jan 2020 11:00:43 -0500 Received: from heinz.dinsnail.net ([IPv6:0:0:0:0:0:0:0:1]) by heinz.dinsnail.net (8.15.2/8.15.2) with ESMTP id 002G0a2J004177; Thu, 2 Jan 2020 17:00:36 +0100 Received: (from michael@localhost) by heinz.dinsnail.net (8.15.2/8.15.2/Submit) id 002G0anu004176; Thu, 2 Jan 2020 17:00:36 +0100 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1577980862; h=from:from:sender:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:list-id:list-help: list-unsubscribe:list-subscribe:list-post; bh=nT7R1gVHN/Nb1m2ybLnaSZU1ytlby4z0e28NWWZkgpE=; b=AXY84vuz8+YJevZV2WghYn6GE+ev93JP/EfbqRwjz4J+i93c+Hif9DlthQm5Wr6DPhtDrs os5Kvx5/N5u9PKeT/nvS7tpUvNoSLaIIuQSqp8w0CrSM2mfVqVrqPCIECKm+im+5xlvN3l wT8Kf0PALEHZCPkMgmmRpYy3oz3T9cY= From: Michael Weiser To: libvir-list@redhat.com Date: Thu, 2 Jan 2020 17:00:26 +0100 Message-Id: <20200102160026.2997988-4-michael.weiser@gmx.de> In-Reply-To: <20200102160026.2997988-1-michael.weiser@gmx.de> References: <20200102160026.2997988-1-michael.weiser@gmx.de> MIME-Version: 1.0 X-dinsnail-net-MailScanner-Information: Please contact the ISP for more information X-dinsnail-net-MailScanner-ID: 002G0a2J004177 X-dinsnail-net-MailScanner: Found to be clean X-dinsnail-net-MailScanner-From: michael@heinz.dinsnail.net X-Spam-Status: No X-MC-Unique: w7sAfhZgMWCL2BegLZHqiw-1 X-MC-Unique: DscGApeHOauNzJ8cFS0YIQ-1 X-Scanned-By: MIMEDefang 2.79 on 10.11.54.5 X-MIME-Autoconverted: from quoted-printable to 8bit by lists01.pubmisc.prod.ext.phx2.redhat.com id 002G0n1Z014378 X-loop: libvir-list@redhat.com Cc: Daniel Henrique Barboza , Michael Weiser , Cole Robinson Subject: [libvirt] [PATCH v2 3/3] docs: Add snapshot-revert qemu managedsave force X-BeenThere: libvir-list@redhat.com X-Mailman-Version: 2.1.12 Precedence: junk List-Id: Development discussions about the libvirt library & tools List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: libvir-list-bounces@redhat.com Errors-To: libvir-list-bounces@redhat.com X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Mimecast-Spam-Score: 0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @redhat.com) Content-Type: text/plain; charset="utf-8" Add documentation for additional reason why snapshot-revert might need to be forced. This explains why restoring an inactive snapshot while there is managed saved state is refused by default. Signed-off-by: Michael Weiser Cc: Cole Robinson Reviewed-by: Daniel Henrique Barboza --- docs/manpages/virsh.rst | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/docs/manpages/virsh.rst b/docs/manpages/virsh.rst index f5f962cba1..09be872fdf 100644 --- a/docs/manpages/virsh.rst +++ b/docs/manpages/virsh.rst @@ -6951,7 +6951,7 @@ no vm state leaves the domain in an inactive state. = Passing either the transient domains cannot be inactive, it is required to use one of these flags when reverting to a disk snapshot of a transient domain. =20 -There are two cases where a snapshot revert involves extra risk, which +There are a number of cases where a snapshot revert involves extra risk, w= hich requires the use of *--force* to proceed: =20 * One is the case of a snapshot that lacks full domain information for @@ -6961,7 +6961,7 @@ requires the use of *--force* to proceed: libvirt that the snapshot is compatible with the current configuration (and if it is not, the domain will likely fail to run). =20 - * The other is the case of reverting from a running domain to an active + * Another is the case of reverting from a running domain to an active state where a new hypervisor has to be created rather than reusing the existing hypervisor, because it implies drawbacks such as breaking any existing VNC or Spice connections; this condition happens with an acti= ve @@ -6969,6 +6969,13 @@ requires the use of *--force* to proceed: an inactive snapshot that is combined with the *--start* or *--pause* flag. =20 + * Also, libvirt will refuse to restore snapshots of inactive qemu domains + while there is managed saved state. This is because those snapshots do= not + contain memory state and will therefore not replace the exising memory + state. This ends up switching a disk underneath a running system and w= ill + likely cause extensive filesystem corruption or crashes due to swap co= ntent + mismatches when run. + =20 snapshot-delete --------------- --=20 2.24.1 -- libvir-list mailing list libvir-list@redhat.com https://www.redhat.com/mailman/listinfo/libvir-list