From: Wen Congyang <ghostwcy@gmail.com>
To: Stefan Hajnoczi <stefanha@redhat.com>
Cc: Kevin Wolf <kwolf@redhat.com>, Fam Zheng <famz@redhat.com>,
Lai Jiangshan <laijs@cn.fujitsu.com>,
qemu block <qemu-block@nongnu.org>,
Stefan Hajnoczi <stefanha@gmail.com>,
Jiang Yunhong <yunhong.jiang@intel.com>,
Dong Eddie <eddie.dong@intel.com>,
qemu devel <qemu-devel@nongnu.org>, Max Reitz <mreitz@redhat.com>,
Gonglei <arei.gonglei@huawei.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Yang Hongyang <yanghy@cn.fujitsu.com>,
"Dr. David Alan Gilbert" <dgilbert@redhat.com>,
zhanghailiang <zhang.zhanghailiang@huawei.com>
Subject: Re: [Qemu-devel] [Qemu-block] [PATCH COLO-Block v6 07/16] Add new block driver interface to connect/disconnect the remote target
Date: Tue, 23 Jun 2015 21:54:04 +0800 [thread overview]
Message-ID: <558964FC.5080805@gmail.com> (raw)
In-Reply-To: <20150623134243.GA31481@stefanha-thinkpad.redhat.com>
At 2015/6/23 21:42, Stefan Hajnoczi Wrote:
> On Mon, Jun 22, 2015 at 09:56:24PM +0800, Wen Congyang wrote:
>>> The NBD connect should not be performed during downtime, regardless of
>>> whether a monitor command is used or not.
>>
>> Why?
>
> NBD connection establishment takes unbounded time. It can extend the
> downtime period and cause users to notice that the guest is unavailable.
>
> The point of COLO is fault tolerance and high availability. In order to
> achieve that, COLO must minimize downtime. If an operation can be
> performed outside the migration downtime phase, then it should be done
> outside.
Yes, you are right. I will think about it.
Thanks
Wen Congyang
>
> Stefan
>
next prev parent reply other threads:[~2015-06-23 13:56 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-18 8:49 [Qemu-devel] [PATCH COLO-Block v6 00/16] Block replication for continuous checkpoints Wen Congyang
2015-06-18 8:49 ` [Qemu-devel] [PATCH COLO-Block v6 01/16] docs: block replication's description Wen Congyang
2015-06-18 10:34 ` Stefan Hajnoczi
2015-06-18 10:51 ` Wen Congyang
2015-06-18 8:49 ` [Qemu-devel] [PATCH COLO-Block v6 02/16] allow writing to the backing file Wen Congyang
2015-06-18 8:49 ` [Qemu-devel] [PATCH COLO-Block v6 03/16] Allow creating backup jobs when opening BDS Wen Congyang
2015-06-18 10:40 ` [Qemu-devel] [Qemu-block] " Stefan Hajnoczi
2015-06-18 8:49 ` [Qemu-devel] [PATCH COLO-Block v6 04/16] block: Parse "backing_reference" option to reference existing BDS Wen Congyang
2015-06-18 10:50 ` Stefan Hajnoczi
2015-06-18 11:40 ` Wen Congyang
2015-06-18 8:49 ` [Qemu-devel] [PATCH COLO-Block v6 05/16] Backup: clear all bitmap when doing block checkpoint Wen Congyang
2015-06-18 8:49 ` [Qemu-devel] [PATCH COLO-Block v6 06/16] Don't allow a disk use backing reference target Wen Congyang
2015-06-18 12:47 ` Stefan Hajnoczi
2015-06-18 15:17 ` Wen Congyang
2015-06-18 8:49 ` [Qemu-devel] [PATCH COLO-Block v6 07/16] Add new block driver interface to connect/disconnect the remote target Wen Congyang
2015-06-18 12:55 ` [Qemu-devel] [Qemu-block] " Stefan Hajnoczi
2015-06-18 14:36 ` Wen Congyang
2015-06-18 16:06 ` Stefan Hajnoczi
2015-06-19 0:54 ` Wen Congyang
2015-06-19 10:49 ` Stefan Hajnoczi
2015-06-20 3:31 ` Wen Congyang
2015-06-22 12:39 ` Stefan Hajnoczi
2015-06-22 13:56 ` Wen Congyang
2015-06-23 13:42 ` Stefan Hajnoczi
2015-06-23 13:54 ` Wen Congyang [this message]
2015-06-24 14:07 ` Dr. David Alan Gilbert
2015-06-25 1:01 ` Wen Congyang
2015-06-26 19:03 ` Dr. David Alan Gilbert
2015-06-29 1:05 ` Wen Congyang
2015-06-30 19:01 ` Dr. David Alan Gilbert
2015-07-01 1:01 ` Wen Congyang
2015-07-01 8:11 ` Dr. David Alan Gilbert
2015-07-01 8:18 ` Wen Congyang
2015-07-01 18:42 ` Dr. David Alan Gilbert
2015-07-02 0:55 ` Wen Congyang
2015-07-02 7:54 ` Dr. David Alan Gilbert
2015-07-02 8:05 ` Wen Congyang
2015-06-24 1:11 ` Wen Congyang
2015-06-23 6:44 ` Wen Congyang
2015-06-18 8:49 ` [Qemu-devel] [PATCH COLO-Block v6 08/16] NBD client: implement block driver interfaces to connect/disconnect NBD server Wen Congyang
2015-06-18 8:49 ` [Qemu-devel] [PATCH COLO-Block v6 09/16] Introduce a new -drive option to control whether to connect to remote target Wen Congyang
2015-06-18 8:49 ` [Qemu-devel] [PATCH COLO-Block v6 10/16] NBD client: connect to nbd server later Wen Congyang
2015-06-18 8:49 ` [Qemu-devel] [PATCH COLO-Block v6 11/16] Add new block driver interfaces to control block replication Wen Congyang
2015-06-18 8:49 ` [Qemu-devel] [PATCH COLO-Block v6 12/16] skip nbd_target when starting " Wen Congyang
2015-06-18 8:49 ` [Qemu-devel] [PATCH COLO-Block v6 13/16] quorum: implement block driver interfaces for " Wen Congyang
2015-06-18 13:06 ` Stefan Hajnoczi
2015-06-18 8:49 ` [Qemu-devel] [PATCH COLO-Block v6 14/16] introduce a new API qemu_opts_absorb_qdict_by_index() Wen Congyang
2015-06-18 8:49 ` [Qemu-devel] [PATCH COLO-Block v6 15/16] quorum: allow ignoring child errors Wen Congyang
2015-06-18 13:06 ` Stefan Hajnoczi
2015-06-18 8:49 ` [Qemu-devel] [PATCH COLO-Block v6 16/16] Implement new driver for block replication Wen Congyang
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