From: Wen Congyang <wency@cn.fujitsu.com>
To: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
Ian Jackson <Ian.Jackson@eu.citrix.com>
Cc: Lars Kurth <lars.kurth@citrix.com>,
Changlong Xie <xiecl.fnst@cn.fujitsu.com>,
Wei Liu <wei.liu2@citrix.com>,
Ian Campbell <ian.campbell@citrix.com>,
Andrew Cooper <andrew.cooper3@citrix.com>,
Jiang Yunhong <yunhong.jiang@intel.com>,
Dong Eddie <eddie.dong@intel.com>,
xen devel <xen-devel@lists.xen.org>,
Anthony Perard <anthony.perard@citrix.com>,
Gui Jianfeng <guijianfeng@cn.fujitsu.com>,
Shriram Rajagopalan <rshriram@cs.ubc.ca>,
Yang Hongyang <hongyang.yang@easystack.cn>
Subject: Re: [PATCH v11 20/27] Support colo mode for qemu disk
Date: Mon, 7 Mar 2016 10:10:07 +0800 [thread overview]
Message-ID: <56DCE2FF.7060905@cn.fujitsu.com> (raw)
In-Reply-To: <20160304203039.GI21173@char.us.oracle.com>
On 03/05/2016 04:30 AM, Konrad Rzeszutek Wilk wrote:
> On Fri, Mar 04, 2016 at 05:52:09PM +0000, Ian Jackson wrote:
>> Changlong Xie writes ("[PATCH v11 20/27] Support colo mode for qemu disk"):
>>> +Enable COLO HA for disk. For better understanding block replication on
>>> +QEMU, please refer to:
>>> +http://wiki.qemu.org/Features/BlockReplication
>>
>> Sorry, I missed this link on my first pass. I still think that at the
>> very least this needs something more user-facing (ie, how should one
>> set this up).
>>
>> But, I'm kind of worried that qemu is the wrong place to be doing
>> this.
>>
>> How can this be made to work with PV guests ?
>
> QEMU can also serve PV guests (qdisk).
>
> I think your question is more of - what about making this work with
> PV block backend?
I don't know how to work with PV block backend. It is one reason that
why we only support pure HVM now.
For PV block backend, there is also other problem. For exampe resuming
it in the secondary side is very slow, because we need to disconnect and
reconnect.
Thanks
Wen Congyang
>>
>> What if an HVM guest has PV-on-HVM drivers ? In this case there might
>> be two relevant qemus, one for the qdisk Xen PV block backend, and one
>> for the emulated IDE.
>
> In both cases QEMU would use the same underlaying API to actually write/read
> out the blocks. That API would then use NBD, etc to replicate writes.
>
> Maybe a little ASCII art?
>
> qdisk ide
> \ /
> \ /
> block API
> |
> QCOW2
> |
> NBD
>
> Or such?
>
>>
>> I don't understand how discrepant writes are detected. Surely they
>> might occur and should trigger a resynch ?
>>
>> Ian.
>
>
> .
>
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next prev parent reply other threads:[~2016-03-07 2:10 UTC|newest]
Thread overview: 100+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-04 8:41 [PATCH v11 00/27] COarse-grain LOck-stepping Virtual Machines for Non-stop Service Changlong Xie
2016-03-04 8:41 ` [PATCH v11 01/27] tools/libxl: introduction of libxl__qmp_restore to load qemu state Changlong Xie
2016-03-04 16:30 ` Ian Jackson
2016-03-14 9:03 ` Changlong Xie
2016-03-04 8:41 ` [PATCH v11 02/27] tools/libxl: introduce libxl__domain_common_switch_qemu_logdirty() Changlong Xie
2016-03-04 8:41 ` [PATCH v11 03/27] tools/libxl: Add back channel to allow migration target send data back Changlong Xie
2016-03-04 16:38 ` Ian Jackson
2016-03-08 16:38 ` Wei Liu
2016-03-17 8:07 ` Changlong Xie
2016-03-04 8:41 ` [PATCH v11 04/27] tools/libxl: Introduce new helper function dup_fd_helper() Changlong Xie
2016-03-04 16:42 ` Ian Jackson
2016-03-17 8:08 ` Changlong Xie
2016-03-04 8:41 ` [PATCH v11 05/27] tools/libx{l, c}: add back channel to libxc Changlong Xie
2016-03-04 16:45 ` Ian Jackson
2016-03-04 8:41 ` [PATCH v11 06/27] docs: add colo readme Changlong Xie
2016-03-04 8:41 ` [PATCH v11 07/27] docs/libxl: Introduce CHECKPOINT_CONTEXT to support migration v2 colo streams Changlong Xie
2016-03-04 16:51 ` Ian Jackson
2016-03-08 16:38 ` Wei Liu
2016-03-11 7:13 ` Wen Congyang
2016-03-04 8:41 ` [PATCH v11 08/27] libxc/migration: Specification update for DIRTY_PFN_LIST records Changlong Xie
2016-03-04 16:53 ` Ian Jackson
2016-03-17 8:10 ` Changlong Xie
2016-03-04 8:41 ` [PATCH v11 09/27] libxc/migration: export read_record for common use Changlong Xie
2016-03-04 16:55 ` Ian Jackson
2016-03-04 8:41 ` [PATCH v11 10/27] tools/libxl: add back channel support to write stream Changlong Xie
2016-03-04 17:00 ` Ian Jackson
2016-03-07 2:13 ` Wen Congyang
2016-03-11 9:05 ` Wen Congyang
2016-03-17 8:11 ` Changlong Xie
2016-03-04 8:41 ` [PATCH v11 11/27] tools/libxl: add back channel support to read stream Changlong Xie
2016-03-04 17:01 ` Ian Jackson
2016-03-04 8:41 ` [PATCH v11 12/27] tools/libx{l, c}: introduce wait_checkpoint callback Changlong Xie
2016-03-04 17:03 ` Ian Jackson
2016-03-04 20:23 ` Konrad Rzeszutek Wilk
2016-03-07 2:16 ` Wen Congyang
2016-03-17 8:16 ` Changlong Xie
2016-03-04 8:41 ` [PATCH v11 13/27] tools/libx{l, c}: add postcopy/suspend callback to restore side Changlong Xie
2016-03-04 17:05 ` Ian Jackson
2016-03-17 8:17 ` Changlong Xie
2016-03-04 8:41 ` [PATCH v11 14/27] secondary vm suspend/resume/checkpoint code Changlong Xie
2016-03-04 17:11 ` Ian Jackson
2016-03-07 2:57 ` Wen Congyang
2016-03-17 9:03 ` Changlong Xie
2016-03-17 12:19 ` Wei Liu
2016-03-04 8:41 ` [PATCH v11 15/27] primary " Changlong Xie
2016-03-04 17:14 ` Ian Jackson
2016-03-07 2:59 ` Wen Congyang
2016-03-04 8:41 ` [PATCH v11 16/27] libxc/restore: support COLO restore Changlong Xie
2016-03-04 17:16 ` Ian Jackson
2016-03-04 8:41 ` [PATCH v11 17/27] libxc/save: support COLO save Changlong Xie
2016-03-04 17:18 ` Ian Jackson
2016-03-07 3:00 ` Wen Congyang
2016-03-04 8:41 ` [PATCH v11 18/27] implement the cmdline for COLO Changlong Xie
2016-03-04 17:22 ` Ian Jackson
2016-03-07 3:04 ` Wen Congyang
2016-03-04 8:41 ` [PATCH v11 19/27] COLO: introduce new API to prepare/start/do/get_error/stop replication Changlong Xie
2016-03-04 17:26 ` Ian Jackson
2016-03-08 16:46 ` Wei Liu
2016-03-18 3:44 ` Changlong Xie
2016-03-18 11:35 ` Wei Liu
2016-03-18 3:45 ` Changlong Xie
2016-03-04 17:29 ` Ian Jackson
2016-03-18 3:49 ` Changlong Xie
2016-03-04 8:41 ` [PATCH v11 20/27] Support colo mode for qemu disk Changlong Xie
2016-03-04 17:44 ` Ian Jackson
2016-03-07 2:06 ` Wen Congyang
2016-03-17 17:18 ` Ian Jackson
2016-03-18 5:42 ` Wen Congyang
2016-03-04 17:52 ` Ian Jackson
2016-03-04 20:30 ` Konrad Rzeszutek Wilk
2016-03-07 2:10 ` Wen Congyang [this message]
2016-03-08 17:22 ` Wei Liu
2016-03-09 2:09 ` Konrad Rzeszutek Wilk
2016-03-09 16:55 ` Wei Liu
2016-03-17 17:09 ` Ian Jackson
2016-03-17 17:10 ` Ian Jackson
2016-03-04 8:41 ` [PATCH v11 21/27] COLO: use qemu block replication Changlong Xie
2016-03-04 8:41 ` [PATCH v11 22/27] COLO proxy: implement setup/teardown of COLO proxy module Changlong Xie
2016-03-04 17:59 ` Ian Jackson
2016-03-18 8:22 ` Changlong Xie
2016-03-22 5:44 ` Changlong Xie
2016-03-22 5:55 ` Changlong Xie
2016-03-04 8:41 ` [PATCH v11 23/27] COLO proxy: preresume, postresume and checkpoint Changlong Xie
2016-03-04 18:01 ` Ian Jackson
2016-03-18 8:20 ` Changlong Xie
2016-03-04 8:41 ` [PATCH v11 24/27] COLO nic: implement COLO nic subkind Changlong Xie
2016-03-04 18:02 ` Ian Jackson
2016-03-18 8:20 ` Changlong Xie
2016-03-04 8:41 ` [PATCH v11 25/27] setup and control colo proxy on primary side Changlong Xie
2016-03-04 18:05 ` Ian Jackson
2016-03-22 6:01 ` Changlong Xie
2016-03-04 8:41 ` [PATCH v11 26/27] setup and control colo proxy on secondary side Changlong Xie
2016-03-04 18:05 ` Ian Jackson
2016-03-04 8:41 ` [PATCH v11 27/27] cmdline switches and config vars to control colo-proxy Changlong Xie
2016-03-04 18:09 ` Ian Jackson
2016-03-22 4:13 ` Changlong Xie
2016-03-04 18:17 ` [PATCH v11 00/27] COarse-grain LOck-stepping Virtual Machines for Non-stop Service Ian Jackson
2016-03-04 20:35 ` Konrad Rzeszutek Wilk
2016-03-17 17:19 ` Ian Jackson
2016-03-17 17:41 ` Ian Jackson
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