From: Markus Armbruster <armbru@redhat.com>
To: Stefan Hajnoczi <stefanha@gmail.com>
Cc: kwolf@redhat.com,
Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>,
Fam Zheng <famz@redhat.com>, "Denis V. Lunev" <den@virtuozzo.com>,
qemu-devel@nongnu.org, jsnow@redhat.com
Subject: Re: [Qemu-devel] [PATCH v2 0/6] external backup api
Date: Thu, 18 Feb 2016 18:07:45 +0100 [thread overview]
Message-ID: <87a8my6j6m.fsf@blackfin.pond.sub.org> (raw)
In-Reply-To: <20160218163914.GA13271@stefanha-x1.localdomain> (Stefan Hajnoczi's message of "Thu, 18 Feb 2016 16:39:14 +0000")
Stefan Hajnoczi <stefanha@gmail.com> writes:
> On Tue, Feb 16, 2016 at 08:20:44PM +0300, Denis V. Lunev wrote:
>> the idea seems feasible at the first glance. I'll need to check
>> the amount of the overhead of this approach. If we'll need
>> to perform an additional request for each <granularity>
>> block - the overhead is toooooo much.
>
> Regarding overhead, thankfully it's not one-block-at-a-time :).
>
>> Do you have the link to the spec/implementation?
>
> You can reference SCSI Block Commands (SBC-3) 5.4 GET LBA STATUS
> command. The filename is sbc3r25.pdf and it's available from t10.org
> although other sites seem to host copies too.
>
> The approach is similar to the QMP command you have proposed. Input
> parameters are "starting LBA" and "allocation length". Outputs are a
> list of "status descriptors" which consists of an LBA, number of blocks,
> and a provisioning status field (allocated/unallocated/etc).
>
> This means a single call can retrieve information for a whole range of
> the disk. It's slightly more efficient than QMP since the data is
> binary and not JSON text.
Moreover, it avoids abusing control-plane QMP as data plane.
next prev parent reply other threads:[~2016-02-18 17:07 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-30 10:56 [Qemu-devel] [PATCH v2 0/6] external backup api Vladimir Sementsov-Ogievskiy
2016-01-30 10:56 ` [Qemu-devel] [PATCH 1/6] block dirty bitmap: add next_zero function Vladimir Sementsov-Ogievskiy
2016-01-30 10:56 ` [Qemu-devel] [PATCH 2/6] qmp: add query-block-dirty-bitmap-ranges Vladimir Sementsov-Ogievskiy
2016-02-10 10:08 ` Stefan Hajnoczi
2016-02-10 13:57 ` Denis V. Lunev
2016-02-10 15:26 ` John Snow
2016-02-10 15:36 ` Denis V. Lunev
2016-02-10 15:37 ` John Snow
2016-02-10 15:40 ` Denis V. Lunev
2016-02-14 5:05 ` Fam Zheng
2016-01-30 10:56 ` [Qemu-devel] [PATCH 3/6] iotests: test query-block-dirty-bitmap-ranges Vladimir Sementsov-Ogievskiy
2016-01-30 10:56 ` [Qemu-devel] [PATCH 4/6] qapi: add qmp commands for some dirty bitmap functions Vladimir Sementsov-Ogievskiy
2016-01-30 10:56 ` [Qemu-devel] [PATCH 5/6] qapi: make block-dirty-bitmap-create-successor transaction-able Vladimir Sementsov-Ogievskiy
2016-01-30 10:56 ` [Qemu-devel] [PATCH 6/6] iotests: test external backup api Vladimir Sementsov-Ogievskiy
2016-02-03 8:14 ` [Qemu-devel] [PATCH v2 0/6] " Fam Zheng
2016-02-03 10:57 ` Vladimir Sementsov-Ogievskiy
2016-02-03 11:02 ` Fam Zheng
2016-02-03 11:24 ` Vladimir Sementsov-Ogievskiy
2016-02-05 8:28 ` Denis V. Lunev
2016-02-05 8:44 ` Fam Zheng
2016-02-09 14:21 ` Stefan Hajnoczi
2016-02-09 14:37 ` Denis V. Lunev
2016-02-09 16:49 ` John Snow
2016-02-09 16:58 ` Denis V. Lunev
2016-02-09 18:12 ` John Snow
2016-02-09 19:25 ` Denis V. Lunev
2016-02-10 8:04 ` Denis V. Lunev
2016-02-09 14:28 ` Stefan Hajnoczi
2016-02-09 14:41 ` Denis V. Lunev
2016-02-10 10:10 ` Stefan Hajnoczi
2016-02-16 17:09 ` Stefan Hajnoczi
2016-02-16 17:17 ` Vladimir Sementsov-Ogievskiy
2016-02-16 17:20 ` Denis V. Lunev
2016-02-18 16:39 ` Stefan Hajnoczi
2016-02-18 17:07 ` Markus Armbruster [this message]
2016-02-17 17:47 ` Vladimir Sementsov-Ogievskiy
2016-02-18 0:59 ` Fam Zheng
2016-02-18 12:11 ` Daniel P. Berrange
2016-02-18 16:41 ` Stefan Hajnoczi
2016-02-19 2:08 ` Fam Zheng
2016-02-19 8:51 ` Markus Armbruster
2016-02-24 23:34 ` John Snow
2016-02-26 19:55 ` Paolo Bonzini
2016-02-26 20:03 ` Paolo Bonzini
2016-02-26 20:29 ` Denis V. Lunev
2016-02-26 21:37 ` John Snow
2016-02-26 20:40 ` Denis V. Lunev
2016-02-27 4:26 ` Fam Zheng
2016-02-29 8:14 ` Markus Armbruster
2016-02-29 8:54 ` Paolo Bonzini
2016-02-29 9:42 ` Paolo Bonzini
2016-02-29 10:05 ` Fam Zheng
2016-03-10 17:37 ` Stefan Hajnoczi
2016-03-10 17:40 ` Paolo Bonzini
2016-03-14 16:27 ` Denis V. Lunev
2016-02-29 10:22 ` Markus Armbruster
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