From: Avi Kivity <avi@redhat.com>
To: Alexander Graf <agraf@suse.de>
Cc: Kevin Wolf <kwolf@redhat.com>,
Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>,
qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [RFC] qed: Add QEMU Enhanced Disk format
Date: Wed, 08 Sep 2010 11:53:54 +0300 [thread overview]
Message-ID: <4C874F22.6060802@redhat.com> (raw)
In-Reply-To: <395D4377-00F9-4765-94C4-470BDFA1F96E@suse.de>
On 09/08/2010 11:41 AM, Alexander Graf wrote:
> On 08.09.2010, at 10:23, Avi Kivity wrote:
>
>> On 09/08/2010 01:27 AM, Anthony Liguori wrote:
>>>> FWIW, L2s are 256K at the moment and with a two level table, it can support 5PB of data.
>>>
>>> I clearly suck at basic math today. The image supports 64TB today. Dropping to 128K tables would reduce it to 16TB and 64k tables would be 4TB.
>> Maybe we should do three levels then. Some users are bound to complain about 64TB.
> Why 3 levels? Can't the L2 size be dynamic? Then big images get a big L2 map while small images get a smaller one.
>
Dunno, just seems more regular to me. Image resize doesn't need to
relocate the L2 table in case it overflows.
The overhead from three levels is an extra table, which is negligible.
With 64K tables, the maximum image size is 32PiB, which is 14 bits away
from a 2TB disk, giving us about 30 years.
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain. q
next prev parent reply other threads:[~2010-09-08 8:54 UTC|newest]
Thread overview: 132+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-06 10:04 [Qemu-devel] [RFC] qed: Add QEMU Enhanced Disk format Stefan Hajnoczi
2010-09-06 10:25 ` Alexander Graf
2010-09-06 10:31 ` Stefan Hajnoczi
2010-09-06 14:21 ` Luca Tettamanti
2010-09-06 14:24 ` Alexander Graf
2010-09-06 16:27 ` Anthony Liguori
2010-09-06 10:27 ` [Qemu-devel] " Kevin Wolf
2010-09-06 12:40 ` Stefan Hajnoczi
2010-09-06 12:57 ` Anthony Liguori
2010-09-06 13:02 ` Stefan Hajnoczi
2010-09-06 14:10 ` Kevin Wolf
2010-09-06 16:45 ` Anthony Liguori
2010-09-06 12:45 ` Anthony Liguori
2010-09-10 23:49 ` H. Peter Anvin
2010-09-06 11:18 ` [Qemu-devel] " Daniel P. Berrange
2010-09-06 12:52 ` Anthony Liguori
2010-09-06 13:35 ` Daniel P. Berrange
2010-09-06 16:38 ` Anthony Liguori
2010-09-06 13:06 ` Anthony Liguori
2010-09-07 14:51 ` Avi Kivity
2010-09-07 15:40 ` Anthony Liguori
2010-09-07 16:09 ` Avi Kivity
2010-09-07 16:25 ` Anthony Liguori
2010-09-07 22:27 ` Anthony Liguori
2010-09-08 8:23 ` Avi Kivity
2010-09-08 8:41 ` Alexander Graf
2010-09-08 8:53 ` Avi Kivity [this message]
2010-09-08 11:15 ` Stefan Hajnoczi
2010-09-08 15:38 ` Christoph Hellwig
2010-09-08 16:30 ` Anthony Liguori
2010-09-08 20:23 ` Christoph Hellwig
2010-09-08 20:28 ` Anthony Liguori
2010-09-09 2:35 ` Christoph Hellwig
2010-09-09 6:24 ` Avi Kivity
2010-09-09 21:01 ` Christoph Hellwig
2010-09-10 11:15 ` Avi Kivity
2010-09-09 6:53 ` Avi Kivity
2010-09-10 21:22 ` Jamie Lokier
2010-09-14 10:46 ` Stefan Hajnoczi
2010-09-14 11:08 ` Stefan Hajnoczi
2010-09-14 12:54 ` Anthony Liguori
2010-09-08 12:55 ` Anthony Liguori
2010-09-09 6:30 ` Avi Kivity
2010-09-08 12:48 ` Anthony Liguori
2010-09-08 13:20 ` Kevin Wolf
2010-09-08 13:26 ` Anthony Liguori
2010-09-08 13:46 ` Kevin Wolf
2010-09-09 6:45 ` Avi Kivity
2010-09-09 6:48 ` Avi Kivity
2010-09-09 12:49 ` Anthony Liguori
2010-09-09 16:48 ` [Qemu-devel] " Paolo Bonzini
2010-09-09 17:02 ` Anthony Liguori
2010-09-09 20:56 ` Christoph Hellwig
2010-09-10 10:53 ` Avi Kivity
2010-09-10 11:14 ` [Qemu-devel] " Avi Kivity
2010-09-10 11:25 ` Avi Kivity
2010-09-10 11:33 ` Stefan Hajnoczi
2010-09-10 11:43 ` Avi Kivity
2010-09-10 13:22 ` Anthony Liguori
2010-09-10 13:48 ` Christoph Hellwig
2010-09-10 15:02 ` Anthony Liguori
2010-09-10 15:18 ` Kevin Wolf
2010-09-10 15:53 ` Anthony Liguori
2010-09-10 16:05 ` Kevin Wolf
2010-09-10 17:10 ` Anthony Liguori
2010-09-10 17:44 ` Kevin Wolf
2010-09-10 17:46 ` Miguel Di Ciurcio Filho
2010-09-10 14:02 ` Avi Kivity
2010-09-10 13:47 ` Christoph Hellwig
2010-09-10 14:05 ` Avi Kivity
2010-09-10 14:12 ` Christoph Hellwig
2010-09-10 14:24 ` Avi Kivity
2010-09-10 13:16 ` Anthony Liguori
2010-09-10 14:06 ` Avi Kivity
2010-09-10 11:43 ` Stefan Hajnoczi
2010-09-10 12:06 ` Avi Kivity
2010-09-10 13:28 ` Anthony Liguori
2010-09-10 12:12 ` Kevin Wolf
2010-09-10 12:35 ` Stefan Hajnoczi
2010-09-10 12:47 ` Avi Kivity
2010-09-10 13:10 ` Stefan Hajnoczi
2010-09-10 13:19 ` Avi Kivity
2010-09-10 13:39 ` Anthony Liguori
2010-09-10 13:52 ` Christoph Hellwig
2010-09-10 13:56 ` Avi Kivity
2010-09-10 13:48 ` Kevin Wolf
2010-09-10 13:14 ` Anthony Liguori
2010-09-10 13:47 ` Avi Kivity
2010-09-10 14:56 ` Anthony Liguori
2010-09-10 15:49 ` Avi Kivity
2010-09-10 17:07 ` Anthony Liguori
2010-09-10 17:42 ` Kevin Wolf
2010-09-10 19:33 ` Anthony Liguori
2010-09-13 10:41 ` Kevin Wolf
2010-09-12 13:24 ` Avi Kivity
2010-09-12 15:13 ` Anthony Liguori
2010-09-12 15:56 ` Avi Kivity
2010-09-12 17:09 ` Anthony Liguori
2010-09-12 17:51 ` Avi Kivity
2010-09-12 20:18 ` Anthony Liguori
2010-09-13 9:24 ` Avi Kivity
2010-09-13 11:28 ` Kevin Wolf
2010-09-13 11:34 ` Avi Kivity
2010-09-13 11:48 ` Kevin Wolf
2010-09-13 13:19 ` Anthony Liguori
2010-09-13 13:12 ` Anthony Liguori
2010-09-13 11:03 ` Kevin Wolf
2010-09-13 13:07 ` Anthony Liguori
2010-09-13 13:24 ` Kevin Wolf
2010-09-07 16:12 ` Anthony Liguori
2010-09-07 21:35 ` Christoph Hellwig
2010-09-07 22:29 ` Anthony Liguori
2010-09-07 22:40 ` Christoph Hellwig
2010-09-08 15:07 ` Stefan Hajnoczi
2010-09-09 6:59 ` Avi Kivity
2010-09-09 17:43 ` Anthony Liguori
2010-09-09 20:46 ` Christoph Hellwig
2010-09-10 11:22 ` Avi Kivity
2010-09-10 11:29 ` Stefan Hajnoczi
2010-09-10 11:37 ` Avi Kivity
2010-09-07 13:58 ` Avi Kivity
2010-09-07 19:25 ` Blue Swirl
2010-09-07 20:41 ` Anthony Liguori
2010-09-08 7:48 ` Kevin Wolf
2010-09-08 15:37 ` Stefan Hajnoczi
2010-09-08 18:24 ` Blue Swirl
2010-09-08 18:35 ` Anthony Liguori
2010-09-08 18:56 ` Blue Swirl
2010-09-08 19:19 ` Anthony Liguori
2010-09-15 21:01 ` [Qemu-devel] " Michael S. Tsirkin
2010-09-15 21:12 ` Anthony Liguori
-- strict thread matches above, loose matches on Subject: below --
2010-09-17 3:51 [Qemu-devel] " Khoa Huynh
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