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From: Vitaly Ostanin <vyt@altlinux.org>
To: ALT Linux Team development discussions <devel@lists.altlinux.org>
Subject: Re: [devel] dump/restore в rescue
Date: Mon, 14 Jan 2008 13:55:56 +0300
Message-ID: <478B3FBC.2060907@altlinux.org> (raw)
In-Reply-To: <20080114065213.GA28583@mw.local.seiros.ru>

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Денис Смирнов пишет:
> On Thu, Jan 10, 2008 at 02:59:57PM +0600, Ildar Mulyukov wrote:
> 
> IM> Нет. LVM делает snapshot своими средствами на уровне блоков. Какая там  
> IM> файловая система - совершенно всё равно, хоть NTFS ;)
> 
> Вот именно потому что делает на уровне блоков и нужно чтобы FS умела быть
> одновременно неотмонтированной и консистентной.

Говорят, большинство FS умеет, см.
http://tldp.org/HOWTO/LVM-HOWTO/snapshotintro.html

"This facility does require that the snapshot be made at a time
when the data on the logical volume is in a consistent state -
the VFS-lock patch for LVM1 makes sure that some filesystems do
this automatically when a snapshot is created, and many of the
filesystems in the 2.6 kernel do this automatically when a
snapshot is created without patching."

Но вы меня озадачили. Дело в том, что в нашем случае разделом с
FS управляет lvm из xen dom0, а самой FS - domU. И при создании
snapshot в dom0 ядро domU не знает, что ему нужно звать vfs lock.

Продолжаем раскопки...

<skipped/>

-- 
Regards, Vyt
mailto:  vyt@altlinux.org
JID:     vitaly.ostanin@gmail.com


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  reply	other threads:[~2008-01-14 10:55 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-12-28 13:42 Vitaly Ostanin
2007-12-31  8:48 ` Michael Shigorin
2008-01-02 14:01   ` Vitaly Ostanin
2008-01-02 15:37     ` Michael Shigorin
2008-01-02 16:08       ` Vitaly Ostanin
2008-01-02 17:22         ` Денис Смирнов
2008-01-03 14:54         ` Michael Shigorin
2008-01-08  9:55           ` Victor Forsyuk
2008-01-08 10:20             ` Vitaly Ostanin
2008-01-10  8:26               ` Eugene Prokopiev
2008-01-10  8:59                 ` Ildar Mulyukov
2008-01-14  6:52                   ` Денис Смирнов
2008-01-14 10:55                     ` Vitaly Ostanin [this message]
2008-01-14 11:31                       ` Vitaly Ostanin

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