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List: webmin-l
Subject: Re: [webmin-l] virtualmin - move all domains to new server
From: Pat Erler <perler () gmail ! com>
Date: 2013-03-13 18:14:41
Message-ID: CAHk2_+jnOSVLJaEc-SZYPEghNs4_uphtObBypk4q1q=qGeF_Yw () mail ! gmail ! com
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ok, thanks for the warning, I will do a test on another virtual disk to get
an estimate how long it will take. it's definitely easier to do a dd then
setting up an empty system and copying the data, also from a consistency
point of view, IMO..
On Wed, Mar 13, 2013 at 3:35 PM, Andrey Repin <anrdaemon@freemail.ru> wrote:
> Greetings, Webmin users list!
>
> > ok, this is a brillant idea (stupid me..) - I will give it a try tonight,
> > anything to watch for when cloning?
>
> Don't make haste, and make sure your backup is up to date :)
>
> > this should work:
> >
> http://www.howtogeek.com/howto/19141/clone-a-hard-drive-using-an-ubuntu-live-cd/
> > ?
>
> Yes and no. Yes, in essence, it's the right thing to do. No, because it
> doesn't mention some caveats necessary when working with filesystems on low
> level.
> I would recommend to use
> dd if=... of=... iflag=direct oflag=direct bs=$((4096*1024))
> Means, to use direct IO (to ensure no effect from OS caching layer), and
> use
> 4Mb (4096*1024) size blocks to read and write data. Bigger block IO is
> faster,
> than using default 512b block. (Also, you don't want to use blocks smaller,
> than 4096b anyway, as your FS is based on them)
> Be aware, that no matter, how optimal is the blocks size you choose,
> copying
> 1Tb of data would likely take a very, very, very long time.
> To check the progress (or to have a running readout), you can send USR1 to
> a
> running dd process.
> Or use this monstrocity of shell script:
> dd .... & PID=$! ; sleep 10 ; while kill -USR1 $PID ; do sleep 10 ; done
>
> I have to restate the forewarning given in the article you mentioned: DD
> is a
> very powerful tool, you can destroy your system as easy, as save it.
> If there's no necessity in using DD (you aren't rescuing a dying HDD or
> something to that extent), I'd advise on using
> cp -axt /mnt/dest /mnt/src/*
> , it'll also save your time, as it'll only clone your data.
>
> > PAT
>
>
> > On Wed, Mar 13, 2013 at 10:10 AM, Andrey Repin <anrdaemon@freemail.ru
> >wrote:
>
> >> Greetings, Webmin users list!
> >>
> >> > problem is, that the VM isn't cloning anymore on the host level (some
> >> > internal exi probblem,
> >> > http://communities.vmware.com/message/2209760#2209760if you are
> >> > interested) ), but it still runs and I'm be able to rsync/backup
> >> > everything.
> >>
> >> If you have free space to duplicate whole VM disks, you can just add a
> new
> >> disks and boot VM from LiveCD. From there, it is a simple case of using
> dd
> >> to
> >> duplicate the partitions.
> >>
> >> > I'm a bit sceptical of rsyncing the *whole* VM - but you would suggest
> >> > this? like excluding /tmp /dev/ /proc and rsync over everything?
> >>
> >> rsync, much like cp, have option to "stay on same filesystem".
> >>
> >>
> >> --
> >> WBR,
> >> Andrey Repin (anrdaemon@freemail.ru) 13.03.2013, <13:06>
> >>
> >> Sorry for my terrible english...
> >>
> >>
> >>
> >>
> ------------------------------------------------------------------------------
> >> Everyone hates slow websites. So do we.
> >> Make your web apps faster with AppDynamics
> >> Download AppDynamics Lite for free today:
> >> http://p.sf.net/sfu/appdyn_d2d_mar
> >> -
> >> Forwarded by the Webmin mailing list at
> >> webadmin-list@lists.sourceforge.net
> >> To remove yourself from this list, go to
> >> http://lists.sourceforge.net/lists/listinfo/webadmin-list
> >>
>
>
>
>
>
> --
> WBR,
> Andrey Repin (anrdaemon@freemail.ru) 13.03.2013, <18:06>
>
> Sorry for my terrible english...
>
>
>
> ------------------------------------------------------------------------------
> Everyone hates slow websites. So do we.
> Make your web apps faster with AppDynamics
> Download AppDynamics Lite for free today:
> http://p.sf.net/sfu/appdyn_d2d_mar
> -
> Forwarded by the Webmin mailing list at
> webadmin-list@lists.sourceforge.net
> To remove yourself from this list, go to
> http://lists.sourceforge.net/lists/listinfo/webadmin-list
>
--
*Pat Erler*
Gtalk/G+: perler@gmail.com
<perler@gmail.com>Skype: pat_erler
[Attachment #5 (text/html)]
<div dir="ltr">ok, thanks for the warning, I will do a test on another virtual disk \
to get an estimate how long it will take. it's definitely easier to do a dd then \
setting up an empty system and copying the data, also from a consistency point of \
view, IMO..<div>
<br></div><div><br></div></div><div class="gmail_extra"><br><br><div \
class="gmail_quote">On Wed, Mar 13, 2013 at 3:35 PM, Andrey Repin <span \
dir="ltr"><<a href="mailto:anrdaemon@freemail.ru" \
target="_blank">anrdaemon@freemail.ru</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc \
solid;padding-left:1ex">Greetings, Webmin users list!<br> <div class="im"><br>
> ok, this is a brillant idea (stupid me..) - I will give it a try tonight,<br>
> anything to watch for when cloning?<br>
<br>
</div>Don't make haste, and make sure your backup is up to date :)<br>
<div class="im"><br>
> this should work:<br>
> <a href="http://www.howtogeek.com/howto/19141/clone-a-hard-drive-using-an-ubuntu-live-cd/" \
target="_blank">http://www.howtogeek.com/howto/19141/clone-a-hard-drive-using-an-ubuntu-live-cd/</a><br>
> ?<br>
<br>
</div>Yes and no. Yes, in essence, it's the right thing to do. No, because it<br>
doesn't mention some caveats necessary when working with filesystems on low<br>
level.<br>
I would recommend to use<br>
dd if=... of=... iflag=direct oflag=direct bs=$((4096*1024))<br>
Means, to use direct IO (to ensure no effect from OS caching layer), and use<br>
4Mb (4096*1024) size blocks to read and write data. Bigger block IO is faster,<br>
than using default 512b block. (Also, you don't want to use blocks smaller,<br>
than 4096b anyway, as your FS is based on them)<br>
Be aware, that no matter, how optimal is the blocks size you choose, copying<br>
1Tb of data would likely take a very, very, very long time.<br>
To check the progress (or to have a running readout), you can send USR1 to a<br>
running dd process.<br>
Or use this monstrocity of shell script:<br>
dd .... & PID=$! ; sleep 10 ; while kill -USR1 $PID ; do sleep 10 ; done<br>
<br>
I have to restate the forewarning given in the article you mentioned: DD is a<br>
very powerful tool, you can destroy your system as easy, as save it.<br>
If there's no necessity in using DD (you aren't rescuing a dying HDD or<br>
something to that extent), I'd advise on using<br>
cp -axt /mnt/dest /mnt/src/*<br>
, it'll also save your time, as it'll only clone your data.<br>
<div><div class="h5"><br>
> PAT<br>
<br>
<br>
> On Wed, Mar 13, 2013 at 10:10 AM, Andrey Repin <<a \
href="mailto:anrdaemon@freemail.ru">anrdaemon@freemail.ru</a>>wrote:<br> <br>
>> Greetings, Webmin users list!<br>
>><br>
>> > problem is, that the VM isn't cloning anymore on the host level \
(some<br> >> > internal exi probblem,<br>
>> > <a href="http://communities.vmware.com/message/2209760#2209760if" \
target="_blank">http://communities.vmware.com/message/2209760#2209760if</a> you \
are<br> >> > interested) ), but it still runs and I'm be able to \
rsync/backup<br> >> > everything.<br>
>><br>
>> If you have free space to duplicate whole VM disks, you can just add a \
new<br> >> disks and boot VM from LiveCD. From there, it is a simple case of \
using dd<br> >> to<br>
>> duplicate the partitions.<br>
>><br>
>> > I'm a bit sceptical of rsyncing the *whole* VM - but you would \
suggest<br> >> > this? like excluding /tmp /dev/ /proc and rsync over \
everything?<br> >><br>
>> rsync, much like cp, have option to "stay on same filesystem".<br>
>><br>
>><br>
>> --<br>
>> WBR,<br>
>> Andrey Repin (<a \
href="mailto:anrdaemon@freemail.ru">anrdaemon@freemail.ru</a>) 13.03.2013, \
<13:06><br> >><br>
>> Sorry for my terrible english...<br>
>><br>
>><br>
>><br>
>> ------------------------------------------------------------------------------<br>
>> Everyone hates slow websites. So do we.<br>
>> Make your web apps faster with AppDynamics<br>
>> Download AppDynamics Lite for free today:<br>
>> <a href="http://p.sf.net/sfu/appdyn_d2d_mar" \
target="_blank">http://p.sf.net/sfu/appdyn_d2d_mar</a><br> >> -<br>
>> Forwarded by the Webmin mailing list at<br>
>> <a href="mailto:webadmin-list@lists.sourceforge.net">webadmin-list@lists.sourceforge.net</a><br>
>> To remove yourself from this list, go to<br>
>> <a href="http://lists.sourceforge.net/lists/listinfo/webadmin-list" \
target="_blank">http://lists.sourceforge.net/lists/listinfo/webadmin-list</a><br> \
>><br> <br>
<br>
<br>
<br>
<br>
--<br>
WBR,<br>
</div></div>Andrey Repin (<a \
href="mailto:anrdaemon@freemail.ru">anrdaemon@freemail.ru</a>) 13.03.2013, \
<18:06><br> <div class="HOEnZb"><div class="h5"><br>
Sorry for my terrible english...<br>
<br>
<br>
------------------------------------------------------------------------------<br>
Everyone hates slow websites. So do we.<br>
Make your web apps faster with AppDynamics<br>
Download AppDynamics Lite for free today:<br>
<a href="http://p.sf.net/sfu/appdyn_d2d_mar" \
target="_blank">http://p.sf.net/sfu/appdyn_d2d_mar</a><br>
-<br>
Forwarded by the Webmin mailing list at <a \
href="mailto:webadmin-list@lists.sourceforge.net">webadmin-list@lists.sourceforge.net</a><br>
To remove yourself from this list, go to<br>
<a href="http://lists.sourceforge.net/lists/listinfo/webadmin-list" \
target="_blank">http://lists.sourceforge.net/lists/listinfo/webadmin-list</a><br> \
</div></div></blockquote></div><br><br clear="all"><div><br></div>-- <br><b>Pat \
Erler</b> <div>Gtalk/G+: <a href="mailto:perler@gmail.com" \
target="_blank">perler@gmail.com</a></div><div><a href="mailto:perler@gmail.com" \
target="_blank"></a>Skype: pat_erler</div>
</div>
------------------------------------------------------------------------------
Everyone hates slow websites. So do we.
Make your web apps faster with AppDynamics
Download AppDynamics Lite for free today:
http://p.sf.net/sfu/appdyn_d2d_mar
-
Forwarded by the Webmin mailing list at webadmin-list@lists.sourceforge.net
To remove yourself from this list, go to
http://lists.sourceforge.net/lists/listinfo/webadmin-list
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