RE: Question about OCFS1/2

RE: Question about OCFS1/2

[Ian Pratt]

> Just curious, what version of LVM are you using where snapshots are, 
> uhm, reliable :-).

LVM snapshots work OK providing you a) use them as read-only backups,
and b) make sure you allocate them enough disk space such that there's
no danger of the snapshot filling.

I wouldn't recommend using them to do CoW guest file systems, at least
in a production environemnt.

Ian


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Re: Question about OCFS1/2

[Justin Dearing]

So I can create and mount a snapshot on the host OS of a LVM partition
that is being mounted RW by the guest OS (naturalyl the guest sees
them as /dev/hda* to minimize my confusion)?  Theres no data integrity
issues there?


On Wed, 16 Feb 2005 22:37:33 -0000, Ian Pratt <m+Ian.Pratt@cl.cam.ac.uk> wrote:
> 
> > Just curious, what version of LVM are you using where snapshots are,
> > uhm, reliable :-).
> 
> LVM snapshots work OK providing you a) use them as read-only backups,
> and b) make sure you allocate them enough disk space such that there's
> no danger of the snapshot filling.
> 
> I wouldn't recommend using them to do CoW guest file systems, at least
> in a production environemnt.
> 
> Ian
>


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Re: Question about OCFS1/2

[Justin Dearing]

Wait the xen kernel is 2.6 and the LVM howto and the errors I get from
lvcreate -s indicate that I can't do snapshots on 2.6 becasue LVM2
doenst support snapshots yet.  I think I'm back to using a clustering
file system to enable backups..


On Thu, 17 Feb 2005 11:15:40 -0500, Justin Dearing <zippy1981@gmail.com> wrote:
> So I can create and mount a snapshot on the host OS of a LVM partition
> that is being mounted RW by the guest OS (naturalyl the guest sees
> them as /dev/hda* to minimize my confusion)?  Theres no data integrity
> issues there?
> 
> 
> On Wed, 16 Feb 2005 22:37:33 -0000, Ian Pratt <m+Ian.Pratt@cl.cam.ac.uk> wrote:
> >
> > > Just curious, what version of LVM are you using where snapshots are,
> > > uhm, reliable :-).
> >
> > LVM snapshots work OK providing you a) use them as read-only backups,
> > and b) make sure you allocate them enough disk space such that there's
> > no danger of the snapshot filling.
> >
> > I wouldn't recommend using them to do CoW guest file systems, at least
> > in a production environemnt.
> >
> > Ian
> >
>


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Re: Question about OCFS1/2

[Wim Coekaerts]

m thinking of adding ocfs2 nightly qa type runs in xen going forward. it
is a good idea snapshots need more space.

wim

On Thu, Feb 17, 2005 at 11:48:09AM -0500, Justin Dearing wrote:
> Wait the xen kernel is 2.6 and the LVM howto and the errors I get from
> lvcreate -s indicate that I can't do snapshots on 2.6 becasue LVM2
> doenst support snapshots yet.  I think I'm back to using a clustering
> file system to enable backups..
> 
> 
> On Thu, 17 Feb 2005 11:15:40 -0500, Justin Dearing <zippy1981@gmail.com> wrote:
> > So I can create and mount a snapshot on the host OS of a LVM partition
> > that is being mounted RW by the guest OS (naturalyl the guest sees
> > them as /dev/hda* to minimize my confusion)?  Theres no data integrity
> > issues there?
> > 
> > 
> > On Wed, 16 Feb 2005 22:37:33 -0000, Ian Pratt <m+Ian.Pratt@cl.cam.ac.uk> wrote:
> > >
> > > > Just curious, what version of LVM are you using where snapshots are,
> > > > uhm, reliable :-).
> > >
> > > LVM snapshots work OK providing you a) use them as read-only backups,
> > > and b) make sure you allocate them enough disk space such that there's
> > > no danger of the snapshot filling.
> > >
> > > I wouldn't recommend using them to do CoW guest file systems, at least
> > > in a production environemnt.
> > >
> > > Ian
> > >
> >
> 
> 
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Re: Question about OCFS1/2

[Justin Dearing]

Wim, 

Are you saying your going to provide nightly snapshopt os XEN with
ocfs modules built or is this "nightly qa type run" talk refer to some
ocfs  maintaince procedute I'm unaware of?

On Thu, 17 Feb 2005 08:50:39 -0800, Wim Coekaerts
<wim.coekaerts@oracle.com> wrote:
> m thinking of adding ocfs2 nightly qa type runs in xen going forward. it
> is a good idea snapshots need more space.
> 
> wim
> 
> On Thu, Feb 17, 2005 at 11:48:09AM -0500, Justin Dearing wrote:
> > Wait the xen kernel is 2.6 and the LVM howto and the errors I get from
> > lvcreate -s indicate that I can't do snapshots on 2.6 becasue LVM2
> > doenst support snapshots yet.  I think I'm back to using a clustering
> > file system to enable backups..
> >
> >
> > On Thu, 17 Feb 2005 11:15:40 -0500, Justin Dearing <zippy1981@gmail.com> wrote:
> > > So I can create and mount a snapshot on the host OS of a LVM partition
> > > that is being mounted RW by the guest OS (naturalyl the guest sees
> > > them as /dev/hda* to minimize my confusion)?  Theres no data integrity
> > > issues there?
> > >
> > >
> > > On Wed, 16 Feb 2005 22:37:33 -0000, Ian Pratt <m+Ian.Pratt@cl.cam.ac.uk> wrote:
> > > >
> > > > > Just curious, what version of LVM are you using where snapshots are,
> > > > > uhm, reliable :-).
> > > >
> > > > LVM snapshots work OK providing you a) use them as read-only backups,
> > > > and b) make sure you allocate them enough disk space such that there's
> > > > no danger of the snapshot filling.
> > > >
> > > > I wouldn't recommend using them to do CoW guest file systems, at least
> > > > in a production environemnt.
> > > >
> > > > Ian
> > > >
> > >
> >
> >
> > -------------------------------------------------------
> > SF email is sponsored by - The IT Product Guide
> > Read honest & candid reviews on hundreds of IT Products from real users.
> > Discover which products truly live up to the hype. Start reading now.
> > http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/xen-devel
>


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RE: Question about OCFS1/2

[Ian Pratt]

 

> Wait the xen kernel is 2.6 and the LVM howto and the errors I get from
> lvcreate -s indicate that I can't do snapshots on 2.6 becasue LVM2
> doenst support snapshots yet.  I think I'm back to using a clustering
> file system to enable backups..

Snapshots have been in LVM2 since around 2.6.7
Ian

> 
> On Thu, 17 Feb 2005 11:15:40 -0500, Justin Dearing 
> <zippy1981@gmail.com> wrote:
> > So I can create and mount a snapshot on the host OS of a 
> LVM partition
> > that is being mounted RW by the guest OS (naturalyl the guest sees
> > them as /dev/hda* to minimize my confusion)?  Theres no 
> data integrity
> > issues there?
> > 
> > 
> > On Wed, 16 Feb 2005 22:37:33 -0000, Ian Pratt 
> <m+Ian.Pratt@cl.cam.ac.uk> wrote:
> > >
> > > > Just curious, what version of LVM are you using where 
> snapshots are,
> > > > uhm, reliable :-).
> > >
> > > LVM snapshots work OK providing you a) use them as 
> read-only backups,
> > > and b) make sure you allocate them enough disk space such 
> that there's
> > > no danger of the snapshot filling.
> > >
> > > I wouldn't recommend using them to do CoW guest file 
> systems, at least
> > > in a production environemnt.
> > >
> > > Ian
> > >
> >
> 
> 
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> Xen-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/xen-devel
> 


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RE: Question about OCFS1/2

[Ian Pratt]

> So I can create and mount a snapshot on the host OS of a LVM partition
> that is being mounted RW by the guest OS (naturalyl the guest sees
> them as /dev/hda* to minimize my confusion)?  Theres no data integrity
> issues there?

That should work fine, and is a good way of doing backups. Not sure I'd
want to mount it though -- better to use dump or such like.

Ian
 
> 
> On Wed, 16 Feb 2005 22:37:33 -0000, Ian Pratt 
> <m+Ian.Pratt@cl.cam.ac.uk> wrote:
> > 
> > > Just curious, what version of LVM are you using where 
> snapshots are,
> > > uhm, reliable :-).
> > 
> > LVM snapshots work OK providing you a) use them as 
> read-only backups,
> > and b) make sure you allocate them enough disk space such 
> that there's
> > no danger of the snapshot filling.
> > 
> > I wouldn't recommend using them to do CoW guest file 
> systems, at least
> > in a production environemnt.
> > 
> > Ian
> >
> 
> 
> -------------------------------------------------------
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> Xen-devel mailing list
> Xen-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/xen-devel
> 


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RE: Question about OCFS1/2

[Ian Pratt]

 
> Is it possible to boot XEN from an OCFS1 file system? I have a running
> configuration using ext3 filesystems, but I've run into the backup
> problem everyine else has. If not OCFS1 what about OCFS2.

I guess it would be possible to use ocfs2 as a root file ssytem with an
appropriate initrd.

Alternatively, why not just use LVM and create snapshots for backup?

Ian

> 
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Re: Question about OCFS1/2

[Arthur Bergman]

On 16 Feb 2005, at 04:50, Ian Pratt wrote:

>
> Alternatively, why not just use LVM and create snapshots for backup?
>
> Ian
>

Just curious, what version of LVM are you using where snapshots are, 
uhm, reliable :-).

Cheers
Arthur

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Question about OCFS1/2

[Justin Dearing]

Hello,

Is it possible to boot XEN from an OCFS1 file system? I have a running
configuration using ext3 filesystems, but I've run into the backup
problem everyine else has. If not OCFS1 what about OCFS2.


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