[linux-lvm] LVM and DRDB

[linux-lvm] LVM and DRDB

[Wichert Akkerman]

Does anyone know if LVM will work correctly on top of DRDB? I
need to keep an off-site copy of a 5TB fileserver synchronized
and that might be an usefull approach.

Wichert.

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[linux-lvm] Re: LVM and DRDB

[Luca Berra]

On Fri, Apr 20, 2001 at 11:10:22AM +0200, Wichert Akkerman wrote:
> 
> Does anyone know if LVM will work correctly on top of DRDB? I
> need to keep an off-site copy of a 5TB fileserver synchronized
> and that might be an usefull approach.
> 
just curious, what is DRDB?
besides which kind of connection do you have beetween the two sites
are you planning on doing syncronous updates (i suspect such, since
you are planning to put lvm over it)

L.

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Re: [linux-lvm] Re: LVM and DRDB

[Wichert Akkerman]

Previously Luca Berra wrote:
> just curious, what is DRDB?

See linux-ha.org. DRDB is basically a RAID1 blockdevice via the
network.

> besides which kind of connection do you have beetween the two sites
> are you planning on doing syncronous updates (i suspect such, since
> you are planning to put lvm over it)

Connection can be as fast as it takes, I suspect in this case it
will be a ATM link used just for this.

Wichert.

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[linux-lvm] Re: LVM and DRDB

[Jens Axboe]

On Fri, Apr 20 2001, Wichert Akkerman wrote:
> 
> Does anyone know if LVM will work correctly on top of DRDB? I
> need to keep an off-site copy of a 5TB fileserver synchronized
> and that might be an usefull approach.

Should work, at least LVM does proper stacking in 2.4.4-pre kernels and
I gope DRDB does too.

-- 
Jens Axboe

Re: [linux-lvm] Re: LVM and DRDB

[Wichert Akkerman]

Previously Jens Axboe wrote:
> Should work, at least LVM does proper stacking in 2.4.4-pre kernels and
> I gope DRDB does too.

Is there any hope for 2.2 kernels?

Wichert.

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Re: [linux-lvm] Re: LVM and DRDB

[Chris Mason]

On Friday, April 20, 2001 12:32:53 PM +0200 Wichert Akkerman
<wichert@cistron.nl> wrote:

> Previously Jens Axboe wrote:
>> Should work, at least LVM does proper stacking in 2.4.4-pre kernels and
>> I gope DRDB does too.
> 
> Is there any hope for 2.2 kernels?

Andrea's 2.2 kernels have a stacking patch, you want his
95_GFS-09_generic_map.patch.  It makes it possible to stack raid and lvm,
and is obvious enough that drdb shouldn't be hard to add.

-chris

Re: [linux-lvm] LVM and DRDB

[Andreas Dilger]

Wichert writes:
> Does anyone know if LVM will work correctly on top of DRDB? I
> need to keep an off-site copy of a 5TB fileserver synchronized
> and that might be an usefull approach.

Probably not out of the box.  You will need to add the DRDB major
number to the list of devices that LVM will check for PVs/VGs.
Other than that (and the fact that the Linux kernel doesn't support
block devices > 2TB) you should be fine.  Hopefully you have some
sort of journaled filesystem for this?

Cheers, Andreas
-- 
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                 \  would they cancel out, leaving him still hungry?"
http://www-mddsp.enel.ucalgary.ca/People/adilger/               -- Dogbert

Re: [linux-lvm] LVM and DRDB

[Wichert Akkerman]

Previously Andreas Dilger wrote:
> Hopefully you have some sort of journaled filesystem for this?

Either ext3 or reiserfs, depending on the kernel we use. Doing a
fsck on 5TB of data is not something I would enjoy doing :)

Wichert.

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Re: [linux-lvm] LVM and DRDB

[Jes Sorensen]

>>>>> "Wichert" == Wichert Akkerman <wichert@cistron.nl> writes:

Wichert> Previously Andreas Dilger wrote:
>> Hopefully you have some sort of journaled filesystem for this?

Wichert> Either ext3 or reiserfs, depending on the kernel we
Wichert> use. Doing a fsck on 5TB of data is not something I would
Wichert> enjoy doing :)

For a file system that size you might want to look at XFS instead.

Jes

Re: [linux-lvm] LVM and DRDB

[Wichert Akkerman]

Previously Jes Sorensen wrote:
> For a file system that size you might want to look at XFS instead.

How stable is XFS compared to ext3 and reiserfs? For this system
minimum downtime is very important..

Guess I'll have to add XFS to the things-to-test-soon list.

Wichert.

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Re: [linux-lvm] LVM and DRDB

[AJ Lewis]

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On Fri, Apr 20, 2001 at 03:42:46PM +0200, Wichert Akkerman wrote:
> Previously Jes Sorensen wrote:
> > For a file system that size you might want to look at XFS instead.
> 
> How stable is XFS compared to ext3 and reiserfs? For this system
> minimum downtime is very important..
> 
> Guess I'll have to add XFS to the things-to-test-soon list.

Might as well add GFS while you're at it. :)

-- 
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Re: [linux-lvm] LVM and DRDB

[Wichert Akkerman]

Previously AJ Lewis wrote:
> Might as well add GFS while you're at it. :)

That was already on there. I might need to move my `change earth
rotation to create 34 hour days' plan to the top though so I can
get around to the rest. I bet that would be easier then the `build
time machine' approach.

Wichert.

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Re: [linux-lvm] LVM and DRDB

[AJ Lewis]

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On Fri, Apr 20, 2001 at 03:57:39PM +0200, Wichert Akkerman wrote:
> Previously AJ Lewis wrote:
> > Might as well add GFS while you're at it. :)
> 
> That was already on there. I might need to move my `change earth
> rotation to create 34 hour days' plan to the top though so I can
> get around to the rest. I bet that would be easier then the `build
> time machine' approach.

I dunno.  Time machines are that hard to build...and they mess the rest of
us up less than a 34 hour day would.  ;)

-- 
AJ Lewis
Sistina Software Inc.                  Voice:  612-379-3951
1313 5th St SE, Suite 111              Fax:    612-379-3952
Minneapolis, MN 55414                  E-Mail: lewis@sistina.com
http://www.sistina.com

Current GPG fingerprint = 3B5F 6011 5216 76A5 2F6B  52A0 941E 1261 0029 2648
Get my key at: http://www.sistina.com/~lewis/gpgkey
 (Unfortunately, the PKS-type keyservers do not work with multiple sub-keys)

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Re: [linux-lvm] LVM and DRDB

[Martin K. Petersen]

>>>>> "Wichert" == Wichert Akkerman <wichert@cistron.nl> writes:

Wichert> Previously Jes Sorensen wrote:
>> For a file system that size you might want to look at XFS instead.

Wichert> How stable is XFS compared to ext3 and reiserfs? For this
Wichert> system minimum downtime is very important..

I mkfs.xfs'ed the / and /home filesystems on my primary workstation on
September 7th last year.

'nuff said... :)

-- 
Martin K. Petersen, Principal Linux Consultant, Linuxcare, Inc.
mkp@linuxcare.com, http://www.linuxcare.com/
SGI XFS for Linux Developer, http://oss.sgi.com/projects/xfs/

Re: [linux-lvm] LVM and DRDB

[Jeffrey B Layton]

"Martin K. Petersen" wrote:

> >>>>> "Wichert" == Wichert Akkerman <wichert@cistron.nl> writes:
>
> Wichert> Previously Jes Sorensen wrote:
> >> For a file system that size you might want to look at XFS instead.
>
> Wichert> How stable is XFS compared to ext3 and reiserfs? For this
> Wichert> system minimum downtime is very important..
>
> I mkfs.xfs'ed the / and /home filesystems on my primary workstation on
> September 7th last year.

What happens with I/O loads? (I've heard that XFS dies a
nasty death - but that was early this year).

Thanks,

Jeff Layton


>
>
> 'nuff said... :)
>
> --
> Martin K. Petersen, Principal Linux Consultant, Linuxcare, Inc.
> mkp@linuxcare.com, http://www.linuxcare.com/
> SGI XFS for Linux Developer, http://oss.sgi.com/projects/xfs/
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@sistina.com
> http://lists.sistina.com/mailman/listinfo/linux-lvm

Re: [linux-lvm] LVM and DRDB

[Martin K. Petersen]

>>>>> "Jeffrey" == Jeffrey B Layton <jeffrey.b.layton@lmco.com> writes:

Wichert> How stable is XFS compared to ext3 and reiserfs? For this
Wichert> system minimum downtime is very important..
>>
>> I mkfs.xfs'ed the / and /home filesystems on my primary workstation
>> on September 7th last year.

Jeffrey> What happens with I/O loads? (I've heard that XFS dies a
Jeffrey> nasty death - but that was early this year).

We're fine to the extent that 2.4 is fine.  The latter has had a few
rough edges but is getting better.

FWIW, at lot of people are using XFS in production now.  So do check
it out:

        http://oss.sgi.com/projects/xfs/

-- 
Martin K. Petersen, Principal Linux Consultant, Linuxcare, Inc.
mkp@linuxcare.com, http://www.linuxcare.com/
SGI XFS for Linux Developer, http://oss.sgi.com/projects/xfs/

Re: [linux-lvm] LVM and DRDB

[Harri Haataja]

On Fri, 20 Apr 2001, Wichert Akkerman wrote:

> Previously Jes Sorensen wrote:
> > For a file system that size you might want to look at XFS instead.
> 
> How stable is XFS compared to ext3 and reiserfs? For this system
> minimum downtime is very important..

Well, it is SGI/IRIX technology so it should be hugely scalable and stable
itself. It is a bit new on the Linux port, though (like IBM JFS) but a lot
of people seem to be trusting it already.

I personally don't think Reiser/ext3 have a significant headstart
yet. Reiser does have the odd B(*? +?)-tree magic technology inside
=) they so lobby.

I remember seeing a feature comparsion somewhere. LJ perhaps?

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Re: [linux-lvm] LVM and DRDB

[Jeffrey Hundstad]

What will you be using as a filesystem for your 5TB server.  EXT2 isn't
much fun on our 1TB server ;-)

--
jeffrey hundstad

Wichert Akkerman wrote:

> Does anyone know if LVM will work correctly on top of DRDB? I
> need to keep an off-site copy of a 5TB fileserver synchronized
> and that might be an usefull approach.
>
> Wichert.
>
> --
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Re: [linux-lvm] LVM and DRDB

[Jeffrey Hundstad]

sorry... i guess this has been covered....

Jeffrey Hundstad wrote:

> What will you be using as a filesystem for your 5TB server.  EXT2 isn't
> much fun on our 1TB server ;-)
>
> --
> jeffrey hundstad
>
> Wichert Akkerman wrote:
>
> > Does anyone know if LVM will work correctly on top of DRDB? I
> > need to keep an off-site copy of a 5TB fileserver synchronized
> > and that might be an usefull approach.