* [linux-lvm] LVM across network
@ 2003-11-26 8:58 Marek Jan
2003-11-26 9:41 ` Spam
0 siblings, 1 reply; 6+ messages in thread
From: Marek Jan @ 2003-11-26 8:58 UTC (permalink / raw)
To: linux-lvm
Hello,
I have simple question. Is it possible run LVM across network ?
For example, first disk on pc1, second on pc3, third on pc3...
I need file system that colecting free space across network onto one
point.
Thank you, Marek Jan
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [linux-lvm] LVM across network
2003-11-26 8:58 [linux-lvm] LVM across network Marek Jan
@ 2003-11-26 9:41 ` Spam
2003-11-26 9:59 ` neuron
0 siblings, 1 reply; 6+ messages in thread
From: Spam @ 2003-11-26 9:41 UTC (permalink / raw)
To: Marek Jan
Yes. This is possible with NBD 2.0 and later (earlier nbd tools has
limitation of 4GB per shared disk/volume/device). You need to
compile the NBD (Network Block Device) module in the kernel too.
Then simply run on the server (the machines hosting spare volumes):
nbd-server 10000 /dev/hdax (replace 10009 with the port you want
to use)
On the client machine (where you want to run LVM to collect all
space;
nbd-client IP port /dev/nbd/0
For each server you connect simply change the IP/port and the NBD
device number. After this you run "vgscan" and "vgchange -ay vg"
You should be warned though. If you loose network connectivity you
can end up with filesystem damage.
> Hello,
> I have simple question. Is it possible run LVM across network ?
> For example, first disk on pc1, second on pc3, third on pc3...
> I need file system that colecting free space across network onto one
> point.
> Thank you, Marek Jan
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@sistina.com
> http://lists.sistina.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [linux-lvm] LVM across network
2003-11-26 9:41 ` Spam
@ 2003-11-26 9:59 ` neuron
2003-11-26 12:11 ` Spam
0 siblings, 1 reply; 6+ messages in thread
From: neuron @ 2003-11-26 9:59 UTC (permalink / raw)
To: linux-lvm
quick question about this, been looking for a good solution for this a long time. Any filesystems that can loose connectivity? I have a setup where I can't guarantee all the computers will stay stable, but it's only a setup for temporary storage anyway (1gb networks, temporary storage is for rendering files).
>
> Yes. This is possible with NBD 2.0 and later (earlier nbd tools has
> limitation of 4GB per shared disk/volume/device). You need to
> compile the NBD (Network Block Device) module in the kernel too.
>
> Then simply run on the server (the machines hosting spare volumes):
>
> nbd-server 10000 /dev/hdax (replace 10009 with the port you want
> to use)
>
> On the client machine (where you want to run LVM to collect all
> space;
>
> nbd-client IP port /dev/nbd/0
>
> For each server you connect simply change the IP/port and the NBD
> device number. After this you run "vgscan" and "vgchange -ay vg"
>
> You should be warned though. If you loose network connectivity you
> can end up with filesystem damage.
>
>
> > Hello,
> > I have simple question. Is it possible run LVM across network ?
> > For example, first disk on pc1, second on pc3, third on pc3...
> > I need file system that colecting free space across network onto one
> > point.
> > Thank you, Marek Jan
>
>
> > _______________________________________________
> > linux-lvm mailing list
> > linux-lvm@sistina.com
> > http://lists.sistina.com/mailman/listinfo/linux-lvm
> > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
>
>
>
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [linux-lvm] LVM across network
2003-11-26 9:59 ` neuron
@ 2003-11-26 12:11 ` Spam
2003-11-27 1:58 ` Rickard Olsson
0 siblings, 1 reply; 6+ messages in thread
From: Spam @ 2003-11-26 12:11 UTC (permalink / raw)
To: neuron
As far as I can tell NBD 2.x is stable. You can setup failovers with
NBD if you have more than one NIC in the computers. I have not
tested this myself.
The risk is that you accidentally disconnect a network cable etc.
Otherwise it is up to the stability of each machine to make this
work in the long run. For temp space this is fine =).
I doubt any network filesystem will allow you to disconnect a
machine and still be able to operate. NFS etc support a reastart of
the machine, but you cannot consolidate the distributed diskspace
into one logical volume.
Give NBD a try and test what happens if you disconnect a computer
then reconnect it.
I am using NBD 2.0 in Gentoo Linux together with LVM and ReiserFS
without any problems (so far).
> quick question about this, been looking for a good solution for
> this a long time. Any filesystems that can loose connectivity? I
> have a setup where I can't guarantee all the computers will stay
> stable, but it's only a setup for temporary storage anyway (1gb
> networks, temporary storage is for rendering files).
>>
>> Yes. This is possible with NBD 2.0 and later (earlier nbd tools has
>> limitation of 4GB per shared disk/volume/device). You need to
>> compile the NBD (Network Block Device) module in the kernel too.
>>
>> Then simply run on the server (the machines hosting spare volumes):
>>
>> nbd-server 10000 /dev/hdax (replace 10009 with the port you want
>> to use)
>>
>> On the client machine (where you want to run LVM to collect all
>> space;
>>
>> nbd-client IP port /dev/nbd/0
>>
>> For each server you connect simply change the IP/port and the NBD
>> device number. After this you run "vgscan" and "vgchange -ay vg"
>>
>> You should be warned though. If you loose network connectivity you
>> can end up with filesystem damage.
>>
>>
>> > Hello,
>> > I have simple question. Is it possible run LVM across network ?
>> > For example, first disk on pc1, second on pc3, third on pc3...
>> > I need file system that colecting free space across network onto one
>> > point.
>> > Thank you, Marek Jan
>>
>>
>> > _______________________________________________
>> > linux-lvm mailing list
>> > linux-lvm@sistina.com
>> > http://lists.sistina.com/mailman/listinfo/linux-lvm
>> > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
>>
>>
>>
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@sistina.com
> http://lists.sistina.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [linux-lvm] LVM across network
2003-11-26 12:11 ` Spam
@ 2003-11-27 1:58 ` Rickard Olsson
2003-11-27 9:53 ` Dan Sully
0 siblings, 1 reply; 6+ messages in thread
From: Rickard Olsson @ 2003-11-27 1:58 UTC (permalink / raw)
To: linux-lvm
Spam wrote:
> I doubt any network filesystem will allow you to disconnect a
> machine and still be able to operate.
I have been eyeing Coda for a while now and it looks like it does
exactly that. I'm not sure about the storage requirements, though. It
appears it may need two full mirrors worth for the replication, but they
can be spread out over a WAN if need be.
http://www.coda.cs.cmu.edu/index.html
iSCSI RAID, anyone?
http://www.simplesan.com/products/iscsiarrays.htm
/ Rickard Olsson,IT-Konsult/
/ Telefon: +46 70 635 01 42/
/ http://www.webhackande.se/
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [linux-lvm] LVM across network
2003-11-27 1:58 ` Rickard Olsson
@ 2003-11-27 9:53 ` Dan Sully
0 siblings, 0 replies; 6+ messages in thread
From: Dan Sully @ 2003-11-27 9:53 UTC (permalink / raw)
To: linux-lvm
* Rickard Olsson <richie@webhackande.se> shaped the electrons to say...
> > I doubt any network filesystem will allow you to disconnect a
> > machine and still be able to operate.
>
> I have been eyeing Coda for a while now and it looks like it does
> exactly that. I'm not sure about the storage requirements, though. It
> appears it may need two full mirrors worth for the replication, but they
> can be spread out over a WAN if need be.
>
> http://www.coda.cs.cmu.edu/index.html
CODA is really dead. If you want a disconnected filesystem, check out
Intermezzo, which is part of the Linux kernel as well.
> iSCSI RAID, anyone?
>
> http://www.simplesan.com/products/iscsiarrays.htm
I picked up a NetDisk from Fry's over the past week and attempted to get it
to work. Unfortunately, the only Linux drivers they have right now are beta,
and only for Redhat 8 & 9 at that. Their "admin" tools require Tk (not on a
server!), and appear to be some hacked up version of their own code and net-snmp.
The windows drivers worked a bit better, but would say "Drive has been
disconnected" every so often, when nothing had changed physically.
Nice (and relatively cheap) idea, but their implementation has a way to go.
-D
--
It's only after you've lost everything that you're free to do anything.
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2003-11-27 9:53 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2003-11-26 8:58 [linux-lvm] LVM across network Marek Jan
2003-11-26 9:41 ` Spam
2003-11-26 9:59 ` neuron
2003-11-26 12:11 ` Spam
2003-11-27 1:58 ` Rickard Olsson
2003-11-27 9:53 ` Dan Sully
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox