Network Raid (possibly OT sorry)

Network Raid (possibly OT sorry)

[David Bernick]

hello fellow Reiser-lovers.

So Reiser rocks. It's great for a single system. But recently i've wanted to 
build a network raid: A disk on host-a be mirrored in real-time (or near 
real-time) to a disk on host-b. I know DRBD does this, but I'd like to read from 
both disks and write to a master. DRBD makes the slave disk non-readable. I've 
been playing with Intermezzo, which sort of does the trick but it seems to be 
fairly unsupported as far as active mailing lists are concerned.

So the question, as off-topic as it may be, is what do you use for a mirrored 
(replicated?) filesystem, if you use one? Any suggestions would be great.

Thanks!

d


-- 
David Bernick
bernz@bernztech.org

"They that can give up essential liberty to obtain a little temporary
safety deserve neither liberty nor safety."
		-- Benjamin Franklin, 1759

Re: Network Raid (possibly OT sorry)

[Isaac Claymore]

On Sun, Mar 14, 2004 at 05:14:34PM -0500, David Bernick wrote:
> hello fellow Reiser-lovers.
> 
> So Reiser rocks. It's great for a single system. But recently i've wanted 
> to build a network raid: A disk on host-a be mirrored in real-time (or near 
> real-time) to a disk on host-b. I know DRBD does this, but I'd like to read 
> from both disks and write to a master. DRBD makes the slave disk 
> non-readable. I've been playing with Intermezzo, which sort of does the 
> trick but it seems to be fairly unsupported as far as active mailing lists 
> are concerned.
> 
> So the question, as off-topic as it may be, is what do you use for a 
> mirrored (replicated?) filesystem, if you use one? Any suggestions would be 
> great.

Hi,

I'm not using such a setup, but I guess it may work by using a software
raid1 from a local disk and a remote disk exported by NBD (network block
device). But the performance of such a setup is surely poor.

I also stumbled across an asynchronous block level replication mechanism
weeks ago, it's here:

http://www.linuxjournal.com/article.php?sid=7265

And I vaguely remembered NFSv4 of 2.6 kernels seemed to have a built-in
support at filesystem level for data replication & migration.

HTH


> 
> Thanks!
> 
> d
> 
> 
> -- 
> David Bernick
> bernz@bernztech.org
> 
> "They that can give up essential liberty to obtain a little temporary
> safety deserve neither liberty nor safety."
> 		-- Benjamin Franklin, 1759

-- 

Regards, Isaac
()  ascii ribbon campaign - against html e-mail
/\                        - against microsoft attachments

Re: Network Raid (possibly OT sorry)

[Richard Heycock]

You might want to consider lustre http://www.lustre.org.

rgh


On Mon, 2004-03-15 at 09:14, David Bernick wrote:
> hello fellow Reiser-lovers.
> 
> So Reiser rocks. It's great for a single system. But recently i've wanted to 
> build a network raid: A disk on host-a be mirrored in real-time (or near 
> real-time) to a disk on host-b. I know DRBD does this, but I'd like to read from 
> both disks and write to a master. DRBD makes the slave disk non-readable. I've 
> been playing with Intermezzo, which sort of does the trick but it seems to be 
> fairly unsupported as far as active mailing lists are concerned.
> 
> So the question, as off-topic as it may be, is what do you use for a mirrored 
> (replicated?) filesystem, if you use one? Any suggestions would be great.
> 
> Thanks!
> 
> d
-- 
"It is possible to make things of great complexity out of things
 that are very simple. There is no conservation of simplicity"
 -- Stephen Wolfram

Richard Heycock <rgh@roughage.com.au>
tel : 0410 646 369
key fingerprint : 909D CBFA C669 AC2F A937 AFA4 661B 9D21 EAAB 4291

Re: Network Raid (possibly OT sorry)

[jenn sirp]

Hi,

I am an Intern at Livermore and did a little research on Lustre (Now I am
working on modifying Reiserfs). It is in use at LLNL and is a great FS. It
is a very efficient parallel file system that uses object based disks for
storage. The object schema makes it nice for fully utilizing disk capacity
but there is a hit in performance for the access trade-off.

As near as I can tell it is very reliable. It was released this October and
has promising benchmarks.

Jenn

----- Original Message ----- 
From: "Richard Heycock" <rgh@roughage.com.au>
To: <reiserfs-list@namesys.com>
Sent: Sunday, March 14, 2004 10:07 PM
Subject: Re: Network Raid (possibly OT sorry)


> You might want to consider lustre http://www.lustre.org.
>
> rgh
>
>
> On Mon, 2004-03-15 at 09:14, David Bernick wrote:
> > hello fellow Reiser-lovers.
> >
> > So Reiser rocks. It's great for a single system. But recently i've
wanted to
> > build a network raid: A disk on host-a be mirrored in real-time (or near
> > real-time) to a disk on host-b. I know DRBD does this, but I'd like to
read from
> > both disks and write to a master. DRBD makes the slave disk
non-readable. I've
> > been playing with Intermezzo, which sort of does the trick but it seems
to be
> > fairly unsupported as far as active mailing lists are concerned.
> >
> > So the question, as off-topic as it may be, is what do you use for a
mirrored
> > (replicated?) filesystem, if you use one? Any suggestions would be
great.
> >
> > Thanks!
> >
> > d
> -- 
> "It is possible to make things of great complexity out of things
>  that are very simple. There is no conservation of simplicity"
>  -- Stephen Wolfram
>
> Richard Heycock <rgh@roughage.com.au>
> tel : 0410 646 369
> key fingerprint : 909D CBFA C669 AC2F A937 AFA4 661B 9D21 EAAB 4291
>