[linux-lvm] How to mirror or Replicate a primary server's data to a secondarymachine

[linux-lvm] How to mirror or Replicate a primary server's data to a secondarymachine

[Gary Mansell]

Hi,

I am considering whether to go down the path of a dual server, manual
failover solution for one of my RHEL fileservers.

I would have two identical servers in two different machine rooms on our
site and if the main server failed then I would manually reconfigure the
secondary server with the primary server's IP address so that the client
machines can carry on working.

Can anyone recommend to me what I need to do to mirror the data across
the two servers so that updates to the primary server are also made to
the secondary server

Thanks in advance for any help

Regards

Gary Mansell
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Re: [linux-lvm] How to mirror or Replicate a primary server's data to a secondarymachine

[Diaz Rodriguez, Eduardo]

Use rsync ????

Sorry, but is a dificult question because there is many, many responses.

regards!

On Thu, 14 Apr 2005 17:13:54 +0100, Gary Mansell wrote
> Hi,
> 
> I am considering whether to go down the path of a dual server, manual
> failover solution for one of my RHEL fileservers.
> 
> I would have two identical servers in two different machine rooms on 
> our site and if the main server failed then I would manually 
> reconfigure the secondary server with the primary server's IP 
> address so that the client machines can carry on working.
> 
> Can anyone recommend to me what I need to do to mirror the data 
> across the two servers so that updates to the primary server are 
> also made to the secondary server
> 
> Thanks in advance for any help
> 
> Regards
> 
> Gary Mansell
> --
> 
> This e-mail and any files transmitted with it are confidential and intended
> solely for the use of the individual or entity to whom they are addressed.
> If you have received this e-mail in error please notify the sender immediately
> and delete this e-mail from your system.  Please note that any views 
> or opinions presented in this e-mail are solely those of the author 
> and do not necessarily represent those of Ricardo (save for reports 
> and other documentation formally approved and signed for release to 
> the intended recipient).  Only Directors or Duly Authorised Officers 
> are authorised to enter into legally binding obligations on behalf 
> of Ricardo unless the obligation is contained within a Ricardo 
> Purchase Order.
> 
> Ricardo may monitor outgoing and incoming e-mails and other telecommunications
> on its e-mail and telecommunications systems.  By replying to this e-
> mail you give consent to such monitoring.  The recipient should 
> check this e-mail and any attachments for the presence of viruses. 
>  Ricardo accepts no liability for any damage caused by any virus 
> transmitted by this e-mail.  "Ricardo" means Ricardo plc and its 
> subsidiary companies.
> 
> Ricardo plc is a public limited company registered in England with registered
> number 00222915.
> The registered office of Ricardo plc is Bridge Works, Shoreham-by 
> Sea, West Sussex, BN43 5FG.
> 
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@redhat.com
> https://www.redhat.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/


=======================================================================================
El que nace para buey, hasta la yunta lame. 
=======================================================================================

[linux-lvm] RE: How to mirror or Replicate a primary server's data to asecondarymachine

[Bahadir Kiziltan]

I assume you mean a real-time replication solution. Also supports 
IP-failover so you don't worry about manual intervention.

- Constant Data (www.constantdata.com)
- PeerFS (www.radiantdata.com)

Both are the commercial products configured easily and can be downloaded for 
testing.


>From: "Gary Mansell" <Gary.Mansell@ricardo.com>
>Reply-To: Gary.Mansell@ricardo.com
>To: <nahant-list@redhat.com>, <linux-lvm@redhat.com>, 
><taroon-list@redhat.com>,        <linux-poweredge@dell.com>
>Subject: How to mirror or Replicate a primary server's data to 
>asecondarymachine
>Date: Thu, 14 Apr 2005 17:13:54 +0100
>
>Hi,
>
>I am considering whether to go down the path of a dual server, manual
>failover solution for one of my RHEL fileservers.
>
>I would have two identical servers in two different machine rooms on our
>site and if the main server failed then I would manually reconfigure the
>secondary server with the primary server's IP address so that the client
>machines can carry on working.
>
>Can anyone recommend to me what I need to do to mirror the data across
>the two servers so that updates to the primary server are also made to
>the secondary server
>
>Thanks in advance for any help
>
>Regards
>
>Gary Mansell
>--
>
>This e-mail and any files transmitted with it are confidential and intended
>solely for the use of the individual or entity to whom they are addressed.
>If you have received this e-mail in error please notify the sender 
>immediately
>and delete this e-mail from your system.  Please note that any views or 
>opinions
>presented in this e-mail are solely those of the author and do not 
>necessarily
>represent those of Ricardo (save for reports and other documentation 
>formally
>approved and signed for release to the intended recipient).  Only Directors
>or Duly Authorised Officers are authorised to enter into legally binding
>obligations on behalf of Ricardo unless the obligation is contained within
>a Ricardo Purchase Order.
>
>Ricardo may monitor outgoing and incoming e-mails and other 
>telecommunications
>on its e-mail and telecommunications systems.  By replying to this e-mail 
>you
>give consent to such monitoring.  The recipient should check this e-mail 
>and
>any attachments for the presence of viruses.  Ricardo accepts no liability 
>for
>any damage caused by any virus transmitted by this e-mail.  "Ricardo" means
>Ricardo plc and its subsidiary companies.
>
>Ricardo plc is a public limited company registered in England with 
>registered
>number 00222915.
>The registered office of Ricardo plc is Bridge Works, Shoreham-by Sea,
>West Sussex, BN43 5FG.
>
>
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Re: [linux-lvm] How to mirror or Replicate a primary server's data to a secondarymachine

[Dan Stromberg]

[-- Attachment #1: Type: text/plain, Size: 871 bytes --]


One way sync: rsync
Two way sync: unison

I'm partial to "balance" (you can find it on freshmeat) for load
balancing and failover of stateless protocols.

On Thu, 2005-04-14 at 17:13 +0100, Gary Mansell wrote:
> Hi,
> 
> I am considering whether to go down the path of a dual server, manual
> failover solution for one of my RHEL fileservers.
> 
> I would have two identical servers in two different machine rooms on our
> site and if the main server failed then I would manually reconfigure the
> secondary server with the primary server's IP address so that the client
> machines can carry on working.
> 
> Can anyone recommend to me what I need to do to mirror the data across
> the two servers so that updates to the primary server are also made to
> the secondary server
> 
> Thanks in advance for any help
> 
> Regards
> 
> Gary Mansell

[-- Attachment #2: This is a digitally signed message part --]
[-- Type: application/pgp-signature, Size: 189 bytes --]

[linux-lvm] Re: How to mirror or Replicate a primary server's data to a secondarymachine

[Saqib Ali]

If you want to implement a failover solution, you might want to
consider using shared storage,  e.g. :
1)  a HP clustered server with shared data storage; or
2) a XIOTECH SAN; or
3) or a NAS. You can build a NAS using Linux.

If you dont want to go the route of shared storage, you can probably
use RSYNC to perform replication of data.

-- 
In Peace,
Saqib Ali
http://tools.tldp.org/search.php <--- Search for Linux HOWTOs

Re: [linux-lvm] How to mirror or Replicate a primary server's data to a secondarymachine

[Greg Freemyer]

On 4/14/05, Gary Mansell <Gary.Mansell@ricardo.com> wrote:
> Hi,
> 
> I am considering whether to go down the path of a dual server, manual
> failover solution for one of my RHEL fileservers.
> 
> I would have two identical servers in two different machine rooms on our
> site and if the main server failed then I would manually reconfigure the
> secondary server with the primary server's IP address so that the client
> machines can carry on working.
> 
> Can anyone recommend to me what I need to do to mirror the data across
> the two servers so that updates to the primary server are also made to
> the secondary server
> 
> Thanks in advance for any help
> 
> Regards
> 
> Gary Mansell

If you need ordered writes (as a database would), the only solution
I'm sure works is DRBD.  I then MD layered above NBD can also be used,
but I'm not positive it supports ordered writes.

If you choose DRBD, then Linux-HA (heartbeat) can be added to the mix
to get rid of the manual failover aspect.  SLES (SuSE Linux Enterprise
Server) comes with both of these and Novell's support.

Or all of the above are GPL and you can use yourself and the community
for support.

HTH
Greg