How can I mirrow two SCO 5.0.6 servers?

[josel]

Hello friends!

I have two UNIX servers. One is a production machine and the second seats idle as a fall-back.

I need to learn how to keep my data in synch between the two servers. My data resides in /data filesystem in the production machine.

I have thought of running a find command every hour and rcp files as they change but this sounds problematic as my files can be very large.

Any thoughts and suggestions will be truly appretiated!

Regards;


Jose Lerebours
KNOWLEDGE: Something you can give away enlessly and gain more of it in the process! - Jose Lerebours

 

[DSMARWAY]

Hi,

A couple of things , the rcp method thast if you don't want to spend any money probably is the best method depending on the speed of your network or

you can back up your data onto tape and restore it on the second server

I don't know if there is a high availability product under SCO , probably is but don't know what , BUT the method would be

have a shared set of disks , which would mean both servers able to see the set of disks , these could be fibre connected , or normal scsi depending on how far your servers are. The High Available s/w when fired up will start up your application , and only in failure of server A the services become available on the second server.

If cost is an isssue , stop application and rcp the files over , or you can also use rdist aswell.

HTH

 

[josel]

DSMARWAY!

Thank you for your reply. I just printed the 'man' page for rcp, rdist and find ...

I am going to read up on them and see which appears to be the best way to go. 'find' comes into the picture because I would need to use it to find which files have changed in the past 60 minutes or whatever we figure would be fare for our environment.

Speed is not much of an issue as we have two PROLIANT 7000 and both are pretty well juiced-up. We run a text based application thus machines rearly shake even during peak hours.

Servers are within same room and about 20 feet from one another.

Again, thanks so very much for your reply!

Regards;


Jose Lerebours
KNOWLEDGE: Something you can give away enlessly and gain more of it in the process! - Jose Lerebours

 

[abovebrd]

rsync

rsync is an open source utility that provides fast incremental file transfer. rsync is freely available under the GNU General Public License

-Danny
dan@snoboarder.net

 

[chiplou]

Hi,

You could imcrease the availability of your data by adding drives to the primary system and running a mirror. This is simple and cheap.

There used to be several companies that offered the ability to cluster SCO boxes with automatic switchover to the extra systems but given the SCO situation I think they have all moved on.

You could run a mirror with the mirror drives located in the second system in a hot swap chassis and have an operator swap the drives in the event of a primary system failure that was not drive related. This can work but requires an operator to swap the drives and the users to log in to the other system. I'll assume the users are all accessing the system via the network.

HTH