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Re: SAN Disaster Recovery

 
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Juan Panas
Occasional Contributor

SAN Disaster Recovery

We are making our recovery procedures in case of data loss.
We have a SAN with 3 Win 2000 Servers and a VA7100, all servers have local system disks and use space on the VA.

My questions are?
If the local information fails on a server, and we run a disaster recovery on the local disks, will it see the information on the VA automatically or will further configuration have to made?

Now the opposite, if the VA disks fail, can we just configure the VA again and restore the data or will we have to go through a special procedure to restore the data?

Thanks for your advise,

Juan Panas
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Erwin Zoer
Trusted Contributor
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Re: SAN Disaster Recovery

Hello Juan,


When you do a system state restore on a Windows 2000 machine, this means that (practically) all settings will be restored. So when you restart the system after it has been restored, it will see it's VA LUN's as it did before.

When you lose a LUN on the VA and need to recreate it, Windows 2000 will identify it as a new disk because it will not have the same signature as the old disk. In fact, the disk will probably have nothing on it at all, so Windows 2000 will prompt you to write a signature, upgrade it to a dynamic volume if desired. Next you will have to partition and format the new disk. The old disk will appear missing in the logical disk manager. The simplest solution would be to remove the missing disk and assign the new disk the drive letter of the old disk.

You could also consider writing the old signature back to the new disk with the Windows 2000 resource kit utility dumpcfg.exe. This will be important if the Windows 2000 machines are cluster nodes. Clusters identify physical disk resources using the signature. If another signature is written to a disk, the cluster will not be able to bring the disk on-line. In this case, you should use dumpcfg.exe to write the original signature back to the newly created disk instead of removing the missing disk and writing a new signature to the disk.

I hope this was useful.


Best regards,


Erwin