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Adding RAID 5 into the Server

By azamup ·
Hi All!

I have windows NT 4.0 SP6a with 2 HSPL (Hot Swappable) 18.2 GB HDDs. Now the company purchased another HSPL 18.2 GB (in other words now I have 3 same capacity and model hard drives) & SCSI Controller Card as well.

I want to clarify that should I install the Controller Card & the third 18.2 GB HDD into the exiting installed server and afterwards configure the RAID 5 or all the Server OS & softwares has 2 be reinstalled again for adding the above mentioned card and HDD, kindly advice if any further precautionary measures,

Shall be greatful 4 help,

Azam Noor

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Adding RAID 5 into the Server

by TimTheToolMan In reply to Adding RAID 5 into the Se ...

Hi,

I'm assuming that the SCSI controller card also provides hardware based raid?

Furthermore, I assume that since you only had two disks previously, that you weren't using raid? - although you may have had raid 0 or raid 1?

Either way... Firstly take a clean backup.

If you had a mirror set previously, then break it.

Then... Install the Controller card and apply the drivers. Dont worry about the third disk or raid yet...

Then take another backup if you feel its warrented. I would if you HAD a mirror set and broke it above.

Then rearrange the disks onto the new card and configure the raid 5. There will almost certainly be floppy based software supplied to do this.

Next... restore the OS onto the new disk configuration. This may be more complex if you're currently using software based mirroring and you didn't do the second backup above as I'm not sure what effect that would have on the restored system.

That should be it!

Cheers,
Tim.

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Adding RAID 5 into the Server

by TimTheToolMan In reply to Adding RAID 5 into the Se ...

Hi,

After rereading my answer - I'd definitely do a backup after installing the drivers - thats the backup you'd be restoring with...

Cheers,
Tim.

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Adding RAID 5 into the Server

by azamup In reply to Adding RAID 5 into the Se ...

The question was auto-closed by TechRepublic

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Adding RAID 5 into the Server

by shmaltz In reply to Adding RAID 5 into the Se ...

Answer 1 had some good advice.
I just want to add the following:
If you had Software based RAID 1, do a backup (you will not use this backup unless you have to do a rollback) brake the mirror, do another backup.
Add the harddrive.
If your controller supports hardware RAID 5, reconfigure you controller to do RAID 5. Restore from the second backup (with the broken mirror).
If you controller does not support RAID 5; you can not use Software RAID 5 on the BOOT partition.
You will have to do amirroring on the boot partition and RAID 5 on the other partitions. Reconfigure mirroring.
If you used Hardware RAID 1 until now. Backup your computer. Brake the mirroring. Backup again (just for precaution, you will not use this backup unless the first one doesn't work). Add the new harddrive. Reconfigure for hardware RAID 5. Restore your OS from the first backup. Now it should start ok.
What you have to remember:
Hardware RAID configurations are unknown to the OS, Thats why they cost so much more.
Software RAID is a pain.
When you recongigure hardware RAID it has to reinitialize the harddrive which ereases all the data. Thats why you need a backup.
When you brake a mirror from software RAID 1, according to documentation (a say according, remember the law; when something can go wrong it will go wrong) it is suppose to work OK. That's why you will only have to reconfigure the the RAID and in most cases no resotre is needed.

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Adding RAID 5 into the Server

by azamup In reply to Adding RAID 5 into the Se ...

The question was auto-closed by TechRepublic

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Adding RAID 5 into the Server

by azamup In reply to Adding RAID 5 into the Se ...

This question was auto closed due to inactivity

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