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Rebuild of Array/HDD!

Posted on 2006-10-30
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Last Modified: 2012-05-05
Dear Experts,

I have an issue with one of our domain controllers. Last week one (1 of 2) of the Hard Disks have failed and therefore purchased a new HDD to replace the old one. I have made sure the discs are identical in terms of speed, pins/channels and that they are same size etc. They are a different manufacturer (Maxtor Atlas 10k IV and Fujitsu MAW3073NC) and have been advised that as long as the same size and speed and not smaller then it should not be a problem.

I have removed the failed disc and installed the new one and as it stands there is no Windows OS RAID/ SCSI Disc management software so am having to reboot the server and press ALT + M to enter the RAID Management Suite.

The Console has detected both discs as in the current setup ID0 - is the Fujistu and ID1 - is the Maxtor (Current) HDD. I have tried to select Rebuild and it does not seem to like it and at the moment the Fujitsu is highlighted by a RED font. I know it seems a little vague as I tried installing this yesterday and as the server needs to be up and running I can't access the software as the server needs a reboot.

If anyone could let me know the steps I need to do for the installation of a new HDD for RAID I would be most grateful. I don't know whether I need to format the disc first before the RAID software can begin a rebuild and also was not sure if the process was not automatic either.

Normally I have used Dell Servers with the Windows based RAID software and have found it very straight forward.

Any help in this matter will be greatly appreciated.

Regards,
Ross.
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Question by:rosshuts
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Expert Comment

by:btassure
ID: 17834145
Have you added the new disk to the array?

If the controller has not seen that disk before it will probably not automatically assign to that array even though the SCSI ID/LUN is the same. Try looking for an add/modify RAID menu somewhere. Once it is in you should be able to rebuild it.
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by:andyalder
ID: 17861014
Sounds like a size problem, Different makes are rarely exactly the same size, even disks from the same manufacturer are sometimes slightly different in capacity. Some RAID controllers assume a rebuild may be required with a slightly smaller than original disk and so waste a little bit of the disks when originally creating the array, some don't. Can you see the exact sizes in your ROM based config program?
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Author Comment

by:rosshuts
ID: 17879878
Hi,

After everyone had left on Friday night I attempted to have another go.

Firstly I moved the new disk from the old failed slot and into an unused slot (ID-2) incase of any RAID issues and this time I managed to get some information on the the actual size. Although they say they are the same size on the tin/box (73.5GB) in the RAID management console the current working disc (Maxtor) is 70148MB where as the new disc (Fujitsu) is 70135MB.

I can assume from this that due to smaller size the setup of the new disc and array will not work?

I had tried to rebuild/configure and add or modify the disc/array and I get either of the following error messages!

1) If I select Rebuild I get - Size of this physical drive is less than the size of the configured drive. It cannot be selected for Rebuild.
2) If I try to configure new array I get - Invalid Operation for this Device.

Any other info on this will be greatly appreciated.

Cheers,
Ross.
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