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Adding extra drives to mirror

 
Johnny Omega
Occasional Visitor

Adding extra drives to mirror

Hi Everyone

We have a ML370 with a HP Array with only two drives which are mirrored. Ive purchased four new drives, can I add additional drives to increase the capacity of the array without losing any data?

regards

Johnny
11 REPLIES
juan quesada
Respected Contributor

Re: Adding extra drives to mirror

will depend on controller model/firmware version/battery back writte cache size.

what do you have?
Johnny Omega
Occasional Visitor

Re: Adding extra drives to mirror

Its a HP Smart Array 641 F/W 2.68 not sure about the battery cache. I've enclosed the array diagonstic report.
Ephie
Occasional Visitor

Re: Adding extra drives to mirror

The smart array 641 controller is an old array controller device and I doubt if it support BBWC device. Therefore, without BBWC, expansion of an existing logical drive capacity is impossible. The best way to go about it with the current configuration is to ghost the hard drive and copy the content of the logical drive to DVD and then wipe the current array configuration and recreate it with new hard drive. Then you can copy back the backed up data to the newly create logical drive.

Hope this help

regards

Max
Trygve Henriksen
Respected Contributor

Re: Adding extra drives to mirror

Actually... wrong.

The stock 641 has 64MB RAM, but there's an upgrade to 128MB with Battery Backup, and it also supports capacity expansion.

http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=us&taskId=120&prodSeriesId=3745263&prodTypeId=329290&objectID=c00349427

Whether or not the OS you run on the server supports expansion, though, is another matter.
Trygve Henriksen
Respected Contributor

Re: Adding extra drives to mirror

The report indicates it's a stock 641 with 64MB cache and no BatteryBacked RAM.

It may need that option for online expansion.
(I wouldn't run an expansion without the battery even if it would be possible. If the power fails or glitches during expansion.... not good...)
gregersenj
Honored Contributor

Re: Adding extra drives to mirror

I believe, that i dosn't need BBWC to do a RAID level migration / expansion.

I have tried to search for it, and find nothing.

I believe, that this BBWC dependency, has been intriduced with the SAS controllers. P and E models.

I might be wrong.

BR
/jag
gregersenj
Honored Contributor

Re: Adding extra drives to mirror

ACU user guide:

http://docs.hp.com/en/9320/acu.pdf

BR
/jag
Trygve Henriksen
Respected Contributor

Re: Adding extra drives to mirror

This controller DO support expansion.
(We used this exact model in servers earlier)

Which functions does the 'HP Array Configuration Utility' offer?

Which OS do you use?
gregersenj
Honored Contributor

Re: Adding extra drives to mirror

"Which functions does the 'HP Array Configuration Utility' offer?"

You don't know? Trygve.

BR
/jag
Johnny Omega
Occasional Visitor

Re: Adding extra drives to mirror

The array does give me the option to 'expand array'. We are currently using server 2003.
gregersenj
Honored Contributor

Re: Adding extra drives to mirror

You must install the drives first.
Then the option appear.

BR
/jag