RAID 5 Expand/Extend for RAID 5

Hi

I have HP server (Smart array 7.85) RAID 5 configured with 3 x146 GB. Now need to increase the RAID logical drive by adding one more new drive. Please provide me if you have proper document. Vendor already confirmed we can increase but not finding proper steps to do this. Let me know if anyone has doc.
kbjijoAsked:
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pjamCommented:
You can add more 146GB to the same RAID if you have slots.
Or you can start a new RAID 5 with say 3 at 300GB and use it for data, keeping the original as OS & Programs

DL380 Gx?
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Hypercat (Deb)Commented:
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Hypercat (Deb)Commented:
It's been awhile since I did this, so I can't remember the exact commands in the ACU, but the procedure was something like:

1.  Install the new physical drive and attach it to the controller.
2.  Boot the server and open the ACU.
3.  Select the array and choose to extend it.
3.  Select the additional drive and add it to the array.
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kbjijoAuthor Commented:
Thanks for the reply. My query...

1 .  Expand or Extend ?

If opt for Expand, believe that it will create new  logical volume under same Array and required to create new logical drive.  In this case if it will  visible to OS as additional disk.
****Please correct me if i am wrong****

if any way that we can extend the same Logical group
Eg: currently 3x146 | but i want to add one more 146 disk to extend the drive without data lost.
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Hypercat (Deb)Commented:
I'm actually not sure whether you can do this or not - I think it depends on the controller and what options are on it.  I was just reading some documentation and came across this EE post:

http://www.experts-exchange.com/Storage/Misc/Q_25193028.html

This indicates that you need to have the battery-backed write cache feature on the controller.
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kbjijoAuthor Commented:
Checked with HP, as per them its possible on the server. But we didnt have any clarity , if its expand or Extend.

In case of expand , its required to create new logicalvolume.
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Hypercat (Deb)Commented:
I had to check on one of my servers that has the ACU installed.  I did use the wrong terminology - for the array itself, the word is "Expand" not "Extend."

All of the information you need is contained in the Help file that is part of the ACU itself.  So, if you open the ACU, then click the little Help icon in the upper right-hand corner of the window, and the help file will open.  Click Configuration/Arrays and then you'll see Expand Array. Click that and it gives you information about what you want to do. Note that you won't see the options you need available to you in the GUI for the ACU unless and until you actually add a new physical drive to the controller.

IIRC, in order to add a new physical drive to the existing array, and then have that space appear as part of the same logical drive you already have configured, you have to first do the Configuration/Arrays/Expand Array step, and then you have to follow that with the steps under Drives/Logical Drives/Extend Logical Drive.  This is where the confusion between the Expand command and the Extend command comes from.

Also, I may be looking at an old version of the ACU, so yours could be a bit different. Note also that if you have a HP Proliant SmartStart CD, you can run the ACU from there instead of running it from the Windows desktop if you so desire.
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andyalderSaggar maker's bottom knockerCommented:
hypercat has it 99% correct, only thing to add is if you have hot-plug bays then just plug the disks in, don't shut the server down or power it off for that first step.
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kbjijoAuthor Commented:
Thanks for the post. Let us try for a luck as you mentioned.

Please attach if you have any documents related.
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DavidPresidentCommented:
Only thing to add is that this new space will show up as empty.  Your filesystems will have to be expanded. The RAID controller doesn't care about such things.

Basically if you have one target lun that appears as  approx 300GB before, it will now appear as 450GB.  You'll still have to deal with the operating system.    Best practice is always full backup before you start.  Nothing is infallible.
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isnaaCommented:
I have 3 SAS HDD , I add one new SAS HDD
Expand option is not appearing rather it is creating new array

Please comment as soon as possible
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andyalderSaggar maker's bottom knockerCommented:
Verify you have the current logical disk highlighted in the ACU rather than the array. Also verify the battery's still good.
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isnaaCommented:
Yes all are good, and logical disk is highlighted ... screen shot attached.
ACU.JPG
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andyalderSaggar maker's bottom knockerCommented:
There's an unassigned drive, looks like it hasn't been added to the array yet. Can you do a similar screenshot with "show physical" so we can confirm what disks you have.
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