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Creating a LUN in Raid or pool level in  clariion cx500

Posted on 2012-04-10
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Last Modified: 2012-04-12
Hi,

I work with  latest IBM storage and there is no option to create a lun from Raid level, everything needs to be done in pool level. Can we create lun in Raid and pool level in cx500 ?
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Question by:mokkan
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by:Duncan Meyers
ID: 37831315
A CX500 supports RAID groups but not storage pools (it's a bit too old for storage pools). In Navisphere, you create a RAID Group where you select the disks and the RAID type (if you have very recent array OS, you may not see this - you set the RAID type when you bind the first LUN) . Once you've created the RAID group, you can right-click on the RAID Group and select Bind LUN... You select the RAID Group that will contain the LUN, then the size of the LUN. Once the LUN has bound (this can take some time), you can add the LUN to  a Storage Group that contains the host that you want to assign the disk to. Done. Have a cup of tea.
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by:mokkan
ID: 37832651
Thank you very much for your explanation. If I understand correctly, I create the Raid group using Disks, and then create a LUN from the raid group , and bring this LUN into storage group, and assign it to to hosts as we like.  Am I right ?

What exactly binding does here?
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by:Duncan Meyers
ID: 37832682
>I create the Raid group using Disks, and then create a LUN from the raid group , and bring this LUN into storage group, and assign it to to hosts as we like.  Am I right ?
That's correct.

>What exactly binding does here?
That's the name for creating a LUN. I don't really know why it's called binding - it just is and has been for years and years. Substitute 'create' for 'binding' and all is good...  :-)
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by:mokkan
ID: 37832710
Thank you very much. Can I create a LUN from 2 raid groups?
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by:Duncan Meyers
ID: 37832827
Yes - but what you do is create a metaLUN. Here's what you do: Create two LUNs of identical size on two different RAID groups. Select the first LUN, right click and select Expand.... A wizard opens. Make sure the Striped expansion radio button is ticked. Click Next. You'll now be shown LUNs that you can select for the expansion. Select the second LUN and click though accepting defaults until you click Finish. A new LUN is created out if the two component LUNs. All data is preserved and happens completely transparently to any hosts that are attached, so that it's easy to expand a LUN that's attached to a server.
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by:mokkan
ID: 37832929
Thanks a lot,  metalun means, create luns from different raid groups and make it  as a lun.
I believe raid level has to be same.  Am I right?
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Duncan Meyers earned 500 total points
ID: 37835005
No - RAID type has to be the same - that is; a protected RAID or unprotected. That is; you can't add a LUN from a RAID 0 group to a RAID 5 LUN, but you can add a RAID 1/0 LUN to a RAID 5 LUN.

It's usually wisest to keep the RAID types consistent across a striped metaLUN though.
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by:Duncan Meyers
ID: 37837549
Thanks! Glad I could help.
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