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HP P410 Raid Details


GDL
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Hi Gents.

A quick question for those more in the know than I am.

 

I've read that the HP P410 stores the raid information on all disks on all arrays.

 

So is this possible?

 

Have a 410 with two raid 5 volumes of 4 disks each. 

 

Remove raid 5 disk set 2 volume.

wipe the controller.

rebuild raid 5 disk set 1 and create a logical volume.

Disband disk set 1

 

Restore original raid setup using the raid information on disk set 2 as that should have the information about it's own and disk set 1?

 

Is that possible at all?

 

Thanks. 

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As far as I know, the RAID sets only contain their own information. In your example, the two RAID sets have no knowledge of each other. RAID sets made on a HP Smart Array controller are able to migrate between controllers. There is a lot of info on removing RAID sets and migration:

http://h20566.www2.hpe.com/hpsc/doc/public/display?docId=c03326739

http://h20566.www2.hpe.com/hpsc/doc/public/display?docId=c00729544

 

What HP server are you using?

What are you trying to achieve?

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It's a HP ML10 V2 with a HP P410/256 BBWC.

 

One array suffered an issue, I say it's an issue because I have no idea what went wrong (No ilo errors, no disk errors, no array error) the array just rebuilt.

 

I shut the server down, removed the 2nd array's disks and replaced them, powered it up. 

 

The first array was fine until I built the 2nd array and restarted. Then I think the BBWC suffered an error as the Ilo reported that advanced features are unavailable while it's charging. Both arrays rebuild as blank logical volumes.

 

Never seen it before, and no idea why it's happened. Not a massive loss of my lab but would like to understand what I did wrong. Getting it back would be a bonus. 

 

 

 

The reason I asked about restoring the array from the removed set of disks is because of this post.

https://community.hpe.com/t5/Disk-Arrays/HP-P410-Array-controller-Array-Lost/td-p/5398273

 

The RAID configuration is stored on the drives only, but on all drives, that is attached to the controller.

So no matter how many drives, and no matter how many arrays and logical drives. Information (configuration and status) is stored on all drives. It's called meta data, and is stored in the RIS area of the drives.

Edited by GDL
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I gave you the wrong link above. Here is the right one:

http://h20564.www2.hpe.com/hpsc/doc/public/display?docId=emr_na-c04441382

Look at moving drives and arrays on page 37, it details the procedure for removing a RAID set from a controller and bringing it back.

Have you updated the firmware on the P410 and run the diagnostics in the ACA or SSA? You may have a bad cache module or a bad battery.

You should be able to reconnect the original RAID sets following the process on page 37.

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I gave you the wrong link above. Here is the right one:

http://h20564.www2.hpe.com/hpsc/doc/public/display?docId=emr_na-c04441382

Look at moving drives and arrays on page 37, it details the procedure for removing a RAID set from a controller and bringing it back.

Have you updated the firmware on the P410 and run the diagnostics in the ACA or SSA? You may have a bad cache module or a bad battery.

You should be able to reconnect the original RAID sets following the process on page 37.

 

Many thanks Schoondoggy. I'll give this a shot tonight when I get in from work.

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