RAID 5 Disk Management Question!

Okay!

HP Proliant ML350. I successfully added two more drives to my Server, initialized them through the HP Array Configuration Utility, and Expanded the size of my data drive. This took DAYS, but it's done.

My Question:

How safe is the "expand"ing process in the Disk Management interface? I was half expecting the ACU to add this space for me, but I guess not. Will it leave my current data intact? Will it be expanded immediately, or am I facing another "Days" situation? Color me nervous.

Thanks in Advance!
disks.jpg
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jimbonicsAsked:
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DavidPresidentCommented:
msft officially says to backup first.  do you have a ups with sufficient battery just in case?
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jimbonicsAuthor Commented:
Have a full backup from last night.

I assume you ask about the UPS in case of a power outage during the extending? I don't know about "sufficient" as I don't know how long this is supposed to take. It's hard to see in the image, but I'm effectively trying to double its size.
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aisaudaliteCommented:
I've done this several times over an iSCSI volume with no problems whatsoever regarding data integrity.
My experience is very positive.

Best regards.
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DavidPresidentCommented:
Here is the howto from MSFT
http://support.microsoft.com/kb/325590

How long will it take?  Based on how long it took to do the raid (which is a huge mystery, unless you have no battery and no write cache, and slow sata) then it could take hours and hours.  
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akirholCommented:
Dynamic disk extension in this manner should be near instant. You are not rebuilding or re-striping anything at this point, just simply changing the end point LBA for the dynamic volume. As always, make sure you have a backup before you go messing with the partitions, as already mentioned.
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akirholCommented:
Since I can't edit, basic disk expansion via diskpart is also near instant, again for the same reasons as noted in my last post.
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andyalderCommented:
The reason the HP side takes so long is that it has to shuffle the data across all the disks and maintain parity at the same time, as mentioned above Windows just has to extend the volume and file system. It used to run out of resources extending the file system sometimes but that's fixed nowadays.
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egryllsCommented:
This should be done within seconds.  As long as you have confidence in your backup, I have done this before on and ML380 with no issues.  As Windows already sees it, the process is very quick.
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jimbonicsAuthor Commented:
Thanks guys. It was done in an instant.
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