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Virtual array 7400

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Olga_1
Regular Advisor

Virtual array 7400

Is it possible to configure VA7400 for RAID 5?
Thank you.
13 REPLIES
Sajid_1
Honored Contributor

Re: Virtual array 7400

Yes ..ofcourse!
learn unix ..
Sajid_1
Honored Contributor
harry d brown jr
Honored Contributor

Re: Virtual array 7400


It is raid 5 with dual parity.

http://www.hp.com/products1/storage/products/disk_arrays/midrange/va7400/infolibrary/index.html

live free or die
harry
Live Free or Die
A. Clay Stephenson
Acclaimed Contributor

Re: Virtual array 7400

The best answer is not precisely. The VA's use RAID5DP which is striped data with two parity blocks. You can run your VA in AutoRAID mode which dynamically balances RAID 1/0 for good performance with RAID5DP for better cost per unit of storage. AutoRAID keeps the most recently used data in RAID 1/0 and less frequently accesses data is migrated to RAID5DP.
If it ain't broke, I can fix that.
Olga_1
Regular Advisor

Re: Virtual array 7400

That the thing. They bought it to replace auto raid. The want it to configure for RAID 5

So the answer: it is not possible?
harry d brown jr
Honored Contributor
Solution

Re: Virtual array 7400

It is raid 5 with dual parity, meaning that there are two parity drives, this actually covers you if you lose two disks.

live free or die
harry
Live Free or Die
Sajid_1
Honored Contributor

Re: Virtual array 7400

Hello,

It's works on RAID-5. The *shifting* of data from RAID-5 to RAID-1/0 and the reverse has been done by the RAID controller. This is for making the array, more relaible and faster.

You could say that it works on RAID-5!
learn unix ..
Olga_1
Regular Advisor

Re: Virtual array 7400

I am sorry , I so not know much about it, but how its diferent from AUTORAID?
Sajid_1
Honored Contributor

Re: Virtual array 7400

I know what do you mean now. This may answer your question:
Is RAID-5 supported? - Yes.
Is AUTORAID supported? - Yes
Is RAID 1+0 supported? - Yes

Can you configure it *only* for RAID-5 (pure RAID-5, no AUTORAID) - NO.

Can you configure only for AUTORAID or RAID 1+0 - Yes.

hth,
learn unix ..
Sajid_1
Honored Contributor

Re: Virtual array 7400

Here you go: A same type of question asked in VA7400 FAQ:
http://www.hp.com/cgi-bin/cposupport/get_doc.pl?SNI=hpsurestor43759&LC=information_storage&Tfile=lpg35043
learn unix ..
Olga_1
Regular Advisor

Re: Virtual array 7400

Bingo! This is what I need it. Thank you very much.
Tim D Fulford
Honored Contributor

Re: Virtual array 7400

Just a iggly niggly thing, RAID 5 with dual parity is RAID 6!!! HP for some reason decided to call it RAID5-DP

I know this is splitting hairs but it makes a massive difference when it comes to mean times between falure. Effectively you get two things
1 - much larger RAID groups with acceptable MTBF (longer stripe)
2 - IF one disk fails you do not need to have a high priority rebuild as you still have one more failure to go

The only "down" side is that you need two extra disks instead of one.

just mu 0.02???

Tim
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Vincent Farrugia
Honored Contributor

Re: Virtual array 7400

Hello,

On the VA, there is no RAID-5. It's RAID-5DP, which means "dual-parity". What it actually does is that you can have TWO disks failing and still no data is lost. RAID-5 only supports ONE disk failing, if TWO fails, the entire LUN is lost.

That is it basically.

HTH,
Vince
Tape Drives RULE!!!