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тАО10-29-2009 08:55 AM
тАО10-29-2009 08:55 AM
Raid 5 on Proliant DL 380 G6
I have bought a new Server DL 380 G6, I have planned to Install Linux Sever on it.
I boot from the HP CD's and and it just gives me a option of creating arrays raid 0 & 1.
How do I go about it to create a raid5 solution?
Because when I create the array I'm not allowed to split the Disks in order to create a Raid 5 solution, please help
Messias
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тАО10-29-2009 09:50 AM
тАО10-29-2009 09:50 AM
Re: Raid 5 on Proliant DL 380 G6
Please check whether you have the additional cache module that fits in a dedicated slot and adds support for RAID5. If it is not present the card will only support RAID 0 and RAID.
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тАО10-30-2009 03:48 AM
тАО10-30-2009 03:48 AM
Re: Raid 5 on Proliant DL 380 G6
One Question, can by any chance, the Disks can be accessed by the OS without creating any array?
Like this:
Array A with 2 Disks for Raid1 and the other disks, the rest of them, as normal disk i can go for Linux software Raid.
Its that possible?
Thanks for you time sir.
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тАО11-02-2009 04:16 AM
тАО11-02-2009 04:16 AM
Re: Raid 5 on Proliant DL 380 G6
The good thing is, that you can create RAID 0 on 1 disk only.
Personally I would buy the battery, and get a HW RAID 5.
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тАО11-02-2009 04:43 AM
тАО11-02-2009 04:43 AM
Re: Raid 5 on Proliant DL 380 G6
Just a question, what do you mean with buy a battery? You mean a PCI card that supports RAD5, could you please advise me which one should i buy?
Thanks alot in advanced
Messias
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тАО11-09-2009 01:22 AM
тАО11-09-2009 01:22 AM
Re: Raid 5 on Proliant DL 380 G6
As Viveki wrote, You need additional cache/Battery to enable RAID 5 Support, on the the or some of the Smart Array Pxxx Controllers.
The Smart Array controllers do support RAID 5. But for some reason, you now need to have backup battery on the Cache for RAID 5 support to be enabled.
I can't tell you why HP has introduced this. On the Legacy Smart Array's, the battery was only required to enable write cache.
So what is this battery?
You got read cache and write cache.
On the legacy controllers, Compaq had a policy, saying, that they did not want to put customer data at risk. So for the write cache to be enabled, a battery had to be installed, to supply backup power for the write cache, so that the cache could hold the data, that wasn't written to the disks, in case of power loss. This battery was an option, that the customers who wanted it could buy it.
Over the years the battery has had many names, like Write cache enabler, BBWC (Battery Backed Write Cahce) and more.
In most cases, it's pretty much a rechargeable battery.
In a few cases it has been fixed to the cache module, so you would get a new cache module, when obtaining it.
On some, if not all of the Smart Array P models, the policy now, is that you have to install the battery to enable RAID 5.
My guess, is that HP want to increase the protection af your data.
What I'm telling you, is that the price for the battery is low, to get the feature, that you want.
A HW RAID is faster than a SW RAID, and don't put the workload on the servers CPU's.
I don't know aboute Linux, but with Windows you need to start the rebuild manually.
And if you got a failed disk 0, in a SW mirror, and a non hotswap disk, You need to know how to do it correctly.
And on HP-UX it's very complex.
With the smart array, you just replace the disk, and it will do everything for you.
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тАО11-09-2009 09:03 AM
тАО11-09-2009 09:03 AM
Re: Raid 5 on Proliant DL 380 G6
Make sure you install the ProLiant Support Pack and turn on the write accelerator. Assuming your RAID 5 is Logical Disk 2, do in Linux:
hpacucli ctrl slot=0 ld 2 modify arrayaccelerator=enable
hpacucli ctrl slot=0 modify dwc=enable forced # Drive Write Cache
hpacucli ctrl slot=0 modify cacheratio=50/50
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тАО11-09-2009 09:52 AM
тАО11-09-2009 09:52 AM
Re: Raid 5 on Proliant DL 380 G6
So hope i will be in a position to workaround and solve this issue.
Just a simple question, do you guys think that i should apply for a HP course to understand all of this hardware issues?
All the best and thanks a lot.
Try to plan your holidays to Maputo, will be great...
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тАО11-10-2009 06:15 AM
тАО11-10-2009 06:15 AM
Re: Raid 5 on Proliant DL 380 G6
lack of knowledge, all ways generate more work.
I'm not sure, if you need to do training.
It all depends on what you need to do in the future.
If you are going to work a lot on proliants in the future, training is nice.
otherwise - read the manuals, and ask the questions.
Cheers
/jag
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тАО11-13-2009 01:20 PM
тАО11-13-2009 01:20 PM
Re: Raid 5 on Proliant DL 380 G6
with 2 disks options are mirror and striping
assign points thanks enjoy :)