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Windows 7: Raid 5 help

28 Feb 2011   #1
darkstarsinner

 
Raid 5 help

I searched and found a few topics close but nothing right on. I set up RAID on my mobo and proceeded in installing Windows7. Now when I first set up my RAID5 using four 500GB HDD's it showed I had 1500GB. Understandable because 5 takes away one drive in case of drive failure. Now after the driver install I come to the menu where I need to format my drives. It shows my RAID5 array as only having 1370GB. Why is that? Did I do something wrong? The OS is installed on an 50GB SSD (that for some reason is only showing 46.5GB) seperate from the RAID5 array. I'm missing almost 700GB of memory here. What's going on?


My System SpecsSystem Spec
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28 Feb 2011   #2
Golden
Microsoft MVP

Windows 7 Ult. x64
 
 

Hi,

With the SSD, the lesser space is normal, but I can't quite explain why - perhaps someone else can.

With the RAID5, your 1370GB is also normal since some of the space is used to "build the array".

Have a look at this link:

RaidCalc - Raid Disk Space Utilization Calculator - Raid, RAID, Redundancy, Performance - iBeast Business Solutions

Everything that you have done is perfectly fine - you haven't done anything wrong

Regards,
Golden
My System SpecsSystem Spec
28 Feb 2011   #3
darkstarsinner

 

That is absolutely phenominal. Thank you so much for your reply. I was dreading wrestling with installing everything all over again. I went through so much crap to get everything up and running right and had to learn so much I'm rediculously relieved to know it's semi over.
My System SpecsSystem Spec
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28 Feb 2011   #4
Golden
Microsoft MVP

Windows 7 Ult. x64
 
 

No worries mate. Its all good.
My System SpecsSystem Spec
03 Mar 2011   #5
darkstarsinner

 

Lol looks like I'll be starting all over again anyway. System seemed to be running fine but as I dug deeper more stuff was wrong. certain windows programs couldn't be found. So in an effort to fix things I am wiping all drives and starting over. This time I'm going to attempt to install a bootable Ubuntu 10.10 on an e-SATA connected HDD while running 7 on the 50GB SSD. But I still need some help. I want to run WIN7 and only WIN7 on the SSD and the rest on the RAID drive. However I don't think I've quite grasped the proper way to set it up. I followed a tutorial on here but things still ran funky. Any suggestions?
My System SpecsSystem Spec
03 Mar 2011   #6
DeaconFrost

Windows 7 Ultimate x64 SP1
 
 

On a workhorse system, you'd be better of just installing Windows 7 and then virtualizing Linux. Your system is more than capable. I can run two VMs at once without missing a beat in performance. RAID5 is kind of overkill for a non-server, but to each his own. The array size is completely normal though. I'm just surprised you missed the very simple problem, but got the much more difficult one correct. You knew that RAID5 loses one drive's capacity (hard concept), but missed the simple basic one, that a 500 GB drive is not a 500 GB drive once formatted.
My System SpecsSystem Spec
03 Mar 2011   #7
darkstarsinner

 

Lol I knew you'd lose some of the memory but 200GB of unaccounted for memory was driving me nuts.

As far as virtualizing Linux I put a little thought into it. But I want the full experience of running it. I want to learn how to install and run the different apps on it. Not sure of how much you can actually do while running it in virtual mode. Lol my poor system has been running four about a week now and I keep shutting her down and reconfiguring everything.

And I'm actually thinking about running the HDD's 2x 500GB RAID0.
My System SpecsSystem Spec
03 Mar 2011   #8
DeaconFrost

Windows 7 Ultimate x64 SP1
 
 

There's really no difference running Ubuntu in a VM, to be honest. The only difference is, you don't have to mess with bootloaders or run the risk of causing an issue with your Windows install. It will run extremely well, at pretty much native speeds. Dual booting is pretty a dead tech...left to fade away into the sunset. It isn't running in virtual mode, like XP Mode....it is a full fledged computer.

Speaking of dead tech, RAID0 with spinners is right at the top of that list. You get pretty much no performance gain, except for very unique situations, yet you double your risk of data loss, and can also increase your seek times which can impact basic Windows operations. It's been about 3-4 years since RAID0 really had a following and was considered a valid option on a desktop. Keep in ind I'm speaking strictly about HDDs, and not SSDs.
My System SpecsSystem Spec
03 Mar 2011   #9
darkstarsinner

 

Hmmm. That sucks. I've never used RAID before now. I bought the 500GB drives just for it. Oh well. I'll still play around with the drives to see what I can get out of them.
My System SpecsSystem Spec
04 Mar 2011   #10
Golden
Microsoft MVP

Windows 7 Ult. x64
 
 

Quote   Quote: Originally Posted by DeaconFrost View Post
You get pretty much no performance gain, except for very unique situations, yet you double your risk of data loss, and can also increase your seek times which can impact basic Windows operations. It's been about 3-4 years since RAID0 really had a following and was considered a valid option on a desktop. Keep in ind I'm speaking strictly about HDDs, and not SSDs.
This is more or less correct, and depends entirely on the usage of the RAID, as DeaconFrost points out.

On my home system, I run my OS and most of my program files off my SSD. Soemtimes, I do some work from home, and for this I have 2 x 500GB in a RAID0 that is specifically used for a specialist program that performs an exceptionally high number of writes to a very specific "database". Before going down this route, I was able to test several configurations that irrevocably demonstrated that I could do more, and finish the job quicker, with a RAID0 configuration.

By and large, RAID0 has become redundant (excuse the pun), in the classic home environment. In the type of work I do (geostastical estimation) RAID0 is still the ONLY way to work with or build and manipulate very large spatial datasets (> 90GB), in as short a time as possible.

Regards,
Golden
My System SpecsSystem Spec
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