server 2012 raid5 RAW

Jose Bredariol
Jose Bredariol used Ask the Experts™
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My windows server 2012 now shows my RAID volume (3 disk 1Tb each) as RAW.  Also shows Redundancy fault in risk.
How can I solve that ? I
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Most Valuable Expert 2015

Commented:
Replace the bad disk of your array and then allow it to rebuild. If after that your array is still raw, check if there is another disk that went bad, and replace that. If not, build a new array (I wouldn't recommend RAID 5. RAID 1, 6 are much more reliable), then just restore the data from your backups.

Author

Commented:
All three disks are in RAW format, two of them are online, the other one is on error.
I could't replace this one, because the remove disk option is not enable.
noxchoIT Product Manager
Top Expert 2009

Commented:
What kind of RAID controller is? Is this a hardware RAID or software one?
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Author

Commented:
Windows 2012 server - RAID is software
noxchoIT Product Manager
Top Expert 2009

Commented:
Means you are working with dynamic drives which you combined into RAID via Windows Disk Management, right?or is this an onboard RAID controller?
Can you list the brand and model of the hardware components in the server so we can help you better?

Author

Commented:
Yes, you are right, it´s from Windows Disk Manager. 3 samsung disk 1Tb each, motherboard intel DH61WW.
Philip ElderTechnical Architect - HA/Compute/Storage
Commented:
What type of software RAID array was set up? RAID 0 (stripe) or RAID 5 (parity)?

If a stripe was set up then there was no redundancy. If RAID 5 then replace the drive while the desktop computer is off, boot, and check Disk Management to see if the new disk can be incorporated back into the array.

Author

Commented:
i replaced the disk, but i'm not able to mount the volume yet.
I'm sending the picture attached.
IMG-5900.JPG
Looks like the old RAID-5 second disk failed problem.

RAID-5 can sustain failure of one drive, but if not replaced and rebuilt, a second drive failure means your data is lost.

Two points about RAID-5
1) Not recommended implemented via software due to the high CPU overhead involved.
2) Now not recommended at all with v large disks (>500GB) due to the risk of a second disk failing during the extended rebuild time of the first disk.

Consider RAID10 or maybe RAID-6

Author

Commented:
Can I implement RAID6 or 10 via software
noxchoIT Product Manager
Top Expert 2009

Commented:
Nope.
You wouldn't want to do RAID-6 in software for double the reason you don't want to do RAID-5 in software!

You can certainly do RAID-1 in software, and certain other experts on EE, recommend that as it does have some advantages over the more simple hardware RAID controllers - whatever you do, do not use a FakeRAID setup

Author

Commented:
Thanks all

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