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How to make Drives visible to OS if they are connected to raid but raid is not configured?

Posted on 2016-09-02
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Last Modified: 2016-09-27
So I have 4 drives that are "Unconfigured Good". They are not in any virtual drive. I want to present them without change them to JBOD. How to make my drives visible to OS keeping them as separate drives (not putting them into any kind of RAID)?
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Question by:SITPL
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by:noxcho
ID: 41781148
What RAID controller?
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rindi earned 250 total points (awarded by participants)
ID: 41781220
Connect them to a controller that doesn't do RAID. Or check your controller's manual. Many allow you to setup your disks as a single disk RAID 0 array, and then they would be visible to the OS as single disks.
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by:arnold
arnold earned 125 total points (awarded by participants)
ID: 41782099
raid controller presents configured volumes to the OS.
See if your controller Dan pass through the disks.

You need a non-raid controller where you need disks access to Be direct from the OS
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by:Gerald Connolly
Gerald Connolly earned 125 total points (awarded by participants)
ID: 41784147
So just configure them in the RAID controller as single volume and they will get presented to the host as individual devices.

Why do you want to do this anyway?
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by:SITPL
ID: 41787204
Conditions are that the Disks are attached to RAID card but raid is not configured and JBOD or pass through is not supported then how to get handle of hard disks.
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by:arnold
arnold earned 125 total points (awarded by participants)
ID: 41787224
try to create a RAID 0 logical volume consisting of a single Disk for each physical disk.  
using a RAID controller where a standard HD controller is a less costly alternative.... What System Vendor/model do you have, you may have the option of using MB included/built-in ports instead of the RAID controller.
I think it was mentioned earlier as well...

Which RAID controller Do you have.  Some Older controllers had the options of switching the Controller from a RAID to a non-raid controller. Perc 4's........ during bootup/bios settings...
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by:Gerald Connolly
Gerald Connolly earned 125 total points (awarded by participants)
ID: 41787274
So what's the issue about not configuring these disks in the RAID controller?

unless you are able to switch the controller into non-RAID mode, whatever is on these disks will be trashed
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by:SITPL
ID: 41789035
I am using  'LSI MegaRAID SAS 9361-4i'  RAID controller. My purpose is to wipe all the disks properly, not a single byte should not remain unwipe.
I have done that after converting JBOD mode using MegaCli but it fails when JBOD is not supported by the RAID card.
Second, it can be done after converting each disk to RAID 0 individually but after that some bytes are conserved for the RAID 0. So some bytes are left, which is not according to my work.
I can get the information of the disks individually but i want handle or the path like '/dev/sda' of each disk individually but unable to get them.
I have dismental the RAID but unable to get handle of the disks.
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by:arnold
arnold earned 125 total points (awarded by participants)
ID: 41789104
What Are you after? Creating a RAID 0 volume with all drives and then running the "wipe" should provide the same as if you were running it one drive at a time.

The mechanics does not require you to run the application one drive at a time, the process merely needs to repeat on the media ........

Do you have SAS HBA through which you can connect the drives?
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by:rindi
rindi earned 250 total points (awarded by participants)
ID: 41789175
Then as I mentioned, connect the disks to a non-raid controller.
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Expert Comment

by:Gerald Connolly
ID: 41817520
Several excellent suggestions for resolving this problem by the team
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