Server Fault is a question and answer site for system and network administrators. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I have Dell PowerEdge 1950 with hardware raid Perc 5/i.

I want use software raid md/lvm.

Is any way to totally disable this raid and see "raw" sata disks?

I play alot with BIOS , enable SATA, disable raid controller, but nothing happents, i not see the disks.

Any advice?

share|improve this question
out of curiosity - can you please tell why do you prefer md/lvm instead of perc in this case? thx! – pQd Aug 2 '12 at 6:10
I hate this perc. Its slow, and low featured. For example i have 2 disk 500G and 1T and want create 500G raid1 and 500G without raid. With perc - i cant do that. Also Megacli utility - terrible. Also md and lvm works very well. – Korjavin Ivan Aug 2 '12 at 8:03
thanks a lot for your answer. – pQd Aug 2 '12 at 8:14
"Its slow" it is not any slower than software raid will be. – JamesRyan Oct 8 '14 at 13:02
up vote 3 down vote accepted

I had a similar problem with the LSI controller. I've every single disk exported as a JBOD device.

share|improve this answer
Jbod with one disk, look like raid0 on one disk. Thanks. Good idea. – Korjavin Ivan Aug 2 '12 at 12:32

Are you trying to use a filesystem solution like ZFS, which prefers RAW disks? If so, the better long-term approach is to use a dedicated SAS controller (HBA) instead of a RAID controller. I tend to prefer LSI's offerings.

Also see: ZFS SAS/SATA controller recommendations

share|improve this answer
Thanks alot. Yes, i want something like zfs, but on this hardware, without upgrades. Just wonder if it possible. – Korjavin Ivan Aug 2 '12 at 12:30
Nope. Not unless you create RAID 0 arrays comprised of one disk each and present the resulting volumes to ZFS. – ewwhite Aug 2 '12 at 12:40

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.