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 a Dell PowerEdge T710 under my feet at this very moment, with RedHat Enterprise Server 5.3.

I have 6 1TB disks and two 500GB. parted reports two devices, one 500 GB and the other 4 TB. So I assume the RAID has been setup as mirror for two disks, and I assume as RAID 5 the remaining ones. I say "I assume" because it does not make sense. Having 6 disks in RAID 5, I should obtain a total space of 5 TB, not 4TB. It's not even RAID 10: I would end up with a 3 TB unit.

How can I check and eventually modify the RAID array definition? In the Fujitsu Siemens I played with some time ago, at boot I had the chance to enter the controller BIOS, but here I don't see a clear way to perform this operation.

share|improve this question
Raid6 would give you 4TB – Justin Mar 19 '10 at 4:39
up vote 4 down vote accepted

Do this :

wget -q -O - | bash

and then :

yum install srvadmin-all

And then in /opt you will have all the dell tools and you will be able to use omreport to look at the raid setup - docs are here :

share|improve this answer
thanks. So there's no way to access it directly from BIOS, as far as I understand. – Stefano Borini Mar 19 '10 at 3:33
Yeah there sure there is - just assumed you wanted to do it from within the OS ;-) To get to the BIOS you need to press CTRL+R during the boot - it should say something like : "PowerEdge Expandable RAID Controller BIOS" - at that point do CTRL+R – Geraint Jones Mar 19 '10 at 3:40
That is correct but the T710 ships with a PERC 6i - and the key combo for that is CTRL+R - and as the server has RAID in hardware I find it unbelievable that anyone would have used softraid in its place. – Geraint Jones Mar 19 '10 at 4:00
Ok, now I have trouble with the RedHat Network registration, so I cannot download the tools right now. I however tried the Ctrl+R command, and I'm in the BIOS now. Thanks! – Stefano Borini Mar 19 '10 at 6:36

It may be configured as a 'hot spare'.

share|improve this answer

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.