Take the 2-minute tour ×
Server Fault is a question and answer site for professional system and network administrators. It's 100% free, no registration required.

I want to purchase 2 x 2TB drives, and install FreeNas on my Dell Powervault 745N.

People on the internets seem to be having trouble with the MD3000 firmware, and I want to make sure I can solve any issues before buying the drives.

Before I invest, I have 3 questions :

  1. Is there a partition size limit determined by the RAID controller? That is, could I have a striped 4TB partition?

  2. The spec sheets make me wonder if the RAID controller needs all 4 drives in order to work. Is there any reason this will have to run in RAID5?

  3. If I buy 4 matching drives, would the controller support a RAID6 configuration?

I'm basically new to all this RAID stuff - sorry for any noob questions.

share|improve this question

1 Answer 1

up vote 1 down vote accepted

1 - The 745N uses a CERC controller if I remember correctly, and its maximum array size is 2TB per array.

What this means is that if you have total disk space (after parity overheads) > 2TB then you'll have to create multiple arrays to maximise your capacity.

2 - Generally no, devices will work with any disks that match your chosen RAID level. RAID 5 requires a minimum of 3 disks, RAID6 4 disks, RAID1 2 disks.

3 - I don't believe the 745N supports RAID6

share|improve this answer

Your Answer

 
discard

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.