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Storage Capacity 16TB Thunderbay RAID 1?

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(@soulfinger)
Posts: 3
Member
Topic starter
 

MacPro 2013
Sierra 10.12.5
Thunderbay 4 16TB
SoftRAID Lite

After certifying, initializing, and creating a RAID 1 volume with SoftRAID Easy Setup, the available capacity of the volume was indicated to be 4 TB.

I was expecting a total capacity of 8 TB, being under the impression that RAID 1 mirroring reduces capacity by 50%. Is this incorrect?

I need up to 8 TB of storage, and with SoftRAID Lite was able to create two 2-disk RAID 1 volumes of 4 TB capacity each, but I don't imagine this is the most efficient/effective solution available here.

Did I miss something in my initial set-up that would have allowed a single volume with 8 TB capacity? Is this possibly a limitation of the Lite version of SoftRAID?

Any help would be much appreciated.
-SJJ

 
Posted : 10/10/2018 9:55 pm
(@softraid-support)
Posts: 8006
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RAID 1 is a Mirror, all partitions are identical. SoftRAID supports multiple disks per mirror.
I think you were hoping for RAID 1+0, which is striped mirrors, and would give you 8TB of capacity.
that feature is not available in Lite, it is in the full product.

 
Posted : 11/10/2018 12:18 am
(@soulfinger)
Posts: 3
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Topic starter
 

Ah, I see.

Would you be able to tell me what the differences in security and performance would be between a single 4-disk RAID 1+0 volume and my current configuration of a pair of 2-disk RAID 1 volumes?

I am happy to upgrade for the RAID 1+0 option in order to attain 8TB storage, but I'm interested in maximizing security over performance, and I wonder if a pair of 2-disk RAID 1 volumes would be more secure than one striped RAID 1+0 volume.

Thanks!
-SJJ

 
Posted : 11/10/2018 2:28 pm
(@softraid-support)
Posts: 8006
Member Admin
 

By Security I presume you mean reliability

A Mirror is the simplest RAID level and easiest to recover from when there is a problem.

A RAID 1+0 has much better performance, and can handle up to two disk failures, but is not as "recoverable" in the event of a disaster, as a simple RAID 1 volume would be.

So in your case, a pair or Mirror volumes may be better.

 
Posted : 11/10/2018 4:35 pm
(@soulfinger)
Posts: 3
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Topic starter
 

Got it, thank you!

 
Posted : 11/10/2018 8:52 pm
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