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Upgrading HDDs for additional capacity?

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bcourtney82
Occasional Visitor

Upgrading HDDs for additional capacity?

I understand that if I need more cache, I can upgrade the size of the SSDs I'm using in my shelf. But if I want to increase the amount of available capacity for the array, I need to purchase an expansion shelf, even though there are multiple drive sizes supported by the different controller models. Is there a technical reason why one can't upgrade the HDD's in the same way you would the SSD cache, or is this a business-imposed limitation?

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ndyer39
Honored Contributor
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Re: Upgrading HDDs for additional capacity?

Hi Bill,

it's simply to do with RAID. if you were to attempt to swap out a drive (say 2TB) for a bigger drive (say 4TB), the RAID rebuild can only build for the rest of the capacity drives in the RAID set... meaning that your new 4TB drive would only be able to address 2TB of space of the disk, as the rest of the drives within the RAID set are 2TB drives. This would also cause a lot of complexity, potential performance issues (rebuilding 12 disks one at a time could take a long, long time) and support problems... so it's safer, cheaper and easier to add an expansion shelf.