Before I started here a couple of months ago, my boss purchased a couple of Dell R630s and a PowerVault MD3820i (20 drive bays) to be our new infrastructure at HQ. We have dual 10Gb PowerConnect switches and two UPS devices, each connected to a different circuit. The plan is to rebuild the infrastructure on vSphere Standard (licenses already purchased) and have a similar setup in a datacenter somewhere (replicate the SANs, etc.). We're using AppAssure for backups (again, already purchased).
The PowerVault has 16 SAS drives that are 1.8 TB 7200 RPM SED drives and 4 SAS drives that are 400 GB SSD for caching. Well, we made disk groups and virtual disks using the SEDs (letting the SAN manage the keys), but it turns out we cannot use the SSDs they sent us for caching. In fact, they don't have SED SSDs for this model SAN.
At the time the sale was made, Dell ensured my boss everything would work as he requested (being able to use the SSDs for caching with the 7200 RPM SED drives). Now that we know this isn't going to be the case, we have some options.
First, they recommended we trade in the PowerVault for a Compellent and Equalogic. The boss did not want that because he was saying you are forced to do RAID 6 on those devices and cannot go with RAID 10 in your disk groups. As another option, Dell recommended we put the SSDs in our two hosts and use Infinio so we can do caching with the drives we have. In this case we would make Dell pay for the Infinio licenses and possibly more RAM since they made the mistake.
But I'm wondering if perhaps there is another option. Each server has 6 drive bays. So we have 20 drives total. Couldn't we have Dell take the SAN back, give us another R630, and pay for licenses of VMware vSAN for all 3 hosts? Each server has four 10 Gb NICs and two 1 Gb NICs. That might require we get additional NICs. But in this case, I'm not sure drive encryption is an option or if we can utilize the SEDs at all.
I've not double-checked the vSAN HCL or anything for the gear in our servers as this is just me spit balling. Is there some other option we have not considered? We're looking to get the 14 TB or so of usable space that RAID 10 will provide, but the self-encrypting drives were deemed a necessity by the boss. And without some type of caching, we will not hit our IOPs requirements.
Any advice is much appreciated.
Keep R630s, refund PowerVault, refund AppAss. Get VMware VSAN and Veeam (accordingly).