Hi all,
We have two individual ESXi hosts with about 20TB internal storage running on version 5.5. We want to upgrade these servers to version 6.5. The servers are in the HCL compatability list and support version 6.5. After the upgrade we want to deploy vSAN/HA/DRS on these two servers as a ROBO cluster.
I have read on many websites that vSAN only supports physical RAID0 sets and pass-through disks. Our hosts are set up with RAID1 disks (12*3.5TB so effectively 6*3.5TB). Before I came across the best practice designs, it was my understanding that I could just add the RAID1 drives to vSAN and then apply a RAID1 VM Storage policy on my virtual machines. Why is RAID1 not supported for vSAN?
My biggest concern with RAID0 is that whenever a drive fails, the entire RAID0 set fails. We will then have to replace the failed disk, recreate the RAID0 set and re-add it to the vSAN cluster. I'd rather have RAID1 disks which I can hot swappable replace whenever a disk fails.
If there is no other option then we are kind of forced to wipe the disks and reconfigure them as RAID0 (RAID controller doesn't support pass-through) but my question is to "Why?".
Also with pass-through disks, doesn't this give me the same issue as with RAID0? Whenever a disk fails in pass-through mode, what happens to my vSAN node? Can I simply replace that disk?
Thank you all in advance.