Thanks for your advices.
But the problem is not where to install ESXi (SD or not) but to have a datastore spread across more than 8 disks.
I agree that normally there is nothing wrong to simply have 2 datastores, but the problem with this customer is
that there is one VM which needs more than 8 disks to get as much IOPS as possible for that one VM.
RAID-5 is not an option at all as it scales bad on write performance esp. on vSphere so config
would be RAID-10.
What about having 2 extents for one datastore?
Will a single vmdk be spread across both extends and balanced "quite" evenly IO-wise?
I know there are much bad things being written about extents but IMHO much of that
seems to be based on rumors, missunderstandings, and simply fear of the unknown.
Cheers.