I have a freshly configured HP Proliant ML350 G6 (initially diskless) server running Windows Server 2008 R2 Enterprise.
Is it possible to use four 1.5Tb disks in an internal RAID10 array in Proliant ML350 G6 (That should give us around 3Tb of storage)? I am asking because I am only able to allocate partitions to first 2048Gb of my RAID10 array, last part of the disks is shown as "Unallocated" and there is no option to create any partitions there.
Technical specs indicate that I should be able to install a maximum 8x2Tb (here).
Two things, firstly for >2TB you need to use a GPT partition type (right click on the drive number) but secondly BIOS-based systems can't boot from GPT partitions, only EFI-based machines - your ML is BIOS based. Luckily you have a P410i inside that box, you should be able to use the use ACU/ORCA to carve up your R10 array into two logicial drives, a small one for boot and the rest for your data drive, this latter one can use GPT just fine.
The limit you're running into is a 32-bit limit. The fact that you're seeing 3TB even in the list is a strong indicator that you're running into the 2TB limit of 32-bit land. This tells me that the RAID controller itself is internally 32-bit.
Those specs specify 8x2TB, which is to say 8, 2TB volumes. You won't be able to create RAID10 sets from 1.5TB disks. 1TB disks is as high as it supports for that function.
Yep that'll work, be aware that SATA disks don't tend to last all that long in server environments.