Failed to partition the selected disk [SOLVED]

[dargaud]

Hello, hello,
I normally use Ubuntu or CentOS, but I need to install the latest Debian on a server. I've done that once before (8.5) and besides a nonfree driver issue, I didn't run into issues. But here: impossible.

I've put the nonfree 9.4 ISO on a USB key, I boot and start the install process. When comes time for the partitioning, I select the entire disk (a hardware RAID1 of 2 SSDs, 250Gb) and I get:

Failed to Partition the selected disk - This Probably happened because the selected disk or free space is too small to be automatically partitioned

I tried also in manual, same thing (with a similar but different message sometimes): impossible.

I tried that same ISO in a VM and I have no problem installing the system on a virtual disk.

I also booted my server with a debian liveCD and had no problem doing a quick and dirty partition of my SSDs manually using fdisk, fsck, mounting it and using it.

EDIT: a few extra info: the SSDs in the RAID1 are 240Gb Dell Perc H730 Adp. If I try to install on a RAID5 3Tb (normally meant for data), the installer proceeds normally.

So what is going on, why is the installer refusing my disk ?
Thanks

[acewiza]

Have you re-accomplished RAID setup on the SSD's by clearing the partition tables and creating new raid partitions?

[dargaud]

Yes I have.
As a test I installed the latest (today's) Ubuntu and the whole install was done in 5 minutes, so I'm gonna use that instead. So I guess the problem is solved... in a way !

[acewiza]

Then plz mark the thread solved.