Debian guest losing partition table

[Enrico90]

Hello, I have a Debian 8 guest that looses the partition table.
It's just a standard stable installation with a webserver.
Today I shut it down to upgrade packages on proxmox (v4.2), on reboot the drive did not boot. I had to use gparted to recover the partition table and debian ISO to reinstall grub.
Why is it doing so?? How can I fix?
thanks

 

[tom]

this points to a faulty hardware somewhere.?

 

[Enrico90]

hi, I don't think so.
now the VM is running, and with a "fdisk -l" I can see the partition table.
hardware is good, the server provider just tested it before starting the service and the proxmox doesn't have problems, just the VM inside it..

 

[tom]

post the full list of your hardware details, including local storage setup.

 

[Enrico90]

here it is.
disk is 2x2tb sata in software raid with mdadm.

 

[tom]

mdraid is not a supported setup, due to many reasons.

one is the missing protection/recovery from faulty sectors. another is the non-protected harddrive cache from power loss.

if you want a stable system, go for reliable server hardware in a supported setup.

http://pve.proxmox.com/wiki/Software_RAID

 

[Enrico90]

ok, but I am getting problems with the VM inside proxmox. the proxmox itself is working fine, so it's not looking like a disk fault.

 

[tom]

you have a unreliable disk setup and you have issues with the disks. so for me, it looks like a setup/disk issue.