RAID5 degraded - system hangs

[Michel, Dietmar]

Hi Guys,

 

I´m using an older Server with FreeBSD 6.2 als Fileserver in my home office.

Now I made an upgrade using 4 SATA II disks connected to a promise TX4310 Raid controller.

Defining a RAID5 a bios level, starting the server and building up the Raid at OS level:

# atacontrol create RAID5 32 ad4 ad6 ad8 ad10

# bsdlable ...

# newfs ...

 

And now I have a functional Raid named ar0.

 

At boot time the bios told me that even at this level the raid in initializing - world seemed to be ok.

 

Now I tried to prove Raid function and disconnect one disk.

Theoretical data is covered by the rest of 3 ... but after I get the system message that one disk has been disconnected the maschine stopps working.

Told me: ar0 raid 5 degarded after a fw minutes no input is possibble. 

 

 

Even after reboot 

....

ar0: disk0 Ready
ar0: disk1 Ready
ar0: disk2 Ready
ar0: disk3 down no device found

... end of work

 

No single user mode or other starting option seemed to work.

I have no chance to rebuild the raid via atacontrol.

 

Any hints?

Raid without reliability doesn´t make sense!



Regards

 

  Dietmar