There is a problem when creating a software RAID 5 volume:
After creating a RAID 5 volume and rebooting the PC (the first time after creating the volume), the RAID 5 volume can be broken.

For create a 'stable' RAID 5 volume:
- Format your RAID5 volume twice (but using the Web GUI)
- Put a small file on this volume
- Reboot the PC
- Check that the volume is correctly mounted and working.
If not: re-format the volume,reboot and re-check.

I can reproduce this problem and send an email to the gvinum devel mailing list.

Regards,

Olivier

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Olivier Cochard
FreeNAS main developer
http://www.freenas.org
Skype: callto://ocochard