DSM-G600, DNS-3xx and NSA-220 Hack Forum

I am trying to build up this amount of storage using internal + USB disks, connected to DNS:

1 - 500GB + 500GB of internal disks (JBOD)
2 - 320GB USB disk #1 (IOMEGA) - this disk includes a USB 2.0 HUB with 3 ports (formated EXT2), and is connected directly to USB port of DNS-323
3 - 1TB USB disk #2 (don't remeber exactly the brand), connected to the 1st port of the USB HUB (formated EXT2)
4 - 1,5TB USB disk #3 (IOMEGA), connected to the 2nd port of the USB HUB (formated EXT 4)

Historically I have been using the storage indicated above in #1 and #3 connected directly to the USB port of DNS-323, with no issues. I had funplug 0.3 and firmware 1.03. I runned out of space so I started the upgrade in storage I thought would work ok.

I upgraded the firmware to 1.08b09 (UK dlink site) and the funplug to 0.5 and started all connections. Unpluged USB disk #2, plugged in USB disk #1, partitioned (updating first FDISK) and formated to EXT2. I also were able to mount the disk and it is working OK.

I then plugged in USB disk #2, mounted and everything is OK. Performance in all disks are OK.

The problem is with USB disk #3. I can partition (Linux/83 type), but formating takes forever. I tried EXT2 first, now trying EXT4. But performance is very bad, there are IO errors, not sure if related to hardware or not. I had this disk formated to NTFS in a windows environment with no problems at all, so I think there are no HW issues.

My question is if there are any restrictions on the DNS side to have so much storage mapped (this adds up to almost 4TB). Would that be my problem?

Thanks in advance.

RS