On Thu, 7 Jun 2007 at 8:19pm, Benjamin Karhan wrote
in fact, the kernel "USB Mass Storage" driver that detects the array when i plug it in only detects the device as 2TB as well. (so, it could easily be a limitation of that hardware driver, although i couldn't find any specification for that limitation when i googled for it).
My googling seemed to indicate that, yes, the USB mass storage protocol (not just the Linux driver, but the protocol itself) is limited to 2TB per LUN.
i should say, although i dread the possible suggestions that may arise from admitting it, that the array also supports FireWire and SATA connections. (we are STRONGLY inclined to wanting to use the array as USB, as our primary concern is easy portability and not speed)
I can't see anything that says Firewire has the same 2TB limitation as USB. So that's worth a shot.
the RAID array is the DatOptic eRAID, with 5 750GB disks in a RAID-5 array. the array itself seemed to have no problem creating the ~3TB volume, but it does not detect as that size when i hook it up.
Many such devices have an "auto-carve" feature (or some such), that automatically splits one RAID volume into <2TB chunks, each on a different LUN. If you're married to USB, see if your hardware will do that.