[CentOS] DatOptic RAID Array >2TB?
jlb17 at duke.edu
Fri Jun 8 01:22:24 UTC 2007
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
> 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.
Department of Biomedical Engineering
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