Randall A. Jones wrote: > I have a 4.8TB RAID device attached to a FC3 system via SCSI. > The system recognizes a RAID LUN volume of 2.1TB or less without any > problem. When I configure the RAID as a full 4.8TB LUN, the kernel > fails to recognize its actual size Peter Arremann wrote: > standard scsi in itsself has a limit of 2TB (32bit block adressing with > 512 byte blocks). LSI (others have followed since) has new enhancements > (http://www.infortrend.com/%5CNews%5C20041006%5Cf_64Bit_LBA.htm) but I > know of no storage devices that currently implement that since it is not > an official standard and seems to have some other problems.... It most certainly is an official standard. It's the READ(16) and WRITE(16) commands in SCSI-3, and Google turns up evidence that Linux 2.5.x added support for them in December 2002. Perhaps that support hasn't been retrofitted to all drivers, or perhaps Randall is encountering a limit somewhere else in the kernel. > Your RAID should not allow you that or at least warn you if it supports the > extension (what model is it?) but I know for sure that the adaptec 7xxx > chips don't. AIC7xxx chips don't care what the length of the command is. It's up to the driver. I have no idea whether the Linux aic7xxx driver supports them. Eric
