>Hello,
> One major number per controller, each controller >can have 16 devices, which leaves 16 numbers for partitions, of which 1 >describes the entire disk (ie /dev/sda), leaving 15. > This has to do with the old ISA architecture. On 8 bit systems (XT) the SCSI bus has 8 devices, one of which is reserved for the controller. On 16 bit systems (AT, 386, etc.) there can be 16 devices, again, one is reserved for the controller. This has nothing to do with the number of partitions, just devices. The max number of partitions is controlled by the device driver and is limited by the 16 bit device number. 8 are reserved for the device and the other 8 are to be split up according to the device type. With SCSI 4 bits are for the drive and 4 for the partition (with 0000 being reserved for the drive itself so that you can access things like the MBR). That leaves a total possible of 16 drives with 15 partitions each. I know that udev was supposed to overcome this limitation (as was the 32 bit device numbers that were suggested) but I don't know for sure if it does. I can't see how LVM can get around this by stringing partitions together if it can't address said partitions. In other words I think that you need to expand the number of possible devices before linking them together with LVM. >From what I have read, it seems that LVM can be used to get around this, >but I >don't know anything about it, sorry. There must be another way however, >perhaps some one else will tell. > >-d >-- -- Tres Melton [EMAIL PROTECTED] -- gentoo-user@gentoo.org mailing list
