On Thursday 09 August 2007, Rick Stevens wrote: >On Thu, 2007-08-09 at 18:58 -0500, Mikkel L. Ellertson wrote: >> Robert P. J. Day wrote: >> > On Thu, 9 Aug 2007, Rick Stevens wrote: >> >> Uhm, not exactly. You get up to four primary partitions, one of which >> >> can be an extended partition. Inside that extended partition you can >> >> have as many "logical" partitions as you wish. >> > >> > i'm not convinced of that infinite limit: >> > >> > http://www.justlinux.com/forum/showthread.php?threadid=150073 >> > >> > anyone want to clarify that? >> >> From what I understand, there are a max of 16 device entries created >> for a SCSI hard drive. (sdx and sdx1 through sdx15) So while you can >> have more partitions then that, Linux will not let you access them >> when using the SCSI code to access the drive. I believe it is a >> driver problem more then a udev problem. > >Well, the "x" in your example can take the RE form "[a-z]+". For >example, we have some storage arrays with, oh, 130 LUNs on them. They >appear as /dev/sda[1-15] through /dev/sdiv[1-15] > >As far as the partition numbers, that's based on the minor number of the >block device. The formula is "(16 * drive number) + partition number". >The "16" is what limits it to 16 partitions (with partition 0 being the >same as the whole drive, e.g. "/dev/sda0" is the same as "/dev/sda"). > >"man sd" will show you the magic. not on my uptodate FC6 install Rick. That manpage has a quite Jurassic 1992 date, and there is no way one can infer what you just wrote from that documents contents. ---------Bottom of file---------- FILES /dev/sd[a-h]: the whole device /dev/sd[a-h][0-8]: individual block partitions 1992-12-17 SD(4) --------- If this document isn't correct, it should be made so. I don't see any way out of sda16 not being equal to sdb0, and sda17 then = sdb1, eg the next device's first partition, (if its not an outright error) using the logic described in this file. -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) A clever prophet makes sure of the event first.
