Messages in this thread | | | From | Jakub Jelinek <> | Subject | Re: devfs | Date | Sun, 11 Jan 1998 09:57:15 +0100 (MET) |
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> > Yes, let's have one.. > > > >>> bus 4 bits > > > > 16 controllers. OK... > > I'm thinking 4 cards with 4 busses on each card.
I think 4 bits are limiting too much. My disk array (which is the smallest of its kind) has 6 busses 5 disks each. But there are much larger arrays. > > >>> LUN 8 bits > > > > 256 LUN's per SCSI ID? Gosh! 2.0.33 has 7 or 8 or 32 (depending on the > > driver). > > Yes, available on some very expensive workstations.
Don't know how this is possible. LUN is always stored in the SCSI cmnd block, and there are exactly 3 bits for it. So I think if somebody has more than 3 bits, it means just that it is not actually different LUN, but different target. Or am I wrong?
> >>> partition 6 bits > > > > 64 partitions per disk? Yikes! Few commercial OS's have that many > > partitions per disk (Solaris allows 8), but OK... lets have 64 partitions.
Solaris allows 8, 'cause Sun disklabels are fixed sizes. If you use Sun disklabels in Linux, you have the same limitation.
Cheers, Jakub ___________________________________________________________________ Jakub Jelinek | jj@sunsite.mff.cuni.cz | http://sunsite.mff.cuni.cz Administrator of SunSITE Czech Republic, MFF, Charles University ___________________________________________________________________ Ultralinux - first 64bit OS to take full power of the UltraSparc Linux version 2.0.32 on a sparc machine (291.64 BogoMips). ___________________________________________________________________
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