Messages in this thread | | | Date | Tue, 13 Mar 2001 18:41:53 -0500 | From | Douglas Gilbert <> | Subject | Re: Linux 2.4.2ac20 |
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> David Balazic wrote: > > > > Nathan Walp (faceprint@faceprint.com) wrote : > > > > > Also, sometime between ac7 and ac18 (spring break kept me from testing > > > stuff inbetween), i assume during the new aic7xxx driver merge, the > > > order of detection got changed, and now the ide-scsi virtual host is > > > host0, and my 29160N is host1. Is this on purpose? It messed up a > > > bunch of my stuff as far as /dev and such are concerned. > > > > SCSI adapters are enumerated randomly(*) , relying on certain numbering > > will get you into trouble, sooner or later. > > There is no commonly accepted solution, AFAIK. > > The same thing can happent to disk enumeration ( sdb becomes sdc ) > > or partition enumeration ( hda6 becomes hda5 ). > > > > * - theoreticaly no, but practicaly yes ( most of the time ) > > SCSI adapters are given host numbers in a random order? Even with no > hardware changes? Does this make less than sense to anyone else? Every > kernel EVER up till now has had the real scsi cards (in some particular > order) then ide-scsi. Have I just been lucky???
Built in scsi adapter drivers are probed in the order in which they appear in drivers/scsi/Makefile (in the lk 2.4 series). Adapters can be assigned to host numbers using the "scsihosts" kernel boot option (but this will not differentiate between 2 adapters controlled by the same driver (e.g. 2 29160 cards)). Scsi buses are scanned for devices in ascending order.
If you have lots of SCSI devices then devfs is your friend.
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