Phillip, Thank you very much for your help. >From the look of it port_no was added to ata_port in kernel 3.11. It looks like I am out of luck without upgrading or back porting it myself. I guess I'll have to weight my options. Thanks again, -Alan On Wed, May 21, 2014 at 9:16 AM, Phillip Susi <psusi@xxxxxxxxxx> wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > On 5/19/2014 4:46 PM, Alan Evans wrote: >> I have a host that is used to process the data on removable >> drives. It is essential to be able to indicate to an operator which >> drives are done and can be removed. >> >> When we were using a HighPoint card that uses sata_mv.ko we could >> count on the results of 'udevadm info -q path -n <dev>' >> representing a single physical port on the card. >> >> I have been testing a new card based on a Marvell 88SE9230 >> (ahci.ko) and I find that the scsi host number and corresponding >> target are changing depending on the order drives are attached to >> the system, not based on the port number. > > These numbers are assigned on a first come first serve basis, so if > another device initializes first, then it jumps in front. If you want > to know the port number, look in the port_no file of the ata_port. > >> Further for some reason in /sys/class/scsi_host I am seeing 8 >> hosts created per card where I would expect 4. > > Apparently the controller supports 8 ports. > >> Does anyone have any thoughts on why the behaviour differs between >> ahci.ko and sata_mv.ko? Is it the chip? The module? > > It looks like sata_mv does not support parallel scanning of all ports, > but ahci does. In other words, sata_mv scanned one port at a time, in > order, so they always registered in order, but ahci scans them all at > the same time, so the order they finish in varies. > > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v2.0.17 (MingW32) > Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ > > iQEcBAEBAgAGBQJTfMNaAAoJEI5FoCIzSKrwG0UH/Rrkh25BSA+3vqj6aQUDW0Ox > Fyeklgj+inohLzed5ZmGur2vfr8GA5Xrs1vO6Sk6hvDVadRhcyt45qkxAlVT09YS > vwXAQQQoIXzbiqetX7TJYJwo5TzCc3mIjUJjHrpfPrbUc43gs89yuqKpGubXurQp > N+QUPI4X1U6HRORsbFO9WfzZT3hvj99Nv0KmoDQUaSkhOS7lOqEPep1v42HflJLF > DlHmJmsuQmAy7fn4i2MpllnJx99EdpeFgPi2GdsPWi8gOBviuPMz0AWclUwY4K/q > SD0mHDrj+w/kE9wqJNUs2etkCNYMZwyfin1jxLyVaioiK8OFXkcoYyObGI79TzI= > =758u > -----END PGP SIGNATURE----- -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
