FC6 - kernel 2.6.18-1.2798.fc6 - udev-095-14 I'm trying to develop some rules to give me device-name persistence on my SCSI disks. I have a couple of test rules: BUS=="scsi", PROGRAM="/sbin/scsi_id -g -u" RESULT=="20004cffffe0e0976", NAME="dsk0_%n", OWNER="root", GROUP="root", MODE="0700" RESULT=="SSEAGATE_ST336807LC_3KT0CTTM00007530YTR2", NAME="dsk1_%n", OWNER="root", GROUP="root", MODE="0700" With these rules disabled, I get: [root@dev1 ~]# ls -l /dev/dsk* /dev/sd* /dev/sg* brwx------ 1 root disk 8, 0 Nov 28 11:48 /dev/sda brwx------ 1 root disk 8, 1 Nov 28 11:48 /dev/sda1 brwx------ 1 root disk 8, 16 Nov 28 11:48 /dev/sdb brwx------ 1 root disk 8, 17 Nov 28 11:48 /dev/sdb1 brwx------ 1 root disk 8, 18 Nov 28 11:48 /dev/sdb2 brwx------ 1 root disk 8, 19 Nov 28 11:48 /dev/sdb3 brwx------ 1 root disk 8, 20 Nov 28 11:48 /dev/sdb4 brwx------ 1 root disk 8, 21 Nov 28 11:48 /dev/sdb5 brwx------ 1 root disk 8, 22 Nov 28 11:48 /dev/sdb6 brwx------ 1 root disk 8, 23 Nov 28 11:48 /dev/sdb7 brwx------ 1 root disk 8, 24 Nov 28 11:48 /dev/sdb8 crw------- 1 root root 21, 0 Nov 28 11:48 /dev/sg0 crw------- 1 root root 21, 1 Nov 28 11:48 /dev/sg1 (Note the two sg generic entries). If I now enable these rules and reboot, I get: [root@dev1 ~]# ls -l /dev/dsk* /dev/sd* /dev/sg* brwx------ 1 root disk 8, 0 Nov 28 12:05 /dev/dsk0_ crw------- 1 root root 21, 0 Nov 28 12:05 /dev/dsk0_0 brwx------ 1 root disk 8, 1 Nov 28 12:05 /dev/dsk0_1 brwx------ 1 root disk 8, 16 Nov 28 12:05 /dev/dsk1_ brwx------ 1 root disk 8, 17 Nov 28 12:05 /dev/dsk1_1 brwx------ 1 root disk 8, 18 Nov 28 12:05 /dev/dsk1_2 brwx------ 1 root disk 8, 19 Nov 28 12:05 /dev/dsk1_3 brwx------ 1 root disk 8, 20 Nov 28 12:05 /dev/dsk1_4 brwx------ 1 root disk 8, 21 Nov 28 12:05 /dev/dsk1_5 brwx------ 1 root disk 8, 22 Nov 28 12:05 /dev/dsk1_6 brwx------ 1 root disk 8, 23 Nov 28 12:05 /dev/dsk1_7 brwx------ 1 root disk 8, 24 Nov 28 12:05 /dev/dsk1_8 brwx------ 1 root root 8, 0 Nov 28 12:04 /dev/sda brwx------ 1 root root 8, 1 Nov 28 12:04 /dev/sda1 brwx------ 1 root root 8, 16 Nov 28 12:04 /dev/sdb brwx------ 1 root root 8, 17 Nov 28 12:04 /dev/sdb1 brwx------ 1 root root 8, 18 Nov 28 12:04 /dev/sdb2 brwx------ 1 root root 8, 19 Nov 28 12:04 /dev/sdb3 brwx------ 1 root root 8, 20 Nov 28 12:04 /dev/sdb4 brwx------ 1 root root 8, 21 Nov 28 12:04 /dev/sdb5 brwx------ 1 root root 8, 22 Nov 28 12:04 /dev/sdb6 brwx------ 1 root root 8, 23 Nov 28 12:04 /dev/sdb7 brwx------ 1 root root 8, 24 Nov 28 12:04 /dev/sdb8 Why have I got both sd devices and dsk devices? And what is the second line? Why have I got an entry: crw------- 1 root root 21, 0 Nov 28 11:45 /dev/dsk0_0 This looks like a generic device, but if so, why only one? And where are the normal sg devices? If I change the order of the disks on the SCSI bus, the 'generic' entry changes to dsk1_0. It seems to be associated with the first disk encountered in the bus scan. My disks are in a SCSI shelf and dsk1 is now in a lower-numbered slot than dsk0. [root@dev1 ~]# ls -l /dev/dsk* /dev/sd* /dev/sg* brwx------ 1 root root 8, 16 Nov 28 16:05 /dev/dsk0_ brwx------ 1 root root 8, 17 Nov 28 16:05 /dev/dsk0_1 brwx------ 1 root root 8, 0 Nov 28 16:05 /dev/dsk1_ crwx------ 1 root root 21, 0 Nov 28 16:05 /dev/dsk1_0 brwx------ 1 root root 8, 1 Nov 28 16:05 /dev/dsk1_1 brwx------ 1 root root 8, 2 Nov 28 16:05 /dev/dsk1_2 brwx------ 1 root root 8, 3 Nov 28 16:05 /dev/dsk1_3 brwx------ 1 root root 8, 4 Nov 28 16:05 /dev/dsk1_4 brwx------ 1 root root 8, 5 Nov 28 16:05 /dev/dsk1_5 brwx------ 1 root root 8, 6 Nov 28 16:05 /dev/dsk1_6 brwx------ 1 root root 8, 7 Nov 28 16:05 /dev/dsk1_7 brwx------ 1 root root 8, 8 Nov 28 16:05 /dev/dsk1_8 brwx------ 1 root root 8, 0 Nov 28 16:05 /dev/sda brwx------ 1 root root 8, 1 Nov 28 16:05 /dev/sda1 brwx------ 1 root root 8, 2 Nov 28 16:05 /dev/sda2 brwx------ 1 root root 8, 3 Nov 28 16:05 /dev/sda3 brwx------ 1 root root 8, 4 Nov 28 16:05 /dev/sda4 brwx------ 1 root root 8, 5 Nov 28 16:05 /dev/sda5 brwx------ 1 root root 8, 6 Nov 28 16:05 /dev/sda6 brwx------ 1 root root 8, 7 Nov 28 16:05 /dev/sda7 brwx------ 1 root root 8, 8 Nov 28 16:05 /dev/sda8 brwx------ 1 root root 8, 16 Nov 28 16:05 /dev/sdb brwx------ 1 root root 8, 17 Nov 28 16:05 /dev/sdb1 Is this all as expected? Am I going to be screwed later on if I need to do something that requires a generic SCSI device for a particular disk? Why do I still get /dev/sd* entries? Any clues anyone? Cheers, Terry.
