On Wed, January 7, 2009 10:54 am, Mike Myers wrote: > > With 15 hotswap drives in the system, I can tell you that device name > changing is fraught with peril. I am unfamilar with the /dev/disk/by-uuid > functionality. Is that documented in a howto somewhere? How is that > supposed to work? > /dev/disk/by-id is probably the one you want. I don't know about documentation, but if you ls -l /dev/disk/by-id | grep -v part and have a look it should make sense. I get: lrwxrwxrwx 1 root root 9 2009-01-07 11:10 ata-ST3160812AS_4LS5YYHQ -> ../../sda lrwxrwxrwx 1 root root 9 2009-01-07 11:10 ata-ST3160812AS_4LS5YZDG -> ../../sdf lrwxrwxrwx 1 root root 9 2009-01-07 11:10 ata-ST3160812AS_4LS5YZJQ -> ../../sdc lrwxrwxrwx 1 root root 9 2009-01-07 11:10 ata-ST3160812AS_4LS5Z05D -> ../../sdd lrwxrwxrwx 1 root root 9 2009-01-07 11:10 ata-ST3160812AS_4LS5Z0B6 -> ../../sde lrwxrwxrwx 1 root root 9 2009-01-07 11:10 ata-ST3160812AS_4LS5Z0BH -> ../../sdb lrwxrwxrwx 1 root root 11 2009-01-07 11:10 md-uuid-8fd0af3f:4fbb94ea:12cc2127:f9855db5 -> ../../md_d6 lrwxrwxrwx 1 root root 9 2009-01-07 11:10 scsi-SATA_ST3160812AS_4LS5YYHQ -> ../../sda lrwxrwxrwx 1 root root 9 2009-01-07 11:10 scsi-SATA_ST3160812AS_4LS5YZDG -> ../../sdf lrwxrwxrwx 1 root root 9 2009-01-07 11:10 scsi-SATA_ST3160812AS_4LS5YZJQ -> ../../sdc lrwxrwxrwx 1 root root 9 2009-01-07 11:10 scsi-SATA_ST3160812AS_4LS5Z05D -> ../../sdd lrwxrwxrwx 1 root root 9 2009-01-07 11:10 scsi-SATA_ST3160812AS_4LS5Z0B6 -> ../../sde lrwxrwxrwx 1 root root 9 2009-01-07 11:10 scsi-SATA_ST3160812AS_4LS5Z0BH -> ../../sdb which shows you my 6 drives (each listed twice) with their model numbers and serial numbers. If I move the drive around, they will get different 'sda' names, but if you look at the lines in disk/by-id you can be sure that a given name will always refer to the same physical device. This is all managed by 'udev'. NeilBrown -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
