[lkml]   [1999]   [Oct]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Subjectscsi disk detection and /dev names, RE: My $.02 on the raging de vfs debate
>     Ok.  I like being able to address SCSI devices by their 
> target ID's too.
> However wouldn't it be simplier to just modify the SCSI
> drive,tape,CDROM,etc
> drivers to have their devices hardcoded to /dev/scsi/c0t0d0 and so on?

this for me is the 'killer' feature of devfs. eg a disk in a server died on
me the other day. so i used the 'echo "scsi add/remove ..." > /proc...'
feature to hot swap it.

without devfs above would have resulted in the disk getting a different name
after rebooting, not nice. with devfs.. no problem. The reason being that
linux keeps track of disks in order of detection, so with a static
preallocated /dev all you can say for sure is that 8:0 will be the first
detected disk, 8:1 the second.. etc. However the scsi disk layer does know
at detection time which host/bus/id/lun the newly detected disk is on, so
with devfs can register a descriptive name for it.

So devfs is a quick workaround of this limitation rather than being a real
cure (for this particular prob). If anyone with the coding skills is
listening, it'd be great if static /dev could support location based disk
names too.

-paul jakma.

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
Please read the FAQ at

 \ /
  Last update: 2005-03-22 13:54    [W:0.085 / U:2.564 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site