|
|
|
|
|
|
| Author |
Message |
Strangelite@gmail.com
*nix forums beginner
Joined: 21 Feb 2005
Posts: 3
|
 Posted: Fri Feb 18, 2005 8:33 am Post subject:
USB HD SCSI ID Problem
|
|
|
Apologies if this is not the right place.
I have a slackware 10.1 linux System with 6 SATA HD's in it - they
appear as /dev/sda-f -
I also have 6 USB external HD [used as a backup system] - never at the
samne time - but they change 1 /day
the 1st two days are OK as the USB HD show up as
/dev/sdg then /dev/sdh
I hope you can see where I'm going with this...
when I add the 3rd USB HD - I run out of SCSI ID letters in /dev/ -
i.e. there is no
/dev/sdi-m
now the qestion -
how do I add extra sd devies to /dev ?
or is that not sensible ?
or how do I find my extra USB HD in the system and get them mounted?
All help gladly received. |
|
| Back to top |
|
 |
Dances With Crows
*nix forums Guru
Joined: 01 Mar 2005
Posts: 328
|
| Posted: Fri Feb 18, 2005 2:07 pm Post subject:
Re: USB HD SCSI ID Problem
|
|
|
On 18 Feb 2005 01:33:00 -0800, Strangelite@gmail.com staggered into the
Black Sun and said:
| Quote: | Apologies if this is not the right place.
|
Right place, wrong Subject: . USB devices don't *have* SCSI IDs; the
SCSI device nodes are used because USB Mass Storage commands are pretty
similar to SCSI commands.
| Quote: | I have a slackware 10.1 linux System with 6 SATA HDs in it - they
appear as /dev/sda-f . I also have 6 USB external HDs. the 1st two
days are OK as the USB HD show up as /dev/sdg then /dev/sdh
when I add the 3rd USB HD - I run out of SCSI ID letters in /dev/ -
i.e. there is no /dev/sdi-m
how do I add extra sd devies to /dev ? or is that not sensible ?
|
Of course it's sensible to want to add devices to a static /dev. The
default Slackware installation only includes /dev/sd[a-h] because not
that many people have more than 8 SCSI disks, and the people who do have
that many SCSI disks are assumed to know how to use mknod. "man mknod",
then check /usr/src/linux/Documentation/devices.txt for the major and
minor numbers you need. /dev/sd[i-m] all have major 8, minors vary, so
you could do this:
MINOR=128 # minor for /dev/sdi
for DEV in i j k l m ; do
mknod /dev/sd$DEV b 8 $MINOR
let MINOR=$MINOR+16
done
....this only creates device nodes for the whole disks. If you need
nodes for the partitions on the disks, you'll have to modify the script.
| Quote: | or how do I find my extra USB HD in the system and get them mounted?
|
Slackware is not really for the novice user. If you are a novice user,
you will have a much better time with another distro. HTH,
--
Matt G|There is no Darkness in Eternity/But only Light too dim for us to see
Brainbench MVP for Linux Admin / mail: TRAP + SPAN don't belong
http://www.brainbench.com / Hire me!
-----------------------------/ http://crow202.dyndns.org/~mhgraham/resume |
|
| Back to top |
|
|
John-Paul Stewart
*nix forums Guru
Joined: 20 Feb 2005
Posts: 497
|
| Posted: Fri Feb 18, 2005 2:51 pm Post subject:
Re: USB HD SCSI ID Problem
|
|
|
Strangelite@gmail.com wrote:
| Quote: | Apologies if this is not the right place.
I have a slackware 10.1 linux System with 6 SATA HD's in it - they
appear as /dev/sda-f -
I also have 6 USB external HD [used as a backup system] - never at the
samne time - but they change 1 /day
the 1st two days are OK as the USB HD show up as
/dev/sdg then /dev/sdh
I hope you can see where I'm going with this...
when I add the 3rd USB HD - I run out of SCSI ID letters in /dev/ -
i.e. there is no
/dev/sdi-m
|
I see you've already recieved a good answer about creating more entries
in /dev. But I'll also point out that if you unload the usb-storage
module (after removing the USB drive), the kernel will "forget" about
it. Then you reload the module, plug in the next drive, and it will be
/dev/sdg. So by loading and unloading the module you'll always have
your backup at /dev/sdg, if you want.
BTW, it's not entirely clear to me what will happpen after you've used
/dev/sdm. When you re-attach the first hard drive it may not get
re-assigned its former designation of /dev/sdg. It might get /dev/sdn
instead. IOW, there's a chance that the system will just keep counting
until you unload/reload the usb-storage module, reboot, or run out of
SCSI disk nodes (of which there are 256 possibilities). |
|
| Back to top |
|
|
Anton Ertl
*nix forums addict
Joined: 20 Feb 2005
Posts: 91
|
| Posted: Sat Feb 19, 2005 8:43 am Post subject:
Re: USB HD SCSI ID Problem
|
|
|
Strangelite@gmail.com (Strangelite@gmail.com) writes:
| Quote: | I also have 6 USB external HD [used as a backup system] - never at the
samne time - but they change 1 /day
the 1st two days are OK as the USB HD show up as
/dev/sdg then /dev/sdh
|
Yes, I have seen this on some kernels. However, the 2.6.5 kernel I
use at home and the 2.6.9 kernel on my laptop seem to always assign
the first free SCSI id to USB-storage devices.
So, I suggest that you try a new kernel.
- anton
--
M. Anton Ertl Some things have to be seen to be believed
anton@mips.complang.tuwien.ac.at Most things have to be believed to be seen
http://www.complang.tuwien.ac.at/anton/home.html |
|
| Back to top |
|
|
Google
|
|
| Back to top |
|
|
|
|
The time now is Fri Jan 09, 2009 8:37 am | All times are GMT
|
|
Problem Mortgage | Loans | Loans | Credit Cards UK | Actress
|
|
Copyright © 2004-2005 DeniX Solutions SRL
|
|
|
|
Other DeniX Solutions sites:
Unix/Linux blog |
electronics forum |
medicine forum |
science forum |
|
|
Privacy Policy
|
Powered by phpBB © 2001, 2005 phpBB Group
|
|
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
Forum index
»
*nix
»
Linux
»
hardware
