Hi,
(My question is at the end of all this.) I have a couple of machines running
RHEL 5.2/5.3. On machine 1, when I plug in a usb external hard drive, both the
character and block devices show up just as you would expect. Here is part of
a "ll -tr /dev" right after I plug in the usb drive:
crw------- 1 root root 442, 6 Apr 20 10:33 usbdev1.7_ep00
crw------- 1 root root 442, 6 Apr 20 10:33 usbdev1.7_ep01
crw------- 1 root root 442, 6 Apr 20 10:33 usbdev1.7_ep81
crw------- 1 root root 21, 0 Apr 20 10:33 sg0
brw-r----- 1 root disk 8, 16 Apr 20 10:33 sdb
drwxr-xr-x 6 root root 120 Apr 20 10:33 disk
The block device corresponding to the usb external hard drive shows up as
/dev/sdb and I can mount and umount it just fine. I take the same device, plug
it into machine 2, only the character devices show up:
crw------- 1 root root 442, 6 Apr 20 12:47 usbdev1.7_ep00
crw------- 1 root root 442, 6 Apr 20 12:47 usbdev1.7_ep81
crw------- 1 root root 442, 6 Apr 20 12:47 usbdev1.7_ep01
One thing to note is that machine 2 already has /dev/sda* and /dev/sdb*, which
are its hard drives:
brw-r----- 1 root disk 8, 0 Mar 26 15:51 /dev/sda
brw-r----- 1 root disk 8, 1 Mar 26 15:51 /dev/sda1
brw-r----- 1 root disk 8, 2 Apr 15 08:27 /dev/sda2
brw-r----- 1 root disk 8, 16 Mar 26 15:51 /dev/sdb
brw-r----- 1 root disk 8, 17 Apr 15 08:27 /dev/sdb1
Also, here is what is in /dev/disk on machine 2 :
/dev/disk:
total 0
drwxr-xr-x 2 root root 140 Mar 26 15:51 by-id
drwxr-xr-x 2 root root 60 Mar 26 15:51 by-label
drwxr-xr-x 2 root root 160 Mar 26 15:51 by-path
drwxr-xr-x 2 root root 60 Mar 26 15:51 by-uuid
/dev/disk/by-id:
total 0
lrwxrwxrwx 1 root root 9 Mar 26 15:51 scsi-SATA_ST3300831AS_4NF0GMJ5 ->
../../sdb
lrwxrwxrwx 1 root root 10 Mar 26 15:51 scsi-SATA_ST3300831AS_4NF0GMJ5-part1
-> ../../sdb1
lrwxrwxrwx 1 root root 9 Mar 26 15:51 scsi-SATA_ST3300831AS_4NF0GYNL ->
../../sda
lrwxrwxrwx 1 root root 10 Mar 26 15:51 scsi-SATA_ST3300831AS_4NF0GYNL-part1
-> ../../sda1
lrwxrwxrwx 1 root root 10 Mar 26 15:51 scsi-SATA_ST3300831AS_4NF0GYNL-part2
-> ../../sda2
/dev/disk/by-label:
total 0
lrwxrwxrwx 1 root root 10 Mar 26 15:51 boot -> ../../sda1
/dev/disk/by-path:
total 0
lrwxrwxrwx 1 root root 9 Mar 26 15:51 pci-0000:00:1f.1-ide-0:1 -> ../../hdd
lrwxrwxrwx 1 root root 9 Mar 26 15:51 pci-0000:00:1f.2-scsi-0:0:0:0 ->
../../sda
lrwxrwxrwx 1 root root 10 Mar 26 15:51 pci-0000:00:1f.2-scsi-0:0:0:0-part1
-> ../../sda1
lrwxrwxrwx 1 root root 10 Mar 26 15:51 pci-0000:00:1f.2-scsi-0:0:0:0-part2
-> ../../sda2
lrwxrwxrwx 1 root root 9 Mar 26 15:51 pci-0000:00:1f.2-scsi-1:0:0:0 ->
../../sdb
lrwxrwxrwx 1 root root 10 Mar 26 15:51 pci-0000:00:1f.2-scsi-1:0:0:0-part1
-> ../../sdb1
/dev/disk/by-uuid:
total 0
lrwxrwxrwx 1 root root 10 Mar 26 15:51 changed-to-hide-this-blah-blah-blah
-> ../../sda1
Here is some information on the two machines:
Machine 1:
64-bit, 8 core, 4GB RAM, SAS hard drives, uname -a says: ...
2.6.18-128.1.6.el5xen #1 SMP Tue Mar 24 12:28:27 EDT 2009 x86_64 x86_64 x86_64
GNU/Linux
Machine 2:
32-bit, 2 core, 2GB RAM, SATA hard drives. uname -a says: ...
2.6.18-128.1.1.el5xen #1 SMP Mon Jan 26 14:34:58 EST 2009 i686 i686 i386
GNU/Linux
Does anyone have a clue as to why the block device is not showing up on machine
2 and how I can make it show up?
Thank you,
Bob
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