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manny15
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Joined: 01 Dec 2002
Posts: 473
Location: USA
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 Posted: Fri Jan 31, 2003 5:28 pm Post subject: Is hotplug useful for usb mass devices |
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Hey, I've noticed that if I plug in a usb mass storage device after I'm logged in, the /dev/X entries don't get created. For example, if I plug in my usb zip drive and try to mount it I get
mount: special device /dev/sda4 does not exist
But if I log out, log back in, and try again it works. Actually, the drive makes "noises" when I log out as it reads the disk. Oh, I did put in a disk before pluggin it in. I thought hotplug solves this but I get the same behaivor. Maybe I need to add some kind of script, but I can't seem to find examples or good documentation of how hotplug works and how to set it up. Any ideas? |
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Carlos
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Joined: 07 Aug 2002
Posts: 458
Location: Providence, RI
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| Posted: Thu Feb 06, 2003 4:07 am Post subject: |
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This sounds like something relating to /etc/devfsd.conf; I think you need to find out what the symlink /dev/sda4 (or whatever the device that fails to reappear is) points to (it'll be something like /dev/scsi/host1/bus0/target0/lun1/part1), and edit devfsd.conf accordingly - sadly I don't quite know how to do that myself yet.
ejwahl's message in USB Hard Drive should be helpful, though.
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Man must shape his tools lest they shape him. |
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manny15
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Joined: 01 Dec 2002
Posts: 473
Location: USA
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| Posted: Thu Feb 06, 2003 3:26 pm Post subject: |
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Thanks for the help. I got it working now. Here's what I did. I plugged in the usb zip drive and did a dmesg to get the proper scsi stuff which is where I got
| Code: |
scsi/host1/bus0/target0/lun0
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Then I edited /etc/devfsd.conf
and added
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# Create /dev/sda4 for the external USB drive
LOOKUP ^sda4 CFUNCTION GLOBAL mksymlink scsi/host1/bus0/target0/lun0/part4 sda4
REGISTER ^scsi/host1/bus0/target0/lun0/part4 CFUNCTION GLOBAL mksymlink $devname sda4
UNREGISTER ^scsi/host1/bus0/target0/lun0/part4 CFUNCTION GLOBAL unlink sda4
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I send the HUP signal to the devfsd process using "kill". Then replug the zip drive. And mount /mnt/zip then worked. I didn't have to log out! Thanks! Now I plan to do the same with my usb cdrw. |
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Carlos
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Joined: 07 Aug 2002
Posts: 458
Location: Providence, RI
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| Posted: Fri Feb 07, 2003 2:01 am Post subject: |
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| manny15 wrote: | | Thanks for the help. |
No problem; thanks for posting details on what you did because I think I'll be able to make my setup better too - until now I've had the problem of not being able to use slots in my USB card reader unless a device was in it when booting.
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Man must shape his tools lest they shape him. |
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