Date: Sat, 25 Feb 2012 04:27:30 -0600 (CST) From: Scott Bennett <bennett@cs.niu.edu> To: Erich Dollansky <erich@alogreentechnologies.com> Cc: freebsd-stable@freebsd.org Subject: random problem with 8.3 from yesterday Message-ID: <201202251027.q1PARURH021975@mp.cs.niu.edu>
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On Wed, 22 Feb 2012 13:34:36 +0700 Erich Dollansky
<erich@alogreentechnologies.com> wrote:
>I got a new thumb drive which was FAT formatted. I use this script to change this:
>
>!/bin/tcsh
>#
># This script format a thumb drive connected to USB as da0.
>#
>printf "You have to run this script as 'root' to succeed.\n"
>printf "Warning this script will delete all your data from /dev/da0. Continue? > "
>set Eingabe = $<
>if ("$Eingabe" == "y") then
> printf "\nDeleting the device "
> dd if=/dev/zero of=/dev/da0 bs=1k count=1
> printf "\nWriting the BSD label "
> bsdlabel -Bw da0 auto
Hmmm...so no MBR and no GPT either? Just the bare device? I guess
I haven't tried that, so I don't know what that would do.
> printf "\nEditing the BSD label "
> bsdlabel -e da0
> newfs /dev/da0a
> printf "\nThe device /dev/da0 was formated to be used with FreeBSD.\n"
>else
> printf "\nScript aborted!\n"
>endif
>
>I then call manually
>
>tunefs -L NewDeviceName /dev/da0a
Just out of curiosity, I'd like to know why you run tunefs manually,
rather than using "-L NewDeviceName" on the newfs command, given that your
script is clearing the physical device and then creating an empty file
system.
>
>Either this call or the mount command does not work randomly.
>
>When I then try to mount the device on /dev/da0a it does not work always.
What do you mean when you write "mount the device on /dev/da0a"?
Normally one mounts a filesystem onto a "device", e.g.,
mount /dev/ad0s1d /var
or some similar thing. Also, why do you refer to /dev/da0a at all if you
labeled the file system? The whole point of labeling the file system is
supposed to be so that you can mount it independently of the physical
device name, e.g.,
mount /dev/ufs/NewDeviceName /thumbfs
which allows you to have an entry in /etc/fstab for mounting the file
system that doesn't need to be edited every time you reboot the system or
move devices around.
>
>I do not know what this causes, I am only randomly able to reproduce it.
>
>It might be affected by removing the device or keeping it plugged in.
Well, yes, that's what you label partitions/devices to avoid having
to deal with manually, right?
>
>uname says:
>
>FreeBSD AMD620.ovitrap.com 8.3-PRERELEASE FreeBSD 8.3-PRERELEASE #28: Tue Feb 21 17:15:07 WIT 2012 erich@AMD620.ovitrap.com:/usr/obj/usr/src/sys/AsusAMD620 amd64
>
>dmesg says:
>
>ugen1.2: <vendor 0x1005> at usbus1
>umass0: <vendor 0x1005 USB FLASH DRIVE, class 0/0, rev 2.00/1.00, addr 2> on usbus1
>umass0: SCSI over Bulk-Only; quirks = 0x4001
>umass0:2:0:-1: Attached to scbus2
>da0 at umass-sim0 bus 0 scbus2 target 0 lun 0
>da0: < USB FLASH DRIVE PMAP> Removable Direct Access SCSI-0 device
>da0: 40.000MB/s transfers
>da0: 15272MB (31277056 512 byte sectors: 255H 63S/T 1946C)
>
>It is not an urgent problem.
>
It most likely is not a problem at all. See
http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/geom-glabel.html#AEN27470
With best regards,
Scott Bennett, Comm. ASMELG, CFIAG
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