General :: Mount Custom Device Node (ex: "/dev/mydevice")

Jun 16, 2010

I'm trying to mount a custom device node for each usb port of my pc. For example: Every pen drive connected to my usb 1-1.2 will be called /dev/usb2 and mounted on /mnt/usb2, on usb 1-1.3 port the device node will be called /dev/usb3 and mounted on /mnt/usb3.

I'm using an embedded linux, the device handler is mdev. Editing mdev.rules I'm able to manage new devices and write special rules for them (on /bin/ I can mount the /dev/udisk device on anywhere I wanna):

# This will be called after scsi emulation, so the
# new device (sda1, sdb1 ...) will be managed by /bin/
mmcblk0p10:00600=sdcard */bin/
sda10:00600=udisk * /bin/


Is there anyway to change scsi emulation configurations or code? I want to call my pen drive on my way (/dev/usb1 instead of /dev/sd*)!

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General :: Ubuntu - Find The Device Node File For USB Device?

Aug 23, 2011

I've bought an X10 Home Automation USB interface: the CM15.

This is the information lsusb gives:

skerit@KIP-DU-SKER:~$ lsusb Bus 008 Device 002: ID 0bc7:0001 X10 Wireless Technology, Inc. ActiveHome (ACPI-compliant)

But this tells me nothing about where the device file is! How can I find that, or create one myself?

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General :: Mount USB Disk On Debian Etch That Doesn't Have A Module Node

Apr 2, 2010

I have a machine that has an integrated USB flash drive somewhere in it that I can not seem to mount. The OS knows it is there, as I can see it in the dmesg output, but the actual "node" in /dev doesn't actually exist. I'm baffled. Will you help me figure this out? Here's what I came up with so far. The disk is attached to the USB bus, used as a SCSI block device. In dmesg, it is referred to at one point as sdf, as well as under /sys/class/scsi_device. When I go check /dev, /dev/sdf does not exist!:


cat /proc/bus/usb/devices
T: Bus=02 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 2 Spd=480 MxCh= 0
D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
P: Vendor=090c ProdID=1000 Rev=11.00


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General :: Make A DRBD Node Start Itself As A Primary Node Automatically?

Jan 28, 2010

I've set up DRBD on 2 machines, 1 of them is the master, another is the slave.

After each bootup, I need to run the following on the master machine:

drbdadm -- --overwrite-data-of-peer primary all

Do we need to specify which machine should be the primary node every time? Is there any method to make the machine "know" it's itself the primary node?

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Hardware :: SCSI Hard Disk Device Node Creation

Mar 26, 2010

I am developing for a Linux based device for which the HOT PLUG option is deactivated. As part of optimizing the code, we also don't want to create device files for unused devices. We understand that both USB attached and fixec SCSI hard disks would create device files like /dev/sda,/dev/sda1 /dev/sdb, /dev/sdb1 etc. Is this understanding correct?

In the case of USB attached SCSI devices, would driver create this device file entry? How is it created? Can somebody please tell me how it is being created automatically. In case I attach a fixed SCSI hard disk before boot up(and create device file /dev/sda1), would USB SCSI device driver create device files starting from /dev/sdb, automatically.

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Software :: Udev Creates External USB HD Device Node Too Late

May 22, 2010

On my debian lenny OS I have an external usb hard disk I would like to automount it at boot. So I edited the /etc/fstab file in order to automount /dev/sdb1. It worked without problem. Then I recompiled the kernel and, as consequence, /dev/sdb1 changed to /dev/sdc1. I started playing with udev in order to match the now called /dev/sdc1 and to change its name in /dev/maxtor (being maxtor the brand of the hard disk). Obviously I edited also /etc/fstab: /dev/sdb1 is now /dev/maxtor.

The boot automount doesn't work anymore. On the boot sequence I can read the message "Mounting local filesystem...mount: special device /dev/maxtor does not exist FAILED". But when I log into the system I can run the command "mount /dev/maxtor /mnt/maxtor" and it works! So, IMHO, my udev rule is correct otherwise also the manual mount wouldn't work, right? I have to tell to udev to create /dev/maxtor BEFORE the boot automount process.

I tried to delete my udev rule and to edit /etc/fstab changing /dev/maxtor in /dev/sdc1 (the name udev gave to my hard disk after kernel recompile, before was /dev/sdb1) and it didn't work: on boot process I always see the "Mounting local filesystem...mount: special device /dev/sdc1 does not exist Failed". Then I tried to change /dev/sdc1 in /dev/sdb1 in /etc/fstab and to reboot with the old original kernel and int this way it works. With my compiled kernel, the OS seems to have lost the capacity to detect my device node correctly.

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Hardware :: Device Node Assignment At Boot / Parallel Printer Via USB Adapter

May 5, 2011

I have a printer that is not getting a device node assigned at boot.The printer is attached with a USB to Parallel (IEEE-1284) adapter cable.When I plug in the usb cable when the machine is running, the printer is assigned the device node: /dev/usb/lp0

I am guessing that during startup, the printer device is not detected since it is plugged in over an adapter cable which may be considered a device in itself?This is for a retail store, and we rely on the printer to pop the cash drawer open, so it kinda has to work without a "secret handshake".Unfortunately our workstations do not have Parallel ports. I would be happy to share terminal output, udev info, I'll write you a poem but I could sure use a helping hand- I'm stumped!

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Slackware :: KODAK DX4330 Digital Camera Detected But Not Assigned Device Node

Jul 7, 2010

This device doesn't automount, doesn't show in KDE 4's device notifier, and I can't mount this camera manually because it doesn't appear to get assigned to a device node. Any known solutions? It worked in Slackware 12.2, but not in 13.0 or 13.1.

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Programming :: KSH Script Behaving Differently On An HACMP Cluster Node (prod) & A Single Node (UAT)?

Dec 16, 2010

I have created a simple menu driven script for our Operations to take care of the basic monitoring and managing of our production application from the back-end. Now, the script when tested in UAT environment was fine, but when deployed to production it kind of behaved oddly.hen the Operator chooses an option from the menu he is given the output and at the end is prompted to return to the main menu by using ctrl+c. In production, this return does not occur for some strange reason and the program just sits there.The session becomes unresponsive after that and I'm forced to terminated it by closing the PuTTY.I tried enabling the debug mode too (set -x) and still was not able to find any useful hints/trails as to why.

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CentOS 5 Networking :: Setup The Cluster To Automatically Failover The Service To Another Node Case One Node Fails?

Mar 1, 2011

I am familiar with windows 2008 cluster servers, and I just started testing with centos cluster. I am creating a simple 2-node cluster, for a simple ping test.

Node 1:
Node 2:
Virtual ip:

So far, I can ping a virtual ip, and manually relocate it between the nodes, but I didn't figure out, how to do this automatically. So this is my question: How can I setup the cluster, to it automatically failover the a service to another node case one node fails?

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Server :: Node Failover And Another Node Take Over Resources On HA Cluster?

Oct 27, 2010

I don't have much experience in clustering. And I'm deploying a cluster system on CentOS.But I don't know how long a node failover and another node take over those resouces to continue running service is good, fast or slow? 1s, 10s or

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General :: Cannot Find USB Device To Mount?

May 23, 2011

How can I find which /dev/? device to mount my USB hard drive on redhat 3 taroon, I've been googling a lot and checked log files and still no clue. I'm trying my last chance with you experts, # /sbin/fdisk -lgives nothing about the USB drive

# lsusb -vv
Bus 004 Device 005: ID 059f:0951 LaCie, Ltd
Device Descriptor:


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General :: Set Up Usb Device To Be Available To Mount And Not For Other Users?

May 18, 2010

I am trying to set up my usb device to be available to mount and umount only for me, not for other users. Using Slackware 12.2Entry in fstab is as follows:

/dev/disk/by-label/USB /media/usbvfat auto,group,user,noexec,gid=usb,umask=007 0 0
device information:


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General :: Can't Mount Usb Disk - It Just Create /dev/sg Device But No /dev/sd

Dec 23, 2010

I have a Corsair R60 ssd disk which is a disk with both sata and usb connectors. But the usb thing seems to be a bit non-standard, or maybe its just my fedora linux.When I insert the disk using a usb cabel to a running Fedora 14 linux system, a device called /dev/sg3 is added but that is all. No new /dev/sd* device is created so I can't mount the disk.

If I look at

cat /proc/scsi/sg/device_strs

I get

ATA Hitachi HTS54321 FB2O
Seagate Desktop 0130
Corsair CSSD-R60GB2

So the disk is there. (The last entry) but my linux will for some reason not see it as a usb hard disk. When I insert other usb disks they work fine. It is only this specific disk which causes problems. I have tried on 3 different computers with the same result.

A hint to the problem may be that if I add the disk to a windows system(With usb) the disk is called "A fixed disk" and not a portable disk as expected. The disk works fine with linux If i connect it with the sata cabel, but I would really like to have it working with usb too. (To mount it on computers without sata).

Added:I did try to mount /dev/sg3 but mount say that its not a block device. (File say Its a character special device).

Added output from dmesg:

[ 97.454073] usb 7-1: USB disconnect, address 2
[ 105.913055] hub 2-0:1.0: unable to enumerate USB device on port 3
[ 107.048054] usb 2-3: new high speed USB device using ehci_hcd and address 5
[ 107.162900] usb 2-3: New USB device found, idVendor=1b1c, idProduct=1ab8


I found an other guy with exactly the same problem [URL] so I think its beginning to look like a bug in the drives firmware or in the linux kernel.

Final update:Corsair have said that the disk design is broken and there does not seem to be any way to make it work.

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General :: Cannot Mount Hotpluggable Device In Xfce

Mar 27, 2010

i can't mount my USB flash disk using GUI... trough normal "mount" command it works fine, but i want to make it automatic. here is error output:

Rejected send message, 1 matched rules;
type="method_call", sender=":1.13" (uid=1000 pid=2301 comm="exo-mount)
member="Mount" error name="(unset)" requested_reply=0
destination="org.freedesktop.Hal" (uid=0 pid=1488 comm="/usr/sbin/hald))

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General :: Mount Error 6 = No Such Device Or Address

Feb 10, 2011

[root@servers guest]# /bin/mount -o -uid=root,gid=root,username=userid,password=user1passwd // /mnt/tmp

retrying with upper case share name
mount error 6 = No such device or address
Refer to the mount.cifs(8) manual page ( mount.cifs)
[root@servers guest]#

I also tried:

[root@servers guest]# /bin/mount -t cifs -o -uid=root,gid=root,username=user1,password=user1pass // /mnt/tmp

but no luck!

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General :: Get Fstab To Auto-mount A Removable Device?

Feb 23, 2010

I'm trying to get fstab to auto-mount a removable device when its plugged in? Is this possible and if not what is the easiest way to auto-mount a removable device?

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General :: Mount - Filesystem Handling For Embedded Device?

Jan 21, 2011

I am developing a device that will run Linux as its operating system.The device is a small form factor X86 device with a flash drive exposed as a SATA-device. So it is not very dissimilar from any other PC running Linux.For several good reasons I am building my own "distribution", instead of using an existing one.What confuses me is how mount/umount of the root file system is handled.I boot my kernel with the commandline "root=/dev/sda1 rw" which works fine. But everytime I do poweroff or reboot Busybox complained about no /etc/fstab, so I decided to build one.Should I have an entry for my root file system? It seems like this is shadowed by the rootfs anyway. I.e. if I have the fstab entry "/dev/sda1 / ext2 1 1" mount still reports rootfs on / type rootfs (rw)/dev/root on / type ext2 (rw,relatime,errors=continue)My questions are:Do I need to worry? Will the drive be correctly unmounted by the kernel on poweroff/reboot?If I want to perform file system checking on boot, can I do that without resorting to an initrd?

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General :: Alias A Device For The Mount Command In RedHat 9?

Aug 9, 2011

I have a program which mounts /dev/sdb1 for which I lack the source code. This device does not exist on my RedHat 9 system and I want to create /dev/sdb1 such that it's an alias for /dev/hdb1 Can I do this? with MAKEDEV?

I need to have an alias which will allow it to mount, not create a symbolic link to an already mounted directory. i.e. 'mount /dev/sdb1 /mnt/harddrive' should actually mount /dev/hdb1

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General :: Mount: Special Device /dev/scd0 Does Not Exist

Jul 3, 2010

mount: special device /dev/scd0 does not exist

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General :: Mount USB Drive - Device Pointers Static?

Jun 6, 2011

I'm using an external USB drive to perform system backups. The script I'm using has a mount command - mount /dev/sdcx /systembak, it works fine until the external drive is mounted into a different USB port which causes the device path to change and the script needs to be modified to reflect that change. Looking in the /dev/disk/ directory I see ./by-id ./by-label ./by-path ./by-uuid. I've been able to mount the disk using one of the device pointers in those directories; are any of those device pointers static or do they change every time the USB disk is plugged into a different USB port.


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General :: Unable To 'mount' And Use Itouch 8Gig Device / Fix It?

Jan 7, 2010

What do I call this device in /etc/fstab. Currently the line I'm using is... code...

Having made a mount directory (/media/ipod) an error message tells me
... mount: special device /dev/sdc0 does not exist...
when I try to mount it.

I cannot see it in 'gparted' or 'disk utility' but I can see it on sys log and kern log when I plug it in and remove it.

I have visited several help forums and loaded several types of recommended software (ifuse-libs and mux's etc) but with no satisfactory result.

I have successfully 'Jail broken' the device using 'Blackra1n' on a windows machine.

It used to appear on the desktop but more. I've obviously broken something!

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General :: View Contents Using Dolphin Before Mount Device

Oct 14, 2010

How come I can view the contents of the drive using Dolphin before I mount the device? I cannot see the contents using the bash shell until the device is mounted.

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Ubuntu :: Fresh 9.10 Install Reboot Error No Device - Mount Partition Mount: Can't Fin?

Jun 24, 2010

what now trying to mount partition get this error this is the partition ubuntu 9.10 is installed on and upon reboot error no device with a long string. mount: can't find /dev/sda6/mnt in /etc/fstab or /etc/mtab

so now that I believe I've successfully mounted the partition how do I direct the bootloader to this partition /dev/sda6 on /media/11076e45-e27d-470b-bb6d-6894f7809a0c type ext4 (rw,nosuid,nodev,uhelper=devkit)

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General :: Permissions - Mount Device With Specific User Rights?

Aug 8, 2011

How can I mount a device with specific user rights on start up? I still have some problems figuring it out. I would like to mount the divide with uid=1000 and gid=1000. My current entry to the /etc/fstab/ file looks like this:

dev /var/www vboxsf rw, suid, dev, exec, auto, nouser, async, uid=1000

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General :: Command To Display The Device-fs-uuid-mount Point?

Oct 26, 2010

I need a command to display the next info from my hdd:

device name - filesystem - uuid - mount point

I found blkid but the mount point is not displayed, I've already look in man but there is no parameter for that

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General :: Mount -t Vfat /dev/sda1 /var/card - No Device Or Address

Jun 23, 2010

Found a raw device for my card when reading through the /proc/partition list but got a "no device" message when mounting the card - mount -t vfat /dev/sda1 /var/card though there is sda in the list.How to know if sda1 exists?

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Server :: NFS Mount On 2 Node "cluster"?

Nov 16, 2010

We have a set of two production machines running Oracle databases. There are a couple of SAN attached filesystems of which one of them on the one machine (node1) is created as ext3 and nfs exported to the second machine (node2). However,during certain conditions related to rac, the interconnect between the two nodes lose connection and due to the loss of communication the servers will reboot. The problem however is that node2 usually reboots first and by the time it starts up, node1 is not up and running yet, thus causing the nfsmount to not be available on node2. I have put my head around some options on how to get the servers to automatically resolve this, however I am posting my question here as someone might have a reliable way of managing this. My one idea is to create a script on node2 to mount the nfs filesystem, create ssh key authenticated user between the nodes and then put another script in place on node1 as part of the startup to ssh to node2 and mount the filesystem.

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General :: Cannot Mount Hard Disk: Block Count Exceeds Size Of Device

May 11, 2011

I have one hard disk (call her HDA) that contains nothing but a single ext4 partition containing a backup of all my important data. Last night I did a clean install of Ubuntu 10.10 on my primary hard disk (call her HDB) and from there proceeded to upgrade directly to Ubuntu 11.04 upgrade. In 10.10, I was able to read HDA just fine. However after the upgrade, I can no longer mount this drive. When mounting from file browser:


Error mounting: mount: wrong fs type, bad option, bad superblock on /dev/sda,missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so The end of dmesg said the following:


dmesg | tail
[ 82.130904] EXT4-fs (sda): bad geometry: block count 122096646 exceeds size of device (122096381 blocks)

my hard disk has a block count greater than the size of my device. I've done my background searching on this and tried a command line utility I've never heard of before:


# sudo e2fsck /dev/sda
e2fsck 1.41.14 (22-Dec-2010)
The filesystem size (according to the superblock) is 122096646 blocks
The physical size of the device is 122096381 blocks


this is as far as I've gotten. This drive holds over a decade's worth of work for me and is extremely valuable. I really didn't think that the Ubuntu upgrade process would mess with this drive, seeing as the Ubuntu install was contained on an entirely different drive. What is it that I need to do to restore my drive to working status?

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CentOS 5 :: Figure Out The "Device" Name From The "Sysfs" Node?

Jun 12, 2011

How can I figure out the "Device" name from the "Sysfs" node? e.g. [root@baba 0000:00:01.0]# lspci | grep -i Ethernet
00:19.0 Ethernet controller: Intel Corporation 82566DC Gigabit Network Connection (rev 02)

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