Hardware :: Block Device Names Change After Reboot
Jan 19, 2011
I built a Raid5 volume with 3 SATA II hard disk drives. Further I have a system disk conected through IDE. During the first setup the IDE disk becomes sda, the SATA II disk sd[bcd] respectively. Now, sometimes the device names change after reboot - why ever... E.g. one of the raid5 disk become sda and so I got an error message during the boot procedure regarding the raid set. Curious, when the system is up and I stop and restart the Raid5 volume it comes up and runs fine. Because I'm currently at work I can't post any more detailed config files at the moment.
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May 2, 2011
After I reboot my Ubuntu 10.04.2 LTS l machine my device paths change (even the boot drive) and this causes havoc on my two RAID5 arrays. The device paths change and causes a mismatch in my fstab and I have to manually mount both RAID arrays every time. It's quite frustrating and annoying and I would love for it to stop. This even happens for the boot path.
Example: my boot path is /dev/sde5 I reboot my machine and my boot path changes to /dev/sdm5
Why does this happen? And more importantly how can I stop it from happening so it stops messing with my RAIDs?
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Apr 25, 2011
I have many disks and volumes in my system. Some of disks IDE, some SATA.
Volumes on SATA disks cause me problems - I have them listed in etc/fstab, but on every boot, they have different name:
/dev/sdd* becomes /dev/sdb*
/dev/sde* becomes /dev/sdc*
etc. on every boot.
1) Why is this happening?
2) How can I prevent it?
3) If I can't, is there a workaround?
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May 17, 2011
I am setting up a Raid5 and torture testing it. I added two eSata ports to my machine. When a drive is installed in that eSata port and the machine then booted up the device name (e.g. /dev/sdc) is inserted in the middle of my Raid devices. And that is just one example of how the device names can change.I did a search on 'static device names' but I saw nothing directly related to Raid. What I did see were suggestions to create udev rules based on UUID. But that was for single disks, not Raid, where each drive/partition in the raid array appears to have the same UUID.I'm surprised this does not come up in the various Raid howtos because it is impossible to keep a Raid array intact without solving this problem unless the machine is never touched thereafter.
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Oct 25, 2010
I want to get a list of all available Network-Device Names on my Linux server. I figured that
netstat -a
would do the job, however netstat produces quite much output:
eth0 Link encap:Ethernet Hardware Adresse 08:00:27:fc:5c:98
inet Adresse:192.168.2.222 Bcast:192.168.2.255 Maske:255.255.255.0
inet6-Adresse: fe80::a00:27ff:fefc:5c98/64 Gültigkeitsbereich:Verbindung
UP BROADCAST RUNNING MULTICAST MTU:1500 Metrik:1
[Code]....
I assume that this can be done by a combination of "cat", "sed" and "grep", but I have simply no clue of how to strip the uneccessary information.
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Mar 25, 2011
I'm having trouble with Ubuntu 10.10 and stable device names. When I installed Ubuntu, the root drive was the only one in the machine; it obviously got /dev/sda.
After the base installation, I installed three additional 2TB drives to make RAID-5 array. Ubuntu renamed the root drive to /dev/sdd. While annoying I lived with it.
After creating a single partition set to "Linux raid autodetect" on each drive, I created the RAID-5 array:
Code:
All was going well until a reboot. When rebooting Ubuntu decided to make the root drive /dev/sda this time and now mdadm --detail /dev/md0 reports:
Code:
How to fix the array and make the device names stable?
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Dec 1, 2009
I am building a custom RedHat+<our-software> installer iso for our own appliance. I am using Red Hat 5.4. The appliances has two on-board eth interfaces. On the back panel of the appliance, these ports are marked 1 and 2. When I install RH, I find the device names assigned such as eth0/eth1 are arbitrary. I understand this is to be expected with kernels 2.6+. Most of our customers connect their eth cables to the port marked 1 on the back and assume they should configure eth0 to make the device reachable. However, sometimes port 1 gets assigned "eth1". This is not a blocking issue, but its going to confuse our customers and we wanted to make it easier on them.
From reading online discussion boards, I know HOW to switch the assignment of the eth names. However, what I am do not know is whether I need to switch them at all. So I have two questions
1) Is there anyway for me to tell which eth mac corresponds to which port on the back? Since they are soldered on the motherboard and not movable, I would think there would be some way to figure out that x mac address corresponds to the upper port (marked '1' etc).
2) Is there a way to tell this by running a linux command? We need to do this automatically so I need to be able to figure it out at install time from the kickstart post-install or similar.
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Nov 15, 2010
I have a server wich is connected to an iSCSI storage and gets harddisks from this storage. Sometimes I have to add new disks to this server. Everytime I add a disk and make an /etc/init.d/iscsi restart on the server the disks don't have the same device name as before the iscsi restart.
It should be possible to gave the disks persistent names using udev rules. Now I tried to create different rules in "/etc/udev/rules.d/99-static-iscsi-names.rules" e.g.
# /dev/sdc
KERNEL=="sd*", BUS=="scsi", PROGRAM=="/sbin/scsi_id -g -s %p",RESULT=="360a98000503355344c4a576864467877" NAME=="sdc%n"
In "/etc/rc.local" I added "/sbin/start_udev" and in "/etc/scsi_id.config" I added the line "vendor="NETAPP",model="LUN",options=-g"
[Code]...
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Dec 15, 2010
I'm trying to install Xubuntu 10.10 onto a machine with 3 hard drives. My drives are (rather, should be) like this:
/dev/sdaX: Windows and Windows apps/games
/dev/sdbX: Data
/dev/sdcX: Blank drive for Linux.
[code]....
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Feb 20, 2011
This is one of those questions where I highly suspect that the answer will be something like ". . .just stinks bein' you, kid."My setup:I have Ubuntu 10.04 x64 (desktop) installed on a computer with a bunch of SATA ports, including one e-SATA on the backBecause of the way the hardware works with these ports, the *external* port is the first SATA port, a second SATA port inside becomes #2, and a cluster of four ports (that can be made into a (ahem!) RAID array become ports 3 through 6.
All ports are configured as SATA (PATA emulation)My boot drive is located on SATA-2 (the inside connector), a four disk "MD" raid array is located on SATA 3-6, and I have an external HD enclosure that I plug into the e-SATA connection.
With all six drives plugged in, they get ordered like this:
/dev/sda - External drive
/dev/sdb - Internal operating system drive (bootable)
[code]....
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Nov 30, 2010
Is there an easy example of a block device driver I could follow as a guide to write my own module?
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Jun 1, 2010
i my friend has just droped loads of music on to the computer from his ipod but all the names are just codes, when i look at the tag id the information is all there, how can i get the names to change automatically without having to do it all manually. is there a comand that can be put into the termal or a programme
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Apr 16, 2011
Reboot and select proper boot device or insert boot media in selected boot device and press a key. I got this error after: Reducing my Windows 7 partition by about 100gb. Creating a new partition (100gb) and copying my Ubuntu partition (10gb) to the new partition. After it was copied, and pasted, the original partition was deleted. I now had two partitions a new 100gb Ubuntu partition and a 600gb (or so) Windows 7 partition.
All of this was done using a bootable USB with Ubuntu 10.10 and GParted partition editor. Now when I boot I get the "Reboot and select proper boot device or insert boot media in selected boot device and press a key." error.
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Apr 7, 2010
I have an external hard disk drive and I would like it to be recognized with the same name (e.g. /dev/sbd) after each boot.
Is there any way to make that?
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Jun 1, 2010
I want to test LVM+Raid. When I was testing ZFS on Solaris, I was able to create regular files, and use those as disks for testing.I tried creating a regular file full of zeros w/ dd, then partitioning that. fdisk seemed to be able to create a partition on the regular file, but mkfs and parted couldn't work with it. Is there any way to create fake block devices for testing?
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Jun 14, 2010
When I try to mount the /dev/sdd1 device then it give errormount -t ext3 /dev/sdd1 /4hdmount:/dev/sdd1 is not a valid block device
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Apr 25, 2010
I created LVM and formatted it. But at the time of mounting it getting this error message ".....not a block device".
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Oct 16, 2010
How do you go about getting the raw size of a block device under Linux from within a C program? And I mean the raw size of the block device itself, not a file system that may or may not be installed on it. And I'd like to be able to get the raw size of any block device, from hard drives (e.g., /dev/sda) to LVM partitions (/dev/mapper/vg0-home) to loop devices to anything else that is a Linux block device.
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Apr 22, 2010
Is it possible somehow to block some bluetooth device with specif address (mac) ?
(like iptables block by mac)?
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Feb 13, 2009
I'm setting up a machine that's going to be used to test randomly connected tape drives one at a time, and as such, I'm writing the test routine using mt in a bash script, for user-friendliness. The problem is the block device name changes on occasion as tape drives are swapped out and busses are rescanned, so I can't "hard code" a block name into the script.
I know programs like lsscsi and hwinfo will give you block device names as part of their output, but I can't seem to grep anything in such a way as to have the final output be just the block name (ie /dev/st2, or optimally 'st2'), so that I can just have the script read said output, and drop it into the necessary variable.
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Jul 4, 2011
I am trying to debug the issue of a desktop that has for the last two weeks started having kernel panics at boot time. This machine has been running flawlessly for the last 8 years, and has had three OS upgrades. I am using memtest to try to understand the issue. The following is part of the memtest output: Reading all physical volumes Buffer I/O error device hdc logical block 0 Buffer I/O error device hdc logical block 15
Illegal node for this track or incompatible media (asc=0x64 ascq=0x00) The failed "Read 10" packet command was /dev/hdc: read failed after 0 of 4096 at 0 Input/output error and similar set of mesaages After this udev checks correctly, and hardware, storage and audio are initialized However sometime in the middle of the boot process, a kernel panic occurs with message Kernel panic -- not symcing : Fatal exception in interrupt
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Nov 2, 2009
* I am implementing mass storage device on a test board.
* It contains NAND flash.
* Using corresponding "udc driver" and "g_file_storage" I could make my test board enumerate as mass storage device on my Linux machine.
* my 16 MB pen drive (test board) is now ready for read/write.
But there are some Bad Blocks on the NAND.Hence copy is not complete. Although on Linux machine there is no error message. Now , what is there in a normal pen drive which manages the Bad Block or what am I missing so that such Bad Blocks are managed.
Here is the error I get on my test board :
mtdblock: erase of region [0x2c0000, 0x4000] on "Bon 2" failed
end_request: I/O error, dev mtdblock2, sector 5664
Buffer I/O error on device mtdblock2, logical block 708
[code]....
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Mar 15, 2011
I want to keet some data on windows dir. I have tried the below command and giving the below error.
[root@xyz0044 ~]# mount -t cifs //10.48.64.52/jata -o username=domainv.kumar3,password=xxxx /mnt/backup
mount: block device //10.48.64.52/jata is write-protected, mounting read-only
mount: cannot mount block device //10.48.64.52/jata read-only
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Jul 9, 2010
I am running RHEL5.5 its a fresh install and we are testing Xen Virtualization. We are wanting to use our iSCSI SAN for the VMs. I have created the initiator iqn, and discovered the target address. We are connected to the target, but there is no new block device in /dev.
[root@xxxxxxxx etc]# netstat -a | grep iscsi
tcp 0 0 *:iscsi-target *:* LISTEN
tcp 0 0 xxxxx-netapp.okc-:44840 xxxxxx-iscs:iscsi-target ESTABLISHED
tcp 0 0 *:iscsi-target *:* LISTEN
[Code].....
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Nov 1, 2010
I have a write call to a ttyACM serial device that blocks after several hundreds bytes are written.I'm writing in ~25 byte chunks, so I have 5-8 successful writes, then the next write blocks forever.I can bypass the blocked call using select, but I can never call write again without closing and re-opening the port.
The serial port is opened correctly because I can read from it just fine. Write permissions are correct, and it's opened RW.The code is likely correct because I tested the same code using the same device on a pure RS-232 serial port, and it worked fine - no block. Is there anything to know about the linux ACM module?It's my understanding that write calls basically shouldn't block.They're supposed to return -1 if there's an error.
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Mar 5, 2010
I.e. i have Opera open up at the moment and it says "Ubuntu Forums - Post New Thread - Opera". How can i change my programs so that i can change the name of the program that appears in the windows?
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Jan 30, 2011
i have dual boot installation-win7+ ubuntu 10.10 working fine. but the linux partitions are shown as 67gb, 30gb etc , filesystem. what should be done to change the names, and should be changed to what?,for correct identification.-ppm
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May 26, 2009
I am setting up an nfs failover node. The NFS servers share out mounts to a SAN. My problem is this: the master node has
emcpowera as the 100 gig partition
emcpowerb as the 200 gig partition
emcpowerc as the 300 gig partition
and the failover node has
emcpowerc as the 100 gig partition
emcpowerb as the 200 gig partition
emcpowera as the 300 gig partition
This is no problem until the failover node takes over the duties of nfs. The nfs clients that were connected to the share that map to emcpowerc on the master now for some reason map to emcpowera. I had a look and see that powermt is responsible for the pseudo naming of the devices. How do I change the pseudo names for the SAN on the failover node to match the emcpower# (a,b,c) on the Primary node?
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Nov 28, 2009
I have 2 hdds, with encrypted / and /home. Besides there are four other (encrypted ext4) partitions I use rarely. In Fedora 11 at boottime I gave the luks passphrase for / and home and the system booted as intended.
Whenever I needed those extra encrypted partitions I mounted them in Nautilus. Now, in Fedora 12 at boottime dracut tries to open all the encrypted partitions, / and /home are mounted fine, but opening all the other partitions gave the following messages in messages.log:
Quote:
dracut: luksOpen /dev/sdb6 luks-02a0e706-a26f-4019-a2a0-88a0366a994d
kernel: Buffer I/O error on device dm-0, logical block 124
kernel: device-mapper: ioctl: unable to remove open device temporary-cryptsetup-304
kernel: Buffer I/O error on device dm-0, logical block 124
kernel: Buffer I/O error on device dm-0, logical block 124
[code]....
...and these messages are repeated with the other partiitions, and the boot time takes very, very long. How can I tell dracut to ignore those extra encrypted partitions at boottime?
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Jul 15, 2010
I can browse the iso image easily enough with a loopback mount, but when it comes to mounting the actual CD (which I did first), I get:
Code:
$ sudo mount -t udf,iso9660 /dev/dvd /mnt/dvd
mount: block device /dev/dvd is write-protected, mounting read-only
mount: wrong fs type, bad option, bad superblock on /dev/dvd,
missing codepage or other error
In some cases useful info is found in syslog - try
dmesg | tail or so
/var/log/messages isn't very helpful, either:
Code:
Jul 15 15:15:56 bkorb-dt kernel: attempt to access beyond end of device
Jul 15 15:15:56 bkorb-dt kernel: sr0: rw=0, want=68, limit=4
Jul 15 15:15:56 bkorb-dt kernel: isofs_fill_super: bread failed, dev=sr0, iso_blknum=16, block=16
$ md5sum openSUSE-11.3-DVD-x86_64.iso
adf5d2a0a03c1e3aaf102fd6a4771b87 openSUSE-11.3-DVD-x86_64.iso
I burned it with K3B and it gets the same result trying to mount it. K3B seems to know that the image is an iso9660 and is able to display the various 9660 id fields just fine. It just won't mount.
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