Hardware :: Using UUID Or LABEL In Fstab And Menu.1st?
Apr 9, 2010I have a question about mounting partitions. I thought of using UUID or LABEL in fstab and menu.1st Is there an advantage of one over the other?
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General :: Label Versus UUID In Fstab And Menu.lst?
Jan 2, 2010I realized that my understanding of UUIDs in Linux to specifying hard disk partitions may be erroneous.
The proverbial wisdom is that one should not use hard-coded device specifications in fstab and in the boot menu.lst, such as /dev/sda1 etc. The reason normally given is that if hard disk order changes or the order of partitions change, then the entries will be incorrect since they are hardcoded to partitions following a specific order.
So my understanding was that using hard disk labels, in the form of LABEL=xxxx, or UUIDs in the form of UUID=some-uuid, would prevent these problems when disk order or partition order changed.
I decided to avoid the use of LABEL in case I wanted to change the LABEL on a partition to make the names of partitions more easily identifiable. I then thought that UUID was ideal since it never changed for a partition no matter even if I moved that partition to another drive or added another hard drive and thus changes the order of hard drives on my computer. I essentially thought that once UUID was determined for a partition, it never changed but was somehow part of the partition in the hardware of my computer.
Then I became curious of how a UUID was determined. I did this because I often make backups of partitions on external SATA drives and wanted to make sure that somehow the backup would not duplicate whatever Linux considers the UUID of a partition and present a Linux distribution with two UUIDS which are somehow the same and therefore confuse the Linux distribution to the point that I could not use it. I am aware that UUID means a unique id, but I wanted to make sure I understand how that unique id is determined in Linux. This is especially true since the tool I use to make backups of an entire partition is a Windows application, and not a Linux application, and I wanted to make sure that the backup partition UUID would not duplicate that of an existing partition.
In my very brief research in how a UUID is generated under Linux it appears that it is not something that is part of the hardware of the partition itself but rather a number generated by some parameters of the partition, one of which is the partition order.
If it is, it means to me that if I move a partition from one place to another, even on the same hard drive, or to another hard drive, a Linux distribution will no longer find the partition based on the UUID. In that case it seems as if the UUID is subject to the same weakness as the device specification in fstab and menu.lst in that the order of a partition or the placement of a partition on a particular hard drive will cause the designation to no longer refer to the same partition. In which case it appears to me that only the LABEL parameter is not subject to this weakness and as long as I keep distinct labels for all partitions on my hard drive I could theoretically move them around at will and a Linux distribution will find them correctly. I am aware of course that my computer must always find the boot partition to be able to boot a Linux distribution, so moving Linux parttions where I want them is subject to the ability of my computer to find them from the MBR of my hard drives. But in the main it now appears to me that the best way to insure that moving partitions does not keep a Linux distribution from botting correctly is to use LABEL, and not UUID, in fstab and menu.lst, and of course to make sure that if I decide to change the LABEL of a partition that I must change its entry in fstab and possibly menu.lst before rebooting that distribution.
If I have been wrong in my latest surmises I would appreciate being corrected, as the information I found on UUIDs and how they are generated may not be correct. Also if there is more exact information on exactly how partition UUIDs are generated in Linux I would appreciating anyone pointing it out to me.
Debian :: Umounting With LABEL=label In Fstab ?
Jan 31, 2010I'm having trouble umounting partitions.
This is the entry I have in /etc/fstab for backup:
I can mount it ok:
But can't umount it:
General :: Fstab Sdxx Or Uuid Or / Disk And Partitions In The Fstab File?
Jan 5, 2010What would be the best way list disk and partitions in the fstab file?
View 1 Replies View RelatedHardware :: Changes To Fstab (UUID's) / Revert Fstab's Listings Back To The Old /dev/hd Settings?
Jan 15, 2010I've had two hd's in my box forever. for more space and backup reasons. Well I have started running the Debian Squeeze distro since December. I've had many issues, some are still unresolved. but now I'm running into major headaches with the fstab. Specifically dealing with/wondering why UUID's are used instead of the old /dev/hd? I was a little annoyed when I tried Kubuntu to find /dev/sd? used instead of /dev/hd? but that was workable. But the UUID's are a nightmare. Here's my problem.
My main box is finally giving up the ghost. The mobo is dying. So in order to do some tests I took my hd bundle (my two hard drives with their cables) physically out of the box and temp installed them in a test box. I wanted to do some benchmark and other tests. I got all kinds of errors. I found that the system wasn't recognizing the UUID's listed in fstab. My concern is when the new mobo gets here next week I won't simply be able to plug the hd's in like I always have been and just let Linux reconfigure itself (Debian used to be good about this). I really don't want to have to clean reinstall if it's not needed.
So for this I have two questions. WHY developers decided to drop using /dev/hd? or even /dev/sd? ?
And is it possible to revert fstab's listings back to the old /dev/hd? settings. In debian fstab had lines commented out showing how each partition was listed in it's /dev/hd? status during install.
I'm getting really sick of all these archane changes in ALL aspects of linux that don't seem to have any good explaination or need.
Ubuntu :: 10.04 Install - Disabling UUID In Grub2 And Fstab?
Nov 25, 2010For reasons long and unique, I want to disable UUID in my recent Ubuntu 10.4 install, and use the old fashioned /dev/sda1 /dev/sdb3 etc. method. I had this "all fixed" under GRUB (pre-2) on Ubuntu 8.04 and it has served well and bug free for years. (Warning: I use old stable hardware - others may have disasters.) But with GRUB2, the task seems more complicated. (This guide me make the backups I haven't done since the fresh install 2 weeks ago.)
Is the following process complete, necessary, and accurate...
Edit the file /etc/default/grub to remove the # in the line...
#GRUB_DISABLE_LINUX_UUID="true"
... making sure to add the two " if missing .....
Copy nearly the entire /boot/grub/grub.cfg file
into /etc/grub.d/40_custom and then...
Comment out every line that says...
search --no-floppy --fs-uuid --set (etc.)
Change every line that says...
linux /boot/vmlinuz-2.x.yy-zz-generic root=UUID=(etc.) into...
linux /boot/vmlinuz-2.x.yy-zz-generic root=/dev/sda1
Edit /etc/fstab and change every instance of UUID=(etc.)
to the appropriate drive and partition e.g. /dev/sda1
edit /etc/initramfs-tools/conf.d/resume and change RESUME=UUID=(etc.)
into RESUME=/dev/sda1
Run update-grub
Do all the above, every time I do a kernel upgrade. (Is it important to do all the above before or after rebooting for an upgrade?) Am I correct, succinct, and complete in the above process? Any mistakes? Any omissions?
General :: Cameras, Pendrive: Severail UUID Into The /etc/fstab?
Dec 29, 2010Simple. UUID is apparently limited to a single UUID to be defined. Example UUID="DEB0-0001","3338-3164" separated with a comma is not working.
What could be the linux alternatives for pluging several UUID disks? How to bypass when there is a CF card and a reader box, since blkid gives no UUID ?
Code:
UUID="DEB0-0001" /media/pendrive vfat users,rw,noauto,umask=0000,uid=1000,gid=1000 0 0
#UUID="3338-3164" /media/pendrive vfat users,rw,noauto 0 0
#TYPE="vfat" /media/pendrive vfat users,rw,noauto 0 0
OpenSUSE Install :: Pc Not Starting After Change In Fstab Options ( Uuid )?
Jan 31, 2010all of a sudden my pc decided no to start anymore.YOu might be aware of the ide/sata driver problem, well it was the problem. I reinstalled grub with suse dvd and it went ok. Pc working properly. But then i tried to fix this once for all and changed the fstab options from /dev-by-id to uuid (all partitions : swap, /, /home etc ).Is uuid a definite solution ?Why is the pc not able to start from there ?
Since i moved the partitions with uuid option in fstab and even after reinstalling grub the pc is not starting anymore . It gives me the boot menu (linux suse/failsafe) and then a black screen left with no keyboard nor mouse available.
[Code]...
Ubuntu :: Safe To Change Fstab UUID Entry For The System To /dev/sdb4?
Nov 13, 2010is it safe to change fstab UUID entry for the system to /dev/sdb4? and after editing fstab, is there a script or command I need to run to release lock or update mount information? edit: I see not correct, and therefore not safe,but is there a format to tell linux to use /dev/sda1 instead of UUID= or label= .
View 9 Replies View RelatedDebian :: Use Udev Rules To Prevent HDDs To Change Device Instead Of Using UUID In /etc/fstab?
Dec 15, 2010UUIDs make fstab hard to read, so.. Is it possible to use udev rules to prevent HDs to change device, instead of using UUID in /etc/fstab?
View 2 Replies View RelatedUbuntu :: Accessing Drive When Fstab Contains UUID's / No Longer Pertinent To Any Hardware On System
Jul 8, 2011I cloned one of my hard drives to another, using Acronis True Image Home 2011.In the process, of course, fstab got copied verbatim from old to new.I then, using a livecd on a flash drive, mounted the new drive, went into fstab and rewrote the UUID's, using the numbers I'd gotten previously by doing sudo blkid.Now, the new drive had the UUID's revealed by that command.Then, I used boot-repair, from yannubuntu, to make that drive bootable, since it wasn't after the cloning and after the fstab rewrite.The drive is bootable, and it's mountable from a flash drive, or from the old drive.
I can access files either way.the fstab file on the new drive still has the old numbers, yet when I ran boot-repair, it apparently changed the UUID's for sectors 1 and 5 on the new drive.fstab seems to be irrelevant at this point, yet everything I read about it indicates that it is not only relevant, but necessary.I don't understand how I can be accessing the drive when the fstab contains UUID's that are no longer pertinent to any hardware on my system.
Ubuntu Servers :: Mount A USB Drive In Rc.local With /sbin/mount And UUID Instead Of Fstab?
Feb 6, 2010I run a headless Ubuntu 8.04 server, which acts as a web, email and file server. I am sticking with 8.04 as it is a LTS release and will upgrade to the next LTS when it is released.
I have two external USB drives, that I need to mount at boot. I have been using /etc/fstab up until now, with the following entries:
Code:
However, as I gather from doing searches is quite common, occasionally I get an error during boot (causing the system to drop to a recovery shell) because the USB drives take time to wake up and the system hasn't found them by the time it reads /etc/fstab.
From doing searches, it seems there is nothing you can do to fstab to fix this, so you need to mount them using an rc.local script instead, using:
Code:
The problem is, as I have two USB drives, their /dev/sdxx location changes between boots. I thus want to use UUID codes as I do in fstab, however I haven't found anything about this.
Does anyone know how I can use the mount command and UUID to mount a drive in rc.local and what options I have to use the mount the drive with the same options that I am using in my fstab entry? Obvisouly, I can't refer back to fstab using the mount command, because then I will still get the boot error issue if they are listed in fstab. And there is no space internally for the USB drives as there is already two internal drives.
OpenSUSE :: Change The Slab Menu Label?
Oct 13, 2010How i can change the slab menu label? I don't like the label saying 'computer' because doesn't make any sense to me.
View 7 Replies View RelatedUbuntu Servers :: HW RAID Disk Shows Up In Fstab But Not In /dev/disk/by-uuid?
Jun 28, 2010I have an SiI hardware SATA RAID card, with two 500GB disks in mirrored RAID configuration. When I first plugged them in and set it up, things seemed to work ok, but on boot the raid controller told me that the RAID needed rebuilding, and it would happen automatically after POST. So I didn't worry about it, and the drive mounted fine, and it's been that way for years. I just went in and manually on-line rebuilt the RAID in the controller's BIOS, and now when I boot into Ubuntu, both disks show up in fdisk, but neither show up in /dev/disk/by-uuid. Am I missing something?
View 9 Replies View RelatedProgramming :: Get Uuid Value From Variable Block Got From Menu?
Apr 26, 2010I try to get uuid value from variable block got from menu.lst.This try does not work. What is wrong?
Code:
uuid=$( echo $block | awk --re-interval '/(root=UUID=/{ x=gensub(/([0-9a-f-]{36,36})/,"\1","g");
print $1}')
Debian :: Grub Menu - How To Set Default Format To Use UUID
Sep 21, 2010I am using Debian lenny (kernel 2.6.26-2-686).
I changed my menu.lst to use
root=UUID=<long uuid string>
instead of the good old
root=/dev/sd...
I did that because, if I boot with a usb drive attached to my computer, sda become sdb and therefor nothing works anymore since my friend Kernel can't mount it's root partition. BTW, it works wonders using the UUIDs. The story darkens each time there is a kernel update, dist-upgrade resets my menu.lst back using the /dev/sd... format. and BANG... no more booting again. I am good to change my menu.lst back each time.
Ubuntu :: Get Into Menu.lst And Fstab From Live Cd?
Nov 28, 2010It looks like my problems with Error 15 are because I have UUID entries instead of root entries.
How can I access menu.lst and fstab using a live cd so I can edit the entries?
It looks like these files are on sda1.
General :: Difference Between 'LABEL=/1' And 'LABEL=/'
Jun 2, 2010I have to configure "Oracle Ent Linux 5" in different two server.
After installing the server ,I observer that the grub loader entry are different like:
Machine 1:
Machine 2:
Here , I don't understand the difference between 'LABEL=/1' and 'LABEL=/' .
Ubuntu :: Default Boot/grub/menu.lst And Etc/fstab Of HD Install
Aug 29, 2010Due to my script error my boot/grub/menu.lst and etc/fstab files are ruined without being backed up first.
Anyone, the boot/grub/menu.lst and etc/fstab file of Ubuntu 10 LTS installed by default on HD (or whatever).
Ubuntu :: Rename The Fstab-BAK To Fstab?
Jan 19, 2010I've apparently changed my fstab file and now my boot drive fails to mount. The original file is still there "fstab.BAK". How do I rename the current fstab to another name and rename the fstab.BAK to fstab? Since this is read only in the /etc directory I have not been able to make this happen from a command prompt.
View 9 Replies View RelatedFedora :: Edit Label In Grub
Jul 28, 2011I just installed Fedora15 on my Netbook, I find it simply the best OS for this kind of PC. Anyway I have a little problem, Before install Fedora, I installed Windows 7. Now when I start my Netbook, Grub starts countdown, so far so good, then I press any key to enter OS selector where Windows is shown under "other" I would like to know if I can change the label "other" in "Windows7". Also, can I remove the Countdown and make grub starts by let me select which OS I want to start?
View 4 Replies View RelatedUbuntu :: Changed Partition Label, Now Can't Log In?
Apr 10, 2010I may have sabotaged my installation beyond repair, but I am nourishing a cautious optimism, as justified below, and would warmly welcome any ideas.Here's the scoop:The harddrive on my Dell Latitude is divided into a number of partitions; I used to run a Windows-Linux dual boot, so I had some EXT3, some NTFS, and some FAT32 partitions, but a few months ago decided to eliminate the windows, and thus converted the ntfs partition into a linux partition. I've been using this newly converted partition for temporary backups; it held no important data. This, at least, was my supposition: yesterday, I decided to change the label on this partition (cosmetic motives), and after cavalierly making the change with GPARTED, I now can't log in.
A few clues about what could be going on:1. The system boots up fine; when I get to the login screen, however, and enter my name and password, I get the following error message: "GDM could not write to your authorization file. This could mean that you are out of disk space or that your home directory could not be opened for writing. in any case, it is not possible to log in. Please contact your system administrator."2. All my files are intact (following some advice I saw posted on the forums, I hit cnt + alt + F1 and was able to log in) and as far as I can tell, I am not out of disk space. This gives me hope that maybe I can restore the system without totally reinstalling Ubuntu.That is about all I know. If anyone has any thoughts as to what might be going on, I would be very happy to hear them.
Ubuntu :: Black Label Under Docky?
Oct 17, 2010i see a big black label under the docky dock... i tried to activate maincity compositing but it's still there..
View 4 Replies View RelatedUbuntu :: FAT32 Label Is Always Caps?
Nov 28, 2010Yeah, I've been messing around with my partitions recently to make them more organized and appealing to my OCD file management habits. My main partition that I use to store all my files and windows programs on was previously labeled "Free" since I installed Ubuntu a few weeks ago and created separate partitions for things, I didn't like the vagueness of the name, so I changed it to "Storage" via GParted Partition Editor.
Yet, for some reason it always changes its self to all capital letters. I label it "Storage", it becomes "STORAGE". I've researched around for others who have similar issues, but they usually ended up with a response similar to "It's Fat32, so it's always capital." I don't see how that's true, considering mine was labeled "Free" for the longest time..
General :: Label And Format USB Drive?
Jun 16, 2010I have a USB thumb drive that I just partitioned using the 'fdisk' utility in Linux. Now I am trying to learn the command that will allow me to format the drive as 'fat32' while also setting the disk label on the device as "ocz_usb" when the drive gets mounted. Does anyone know the command I would use that will format the USB drive and properly set the disk label at the same time?
View 3 Replies View RelatedGeneral :: Creating New Partition And Label ?
Mar 11, 2010I am a newbie to Linux and I am using CentOs. I am trying to create a new partion on my CentOs VM. I create a new primary partition using fdisk (I use the command fdisk /dev/hda). After I create the partition and use partprobe to write the partition to disk, I try to give the new partition a label. So, I use the command e2label /dev/hda LABEL=test
However, when I enter the command e2label /dev/hda3 , it doesn't display the label for the newly created partition. Am I doing something wrong here? Is the syntax of the e2label command wrong when creating the label for the new partition? Did I miss a step after writing the new partition to disk.
General :: Mlabel Command - Can't Re-label
Aug 24, 2010i was trying to re-label my flash drive and i manged to with the help of this command
mlabel -i /dev/sdc1 -s ::test
what does the -i option means cause after i read the manual pages i couldn't find it there. mlabel only takes the "v" "s" "c" switches and no "i" and when I remove the -i option from the whole command don;t work and i can't re-label. its just driving me crazy that every one is using it and no tells what does it do.
General :: Rename Partition Label ?
Mar 7, 2011I just installed Linux on a second partition. The label of this partition is currently " newlabel " i want to change this to "linux" how to do this.
View 2 Replies View RelatedSoftware :: Set Partition Label Using Cfdisk?
May 8, 2011Is it possible to set partition label using cfdisk?
View 3 Replies View RelatedFedora :: Rename Disk Label On Desktop?
Oct 13, 2009I have a 21GB mounted partition /media/mydata. On my desktop it's labelled as "21 GB Filesystem". When I open it with Nautilus it's called "mydata". Is there a way of changing that label to "mydata" on the desktop?
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