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Questions tagged [uuid]

The tag has no usage guidance.

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3answers
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Drive won't boot from its Grub, but will from another drive's Grub, after cloning, why?

It was a month ago, so if you ask me on details, I might still remember, but better act on information that can be given as of now. Due to the lack of time, I did not ask for help here. I have cloned ...
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1answer
10 views

What are the use cases for a hard disk's WWN?

I noticed today while setting up a new system that the disk as represented by /dev/disk/by-id also had a WWN link that I was not familiar with: My research suggests that this is a "World Wide Number" ...
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1answer
122 views

How do I create a zpool using uuid or truly unique identifier?

I created my first zpool the other day, assigning by drive letter, and found that when I rebooted it was degraded. Upon closer inspection, I realized that my drive letters had changed with reboot, so ...
0
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1answer
28 views

Add PARTUUID to DOS MBR

I have an MBR style formatted SD card where I need a PARTUUID in order to mount a partition there as the rootfs (via linux kernel parameter root=PARTUUID=...). Using an fs UUID does not work. ...
1
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1answer
32 views

UUID of fs - where are they stored?

Recently I tried to install Ubuntu Studio 18 and upon restart was given GRUB prompt, not Linux graphic login. Surprised, I started to investigate and found that grub.cfg file in ESP partition contains ...
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1answer
124 views

How to change UUID after cloning a Mac HDD with `dd`?

After 1 day of googling and try&error I give up and ask for help. Long story short: I cloned internal HDD of my iMac (Mid 2011) to external SDD with dd command. Now I have two identical discs ...
0
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1answer
56 views

what is the advantage to configure the network ETH with UUID?

what is the advantage to configure the network with UUID? uuidgen eno093736 1b64d026-c6a6-447c-85aa-40c5d2db2c4e for example we want to configure BOND under /etc/sysconfig/network-script what is ...
4
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3answers
147 views

Store a custom serial number on a USB flash drive, immune to overwriting

I'm working with massive amounts of USB flash memory. I'd like to be able to track events regarding the USB drives. Specifically: I perform f3 tests, format the drives and write data to them. I'm ...
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0answers
193 views

Can't run 'update-grub'

I've got some trouble with my Ubuntu-System: update-grub Generating grub configuration file ... grub-probe: error: disk `mduuid/c7ac5a8fef833db7b45d6c2ebb2e20e6,1' not found. But I'm still able to ...
1
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2answers
790 views

how to perform xfs_repair on disk that is actually UUID

we have redhat machines version 6.x we want to fix the file-system on one of our disks UUID=198s5364-a29c-429e-b16d-e772acd /data_SA xfs rw,noatime,inode64,allocsize=16m 1 2 but ...
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1answer
46 views

When trying to mount my UUID can't be found, how can I find

Hello I'm new to all this so please bare with me. I'm in the works of building a lighting node, and run the command [sudo mount -a] I get this error saying my UUID I can't be found. Can someone ...
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1answer
89 views

UUID's when changing hardware

My question is this... In /etc/sysconfig/network-scripts/ifcfg-eno1 there is a UUID to identify the on-board network interface. I also notice now that some partitions in fstab are also identified by ...
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0answers
101 views

Where are network connection UUIDs stored in Fedora 27?

Even if I stop NetworkManager and delete all files I can find concerning the network interface or the current UUID of that interface (ifcfg-* and leases) and then reboot, the UUID that appears in "...
2
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1answer
583 views

Why use UUIDs in /etc/fstab instead of device names? [duplicate]

What is the reasoning behind using UUIDs in /etc/fstab instead of device names (like /dev/sbd2)? Device names &/or partition numbers seem substantially cleaner from an administrative viewpoint.
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1answer
174 views

debian stretch UUID package

I am running Debian 9.3 (Stretch). I am trying to install some tools from Vmware and it asks for a package UUID 0.03 or newer. How can I upgrade UUID to newer version? It does not proceed any further ...
0
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1answer
486 views

Slackware64 14.2 - GRUB2 - How set default <UUID> instead <DEVICE>?

i am trying the grub configuration file "/boot/grub/grub.cfg" in the kernel line, set "root=UUID=" instead "root=/dev/" for example when i ran : grub-mkconfig -o /boot/grub/grub.cfg the file /boot/...
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0answers
37 views

Migrating Linux to new system

I read a couple posts about migrating Linux from one PC to another PC and my understanding is that Linux will just move and work without issue. Based on my changes this should be true. I am waiting ...
0
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1answer
84 views

is it possible to capture the UUID number before creating file system on disk

is it possible to capture the UUID number before creating file system on disk? if yes how - by which command ? blkid ( before run mkfs.ext4 on sdb disk ) <no output> blkid ( after run mkfs....
1
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1answer
75 views

how to identify UUID conf or ordinary dev conf from fstab

we need to add disks on more then 100 redhat machines, therefore we need to update also the /etc/fstab on each machine the problem is that some machines configured with UUID and other with ordinary ...
2
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2answers
492 views

UUID in fstab + in which cases we must not configured UUID in fstab

discussion - we have redhat linux machines and my question is about the UUID configuration in /etc/fstab file , and in which cases UUID risk the OS as I understand we MUST NOT use UUID in /etc/...
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0answers
120 views

After a reboot the UUID has changed for my gluster bricks. How do I know which uuid goes to which brick

After our storage rebooted blkid now has different UUIDs listed compared to what is in /etc/fstab. I have 8 gluster bricks that are mounted in fstab but I can't verify which brick is now associated ...
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3answers
90 views

in which cases it will be problematic to configure UUID in fstab

We are thinking about to change all Linux fstab configuration to work with UUID instead the current configuration Some of the disks are with non RAID and some of the disks are with RAID10 I searched ...
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0answers
69 views

Strange mdadm raid1 uuid behavior [duplicate]

Command: # mdadm --detail /dev/md0, UUID: UUID : 75ef0eb7:26381ba8:a00e8abd:98c0de06 Command: # ls -lh /dev/disk/by-uuid/, UUID: c016314e-55fc-4a03-b3d2-4d2862cce7cc -> ../../md0 Why are UUIDs ...
1
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3answers
918 views

Why does systemd wait for a disk not present in `fstab`?

My system takes exactly 95 seconds to boot: 5 seconds actual boot and 90 seconds waiting for a nonexistent drive: (...boot.log...) A start job is running for dev-disk-by\x2duuid-6bbb4ed8\x2d53ea\...
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0answers
511 views

Bluetooth controller vs device UUID handle mismatch affecting pairing?

I've been Googling for 2 days and cannot find a fix that works for me. I'm running into a wall trying to pair a Bluetooth mouse. I think my issue is related to a mismatch between the UUID handles ...
2
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0answers
1k views

How to properly mount other partitions (NTFS) on my Fedora FSH?

I recently switched to Fedora 27 Beta (UEFI install, dual-boot with Win 10), and I changed my /etc/fstab to include the two following lines: UUID=D0E24ECDE24EB78C /media/DownloadsBin ntfs-3g auto,...
1
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2answers
3k views

Is machine-id a uuid?

I searched my question and none of them answered me: Is machine-id as unique as mainboard UUID (fetched by "get csproduct UUID" command on windows)? And is enough reliable to bind a license on machine-...
0
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1answer
3k views

How to update fstab file with UUID?

The following lines are defined in my /etc/fstab file. My current fstab: /dev/sdb /lpo/sda ext4 defaults,noatime 0 0 /dev/sdc /lpo/sdb ext4 defaults,noatime 0 0 From blkid we get: /dev/sdb: UUID="...
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2answers
516 views

Linux on external USB drive won't boot on other computers

I have GNU/Linux (currently Fedora 26, but previously Linux Mint 18.2 Sonya) installed on an external hard drive alongside an NTFS partition I use for storage – and it boots perfectly on the computer ...
1
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1answer
180 views

mdadm.conf: devices by UUID, re-plug-in to another cable for example

Server: Dell T20 with additional SATA PCI-E controller, 5 SATA drives plugged in at the moment. All GPT partitioned. System: GNU/Linux Debian 9 Stretch. Situation: I often change HDD configuration ...
3
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1answer
758 views

sda and sdb keep on swapping

The box is a HP microserver, running Ubuntu 16.04. I recently "upgraded" the boot device to a 64GB SSD. Additionally there is a 1TB SATA drive. usually it boots up with /dev/sda1 as the primary ...
1
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1answer
269 views

Force disk onto /dev/sdX

I'm trying to ddrescue (through rescueCD) a drive, which keeps spinning down. e.g ddrescue -N -n -A -M -f /dev/sdk /dev/sdd mapfile Without rebooting I can get the drive for a short while through ...
0
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1answer
108 views

blkid returns more information than expected

I'm following a recipe I created a couple of years ago, where at one point I need to use blkid to obtain a filesystem UUID. I have this command noted, along with an expected example return value: ...
1
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1answer
155 views

Can someone explain this weird ps behavior?

Two issues: pf -fU <user> not showing particular user processes while ps -ef | grep <user> or ps aux can. pstree -p <pid>, where pid is that particular process I mentioned above, ...
1
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1answer
908 views

What command always generates the same UUID through /proc/sys/kernel

Running the following command generates different random output on each execution (which is expected, considering that random is in the path): cat /proc/sys/kernel/random/uuid Is there any way to ...
0
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1answer
69 views

Does Grub2 have a way of uniquely labelling the menu entries that can be used to set the default for booting?

Does grub2 have a means of selecting a menu entry by a unique label instead of the current numbering system which results in commands like grub-reboot '1>3', GRUB_DEFAULT="1", GRUB_DEFAULT="1>3"?...
2
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1answer
1k views

“Gave up waiting for root device” with one kernel but not another

I have a Linux system with kernels 3.10.17 and 4.8.4 installed, but only the older kernel can boot. Trying the newer one, "Gave up waiting for root device" occurs along with a bunch of "modprobe: Can'...
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2answers
3k views

Extract UUID value from JSON returned from HTTP reply

I am trying to make a little script in shellscript that takes one serviceUuid from a response and use it. I just print the server response on a file called final.txt Now i need to extract the value ...
0
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1answer
129 views

What are kernel UUIDs? Why would they be crazy sh!t?

I've watched DebConf 14: QA with Linus Torvalds, and at about 19:50 Linux mentions how "UUIDs are crazy sh!t." What are UUIDs used for (at the kernel level)? What does Linus mean by this?
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0answers
37 views

mdadm Raid 1 OS array dissappeared, UUID's all zeros

A little backstory because I'm not sure what's relevant... I set up a file server at a school here in West Africa where they teach computer classes, ESL, and a few other things. Though it's used ...
0
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1answer
231 views

Only half of my drives assemble during a RAID recovery

I have an 8 drive RAID I am trying to recover. The assemble only found 4 of the 8 drives. Why are the other drives not found? me@mjf-svr:~$ cat /proc/mdstat Personalities : [raid6] [raid5] [raid4] ...
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1answer
64 views

Cannot boot up when Adaptec SCSI card is replaced

Current Fedora 19 installation is on an Adaptec 29320 and I am trying to temporarily replace it with an Adaptec 29160. The functionality of the cards is very nearly the same except the replacement is ...
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2answers
5k views

How to identify root partition via UUID without initramfs/initrd

Without initramfs/initrd support, the following kernel command line won't work: linux /bzImage root=UUID=666c2eee-193d-42db-a490-4c444342bd4e ro How can I identify my root partition via UUID ...
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1answer
2k views

fstab entry for swap space

Here is the free -m output [prem@myserver: /home/prem]$ free -m total used free shared buff/cache available Mem: 991 218 85 267 ...
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0answers
103 views

Are there technical limitations preventing root=UUID=<filesystem-uuid> support? [closed]

There is no code in kernel-source/init/do_mounts.c for mounting a filesystem by its UUID, however there is code for mounting a filesystem by that filesystem's partition's UUID. Are there any ...
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1answer
100 views

How do I add /home to arch with uuid if I messed up while installing?

I installed arch Linux but I forgot to make my desired home partition. /home. I accidentally forgot to change the partition from Linux filesystem to add /home. I changed the partition to /home after ...
2
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1answer
1k views

Understanding UUID assignment

A UUID (universal unique identifier) is a 128 bit code which is used to identify block (storage) devices. Firstly, is this all UUIDs are used for? How does a device obtain its UUID? Does it ever ...
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1answer
613 views

Missing partition / drive Centos 7

I was trying to change permissions on one of my NTFS partitions and I think I have messed something up. I entered the below command on Centos 7 and now the partition is missing from the File Manager. ...
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2answers
5k views

How do I get the UUID of a partition and define a Bash variable as being equal to it?

I would like to define a Bash variable PART_ID as being equal to the UUID of the /dev/sdb1 partition. The closest I have gotten to the desired answer is the output of: ls -ld /dev/disk/by-uuid/* | ...
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2answers
2k views

change FAT16 partition UUID

I have created a FAT16 formatted partition on my USB stick using mkdosfs /dev/sdb1 when I plug in my stick, it appears in /dev/ as: /dev/disk/by-uuid/ABCD-1234 How can I change the UUID of the ...