Category: Fstab partuuid or uuid

Ask Ubuntu is a question and answer site for Ubuntu users and developers. It only takes a minute to sign up. I'm trying to setup my external harddrive to mount automatically on startup, following Akshit's terminal guide. This gave me an error when I ran findmnt --verify --verbose at which point I rechecked blkid and noticed that I'd been using the partition ID:.

As far as I know, collisions will not happen within the lifetime of the universe". In your case it doesn't really matter.

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Actual UUIDs are supposed to be bit long and meant to be unique. Prior to this, various systems provided various serial numbers of various size to be distinguishable. Even when I'm creating an encrypted swap partition. As you might know fstab stands for File System Table. Use UUID and no surprises unless you have to use other methods for specific reasons.

Here are some quotes from the answer:. If you decide to use the partition for something else format itit'll still be identified even though the content is no longer there, and it might get mounted to the wrong place. UUID identifies a filesystem by content. If the UUID is found, the filesystem is there.

fstab partuuid or uuid

And it doesn't matter if it's a whole block device, partition, raid, luks or lvm. In general fstab entries are about mounting specific content to specific locations so identifying by content rather than by partition is more natural. It's a lot more common to use UUIDs. The downside of UUIDs is that you have to scan all devices for content to find them. After all the UUID could be anywhere. But you'd need a ton of block devices for that to make a difference. Both UUID and PARTUUID are intended to be unique identifiers, one related to the file system, so changing when you reformat the partition, the other to the partition, so associated with the partition itself won't change when you reformat.

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Is it better to use the one over the other? It does not matter too much. When you mount a drive yourself in fstabyou need to be well aware what you mount, and at that level it does not matter much whether you use one or another unique identifier.

Ubuntu Community Ask! Sign up to join this community. The best answers are voted up and rise to the top. Ask Question. Asked 5 months ago. Active 5 months ago. Viewed times. Improve this question. Sebr Sebr 57 4 4 bronze badges. Active Oldest Votes. This gave me an error when I ran findmnt --verify --verbose It has been already mentioned in the other answer. Improve this answer.It only takes a minute to sign up. What do they mean? It can only be read if the filesystem type is known and readable.

Since it is retrieved from the partition table, it is accessible without making any assumptions at all about the actual contents of the partition. If the partition is encrypted using some unknown encryption method, this might be the only accessible unique identifier for that particular partition.

It is the equivalent of the disk signature on MBR-partitioned disks but with more bits and a standardized procedure for its generation. Sign up to join this community. The best answers are voted up and rise to the top. Ask Question. Asked 3 years, 7 months ago. Active 8 months ago. Viewed 12k times. Improve this question. UUID identifies a filesystem. Active Oldest Votes. Improve this answer. If you use a different distribution, check the man page on your system to verify.

The string representation of the UUID should be based on lower case characters. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown.

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fstab partuuid or uuid

Visual design changes to the review queues. Linked 0. Related 3. Hot Network Questions. Question feed.Joinsubscribers and get a daily digest of news, geek trivia, and our feature articles. By submitting your email, you agree to the Terms of Use and Privacy Policy. Adding a new hard drive or solid-state drive to your Linux computer?

A lot of people find the very idea scary. We step you through the process of editing your fstab file to integrate your new drive into your file system. You connect up the hardware, power on the computer, and log in to the operating system.

How to add UUID entry in /etc/fstab in Linux

But you cannot see your new drive anywhere. Or even give you a hint that it has found your new hardware. There are two parts to the process. The first part is doing some reconnaissance to identify the hard drive and to gather some information on it. We need to know that Linux can see them, and what block devices Linux is using for them.

In Linux and Unix-like operating systems, a block device is a special file that acts as an interface to a device that data can be read from and written to unless it is read-only. Block devices often represent a mass-storage unit of some kind for example, a partition on a hard disk or a CD-ROM.

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We can use the lsblk command to list the block devices connected to your Linux computer. In the screenshot above, you can see that the loop devices are all given a major number of 7 meaning a loopback, or loop, deviceand the minor numbers simply increment by 1 each time.

A squashfs file system is created each time an application is installed using the snappy package management system.

The minor numbers for the first drive, sdarun from 0 to The 0 represents the physical drive, and the minor number of 1 represents the first partition on that drive. For the second drive, sdbthe minor numbers run from 16 to The kernel documentation contains a long listing of all values that the major and minor numbers can take. On our test machine, we see:. So, we have three SCSI drives. The other two are not mounted at all, which is to be expected for brand new drives.

Actually, as this is a virtual computer, these are also virtual disks. Its major number is You can use fdisk to create a partition if required. We get an extra column on the right of the display, which is the ROTA rotating column.

That makes sense because an SSD is a non-rotating storage device. Mounting the SSD is just as simple. We tell mount which partition on which device to mount, and the mount point to mount it on. All seems well. Now we need to configure the fstab file so that these devices are mounted each time the computer is started up. The fstab file contains an entry for each file system that is mounted when your computer is restarted.

Each entry is made up of six fields. The fields are:. These fields must be specified in this order, and they must have a space or a tab between them. The man page for each file system will list the options that can be used. Here are some of the more common options:.Persistent naming allows you not to worry about this at all. Again, if you have persistent naming in place, you won't even notice.

The postinst for the package linux-base includes code to assist with the changeover, but it makes sense to get it sorted out and verified as working in advance. There are more reasons, but these are the most critical ones now and in the near future.

That's why Debian encourages you to change your setup to persistent naming schemes, unless you are using LVM. The point of the digit base strings is to make collisions astronomically unlikely; if it happened that sda1 and sda2 had the same UUID the system would fail to boot.

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Via Labels Almost every filesystem type can also have a label. LVM snapshots will also result in duplicate labels. These are intended to be immutable for a given hardware configuration. Both contain strings to indicate which subsystem they belong to and thus are not suitable for solving the problems mentioned in the beginning of this article. They won't be discussed any further here. However, swap partitions can be given persistent names via mkswap.

Maybe rather with udev? Wiki Login. Hosting provided by Metropolitan Area Network Darmstadt.Raspberry Pi Stack Exchange is a question and answer site for users and developers of hardware and software for Raspberry Pi. It only takes a minute to sign up. I've followed the procedure in the raspberry pi forums to make my Raspberry Pi 3 use an USB key instead of the SD card as root filesystem in the hope to make it more robust to power loss.

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What's the purpose of both? A UUID is guaranteed to be unique.

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As far as I know, collisions will not happen within the lifetime of the universe. A UUID is simply a unique identifier. They are used for many different purposes. You can generate them using the uuidgen function. A new UUID is generated for each new partition. So, if re-partition a given drive, all the blkid UUIDs for that drive will change. Part of the reason UUIDs are used as identifiers of partitions and drives is to maintain identifiers even when drives are added or mounted in a different order.

This had the disadvantage of possibly having sda1 be a physically different drive or partition if somehow the mount order was changed. For further reading see Linux. Linux UUIDs are a function of filesystems, and are created when the filesystem is created.

You won't see this with current releases of gdisk, because until there were no Linux filesystem GUIDs. In the specific case of mounting filesystems on linux "UUID" reffers to a unique identifier that is part of the metadata stored inside the filesystem. Sign up to join this community. The best answers are voted up and rise to the top. Ask Question. Asked 3 years, 2 months ago. Active 1 year, 8 months ago. Viewed 41k times.

Improve this question. AProgrammer AProgrammer 1 1 gold badge 2 2 silver badges 5 5 bronze badges. Hi AProgrammer, and welcome to the Raspberry Pi stack exchange. I think you should consider that this isn't a question about Raspberry Pi! More people would see this question both to answer it and to benefit from answers offered if it were in, perhaps, the main Linux forum.

TaiViinikka, I admit having hesitated between this and unix.

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That's quite understandable and I'm glad you got an answer. Active Oldest Votes. Improve this answer. RubberStamp RubberStamp 1, 1 1 gold badge 7 7 silver badges 16 16 bronze badges. The mystery deepen. AProgrammer: Added some information to my answer. I have two partitions on two different disks with the same UUID. So much for " lifetime of the universe " As I understand it.Hi, I want ask you for advice.

In arch installation wiki is recommended use UUID when is generated fstab :. I want change this, because when goes something wrong with my system, I can easly format root partition and run rsync from my backup. From what I understand which isn't much there would be effectively no real difference.

That will stay static unless you repartition your drive. But if you swap out a drive from another machine, you could potentially run into naming conflicts. If you decide to use the partition for something else format itit'll still be identified even though the content is no longer there, and it might get mounted to the wrong place.

Or the other way around, if your partition table had an issue, and you end up re-creating the same partitions with different partuuidsit'll no longer be identified even though the content is still there. UUID identifies a filesystem by content. If the UUID is found, the filesystem is there. And it doesn't matter if it's a whole block device, partition, raid, luks or lvm. In general fstab entries are about mounting specific content to specific locations so identifying by content rather than by partition is more natural.

It's a lot more common to use UUIDs. The downside of UUIDs is that you have to scan all devices for content to find them. After all the UUID could be anywhere. But you'd need a ton of block devices for that to make a difference. But at the end of the day, either one might work so it's a matter of taste. And there are special applications where UUIDs just don't work, for example if you want to mount an USB stick plugged into a specific USB port to a specific location, no matter which stick is plugged you need by-path instead of any kind of uuid.

Most mkfs. You can create a new file system and with the old UUID. Atom topic feed. Arch Linux. Index Rules Search Register Login. You are not logged in. Topics: Active Unanswered. Pages: 1. StopkaPeter wrote: I want change this, because when goes something wrong with my system, I can easly format root partition and run rsync from my backup.

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fstab partuuid or uuid

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