Category archives: Resize2fs

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It only takes a minute to sign up. However, when I perform lvextendI see that the changes are already applied to the partition as shown in Gnome Disks. So why do I still need to do resize2fs? The lvextend command without the --resizefs option only makes the LVM-side arrangements to enlarge the block device that is the logical volume.

No matter what the filesystem type or even whether or not there is a filesystem at all on the LV, these operations are always similar. Other filesystems may have their own extension tools. And if the logical volume did not contain a filesystem but instead something like a "raw" database or an Oracle ASM volume, a yet another procedure would need to be applied.

Each filesystem has different internal workings and so the conditions for extending a filesystem will be different for each. It took a while until a common API was designed for filesystem extension; that made it possible to implement the fsadm resize command, which provides an unified syntax for extending several filesystem types.

The --resizefs option of lvextend just uses the fsadm resize command. In a nutshell: After lvextendLVM-level tools such as lvsvgslvdisplay and vgdisplay will see the updated size, but the filesystem and any tools operating on it, like dfwon't see it yet. The LVM layer is just a container for the filesystem within. You can tell lvextend to resize the filesystem within the logical volume without having to run a separate resize2fs adding the -r or --resizefs option:. Because filesystems and logical volumes are different abstractions.

6.3. Resizing an Ext4 File System

A volume is a chunk of disk like a partition — or at least, the "virtual" equivalent. It's just a block device. A filesystem is a structure that goes inside of that or, on top of it, if you prefer and which is used to provide a mapping between files and directories and so on to that device. Without resize2fsthe partition is bigger, but the filesystem isn't taking advantage of the available space.

You can actually create a filesystem initially which does not take up the entire partition. From the mke2fs man page:. The file system size is specified by fs-size. If fs-size does not have a suffix, it is interpreted as power-of-two kilobytes, unless the -b blocksize option is specified, in which case fs-size is interpreted as the number of blocksize blocks.

If the fs-size is suffixed by 'k', 'm', 'g', 't' either upper-case or lower-casethen it is interpreted in power-of-two kilobytes, megabytes, gigabytes, terabytes, etc.


If fs-size is omitted, mke2fs will create the file system based on the device size. As you can see, the default is to fill the partition, and there's usually no reason to do otherwise — but you can if you want. Note that when lvextend has an option --resizefs or just -r which takes care of growing the filesystem after the volume has been extended without needing to run a separate command.

The resize2fs forces the fsfilesystem to expand or shrink to take up the new space produced by the lvextend command. The processes:. Sign up to join this community.

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The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Why do I need to do resize2fs after lvextend?


Ask Question. Asked 2 years, 3 months ago. Active 2 years, 3 months ago. Viewed 18k times. Rufus Rufus 1 1 gold badge 2 2 silver badges 8 8 bronze badges. Active Oldest Votes. Would it be right to say that after running lvextend and prior to running resize2fsdf would NOT report the updated sizes?If the partition the file system is on is currently mounted, unmount it.

For example.


Accepted size units for file system block sizes are: S - byte sectors K - kilobytes M - megabytes G - gigabytes. We found the resize2fs command in step 3 did not work unless we added the -f option to the e2fsck command in step 2.

Prerequisits A created partition that you know the name of. The first field is the name of the partition. A created file system.

How to Grow an ext2/3/4 File System with resize2fs

Run fsck on the unmounted file system. Accepted size units for file system block sizes are: S - byte sectors K - kilobytes M - megabytes G - gigabytes 4. Mount the file system and partition. Log in to comment. MB Community Member 33 points. Michael Bohler. Here are the common uses of Markdown. Learn more Close. Are you sure you want to request a translation? We appreciate your interest in having Red Hat content localized to your language.

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Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I have tried adding a new partition using fdisk and using vgextend to extend the volume group, then resizing. Resize worked fine for the logical volume using lvextend, but it failed at resize2fs. I have also tried deleting an existing partition using fdisk and recreating it with a larger end block, then resizing the physical volume using lvm pvresize, followed by a resize of the logical volume using lvm lvresize.

Again everything worked fine up to this point. After a bit of trial and error Hope this helps. On Centos 7, in answer to the original question where resize2fs fails with "bad magic number" try using fsadm as follows:. Please confirm the file system of your instance using below command. Please follow the procedure to expand volume by following the steps mentioned in Amazon official document for different file systems. Default file system in Centos is xfs, use the following command for xfs file system to increase partition size.

Learn more. Asked 5 years, 6 months ago. Active 18 days ago. Viewed k times. I am trying to resize a logical volume on CentOS7 but am running into the following error: resize2fs 1. Once I tried to use resize2fs, using both methods as above, I received the exact same error. Hopefully some of the following will shed some light. ChrisKnowles ChrisKnowles 4, 3 3 gold badges 10 10 silver badges 11 11 bronze badges. Active Oldest Votes.If you've got a moment, please tell us what we did right so we can do more of it.

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How To Extend LVM Disk For Linux Virtual Machine On VMware

If you've got a moment, please tell us how we can make the documentation better. After you increase the size of an EBS volume, you must use file system—specific commands to extend the file system to the larger size. You can resize the file system as soon as the volume enters the optimizing state.

Before extending a file system that contains valuable data, it is best practice to create a snapshot of the volume, in case you need to roll back your changes. To verify the file system in use for each volume on your instance, connect to your instance and run the file -s command.

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The following example shows a Nitro-based instance that has a boot volume with an XFS file system and an additional volume with an XFS file system. The following example shows a T2 instance that has a boot volume with an ext4 file system and an additional volume with an XFS file system. Your EBS volume might have a partition that contains the file system and data. Increasing the size of a volume does not increase the size of the partition. Before you extend the file system on a resized volume, check whether the volume has a partition that must be extended to the new size of the volume.

Use the lsblk command to display information about the block devices attached to your instance. If a resized volume has a partition and the partition does not reflect the new size of the volume, use the growpart command to extend the partition. For information about extending an LVM partition, see Extending a logical volume. While the size of the root volume reflects the new size, 16 GB, the size of the partition reflects the original size, 8 GB, and must be extended before you can extend the file system.

The size of the volume reflects the new size, 30 GB. To extend the partition on the root volume, use the following growpart command. Notice that there is a space between the device name and the partition number. You can verify that the partition reflects the increased volume size by using the lsblk command again.

While the size of the volume is 16 GB, the size of the partition is still 8 GB and must be extended.The partition was successfully extended, as we can see all of the data survived!

Reviewing the current disk configuration: Geekpeek mount point is the partition we want to reduce. We can see that the partition has MB of available space and MB is used by dummy data.

We want to reduce the partition to MB without loosing data:. The partition was successfully reduced to MB, as we can see all of the data survived! Hi Mitch, Nice comprehensive, precise guide for onine-resizing! This is exactly what i was searching for. Have your site bookmarked now. Do you have a tipp for a good start into linux server administration perhaps?

Hi Dan!

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It all depends what you want from it. To work with linux professionally red hat classess and certifications are the best. You learn everything from fundamentals up and it is really intense! As far as distributions go, i prefer red hat and centos over ubuntu. It is in the end your choice to make. Regards, Mitch. Hello Mtch: Thanks so much for the tutorial. The superblock could not be read or does not describe a correct ext2 filesystem.

Do you have any idea of what may be wrong? This guide is simple and awesome. I must admit that deleting the partition with fdisk is really scary, but this worked perfectly. I want to extend my linux lvm root partition…how can i extend it, i have installed fedora 19 on it and while upgrading to fedora 20 the root partition get out of space…now how it solve…plz reply me?

Hi CyberExpert. I will write a how to about this soon — i see there is a lot of interest in it. Regards, Mitja. Thanks for your response, Mitch …. Thank you so much for this tutorial. My sda1 starts from 1 — 32, sda2 starts from 32 — The resize2fs program will resize ext2, ext3, or ext4 file systems. It can be used to enlarge or shrink an unmounted file system located on device.

If the filesystem is mounted, it can be used to expand the size of the mounted filesystem, assuming the kernel supports on-line resizing. As of this writing, the Linux 2. The size parameter specifies the requested new size of the filesystem. If no units are specified, the units of the size parameter shall be the filesystem blocksize of the filesystem. The size of the filesystem may never be larger than the size of the partition.

If size parameter is not specified, it will default to the size of the partition. Note: when kilobytes is used above, I mean realpower-of-2 kilobytes, i.

The resize2fs program does not manipulate the size of partitions. If you wish to enlarge a filesystem, you must make sure you can expand the size of the underlying partition first. When recreating the partition, make sure you create it with the same starting disk cylinder as before!

Otherwise, the resize operation will certainly not work, and you may lose your entire filesystem. After running fdisk 8run resize2fs to resize the ext2 filesystem to use all of the space in the newly enlarged partition. If you wish to shrink an ext2 partition, first use resize2fs to shrink the size of filesystem. Then you may use fdisk 8 to shrink the size of the partition. When shrinking the size of the partition, make sure you do not make it smaller than the new size of the ext2 filesystem!

Turns on various resize2fs debugging features, if they have been compiled into the binary. Forces resize2fs to proceed with the filesystem resize operation, overriding some safety checks which resize2fs normally enforces. Only really useful for doing resize2fs time trials.

Prints out a percentage completion bars for each resize2fs operation during an offline resize, so that the user can keep track of what the program is doing. The resize2fs program will heuristically determine the RAID stride that was specified when the filesystem was created. This option allows the user to explicitly specify a RAID stride setting to be used by resize2fs instead.

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The minimum size of the filesystem as estimated by resize2fs may be incorrect, especially for filesystems with 1k and 2k blocksizes. Thanks for this example! Feel free to post other examples Oops! There is a tiny cockup. A damn cockup. Please contact the loosy team who maintains and develops this wonderful site by clicking in the mighty feedback button on the side of the page.

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