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https://btrfs.wiki.kernel.org/index.php/Quota_support
Quota support in BTRFS is implemented at a subvolume level by the use of quota groups or qgroup.Since kernel 3.11, it is possible to rescan the filesystem so that subvolumes created before quota was enabled gets accounted for.. In the quota system, each subvolume is assigned a quota groups in the form of 0/<subvolume id>.
https://www.liquidweb.com/kb/how-to-check-the-kernel-version-in-linux-ubuntu-centos/
Aug 05, 2019 · In this article, we are discussing how to check the kernel version in both Ubuntu and CentOS Linux. The following command works with all Linux distributions, such as Red Hat, CentOS, Debian, and Ubuntu. It also works on other UNIX-like operating systems such as HPUX, FreeBSD, OpenBSD, Solaris
https://www.tecmint.com/set-filesystem-disk-quotas-on-ubuntu/
Sep 07, 2017 · Filesystem quota is a standard built-in feature found in Linux Kernel. Quotas determine the amount of space a file should have to support user activities. The disk quotas also limit the number of files a user can create on the system. Filesystems that support the quota system include xfs, ext2, ext4, and ext3 to mention a few.
http://www.tldp.org/HOWTO/Quota-3.html
Reconfigure your kernel and add quota support. Via `make menuconfig` or `make xconfig` you can find the option to support quota under the Filesystems-menu. You can specify extra options if you need them, like 32-bit UID support. Save the configuration and compile the kernel. Make sure the new kernel will be used when rebooting the system.
https://www.freebsd.org/doc/handbook/quotas.html
To determine if the FreeBSD kernel provides support for disk quotas: % sysctl kern.features.ufs_quota kern.features.ufs_quota: 1 In this example, the 1 indicates quota support. If the value is instead 0, add the following line to a custom kernel configuration file and rebuild the kernel using the instructions in Chapter 8, Configuring the FreeBSD Kernel:
https://developer.ibm.com/tutorials/l-lpic1-104-4/
Journaled version 2 quotas are supported on kernel 2.6.11 and above. Version 1 quota support is sometimes referred to as vfsold, while Version 2 quota support is sometimes referred to as vfsv0 (32-bit UIDs / GIDs, 64-bit space usage, 32-bit inode usage and limits) or vfsv1 (64-bit quota limits and usage). Adding quota support to /etc/fstab
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/storage_administration_guide/ch-disk-quotas
The -c option specifies that the quota files should be created for each file system with quotas enabled, the -u option specifies to check for user quotas, and the -g option specifies to check for group quotas.
https://ext4.wiki.kernel.org/index.php/Quota
Kernel Support . Support for the quota feature first appeared in the 3.6 upstream kernel version. There is a bug which will not be fixed until v3.8 which will cause ext4 to fail to mount a file system with quotas if the quota code is built as a module.
https://geek-university.com/linux/enable-quota-support/
3. create quota files – the last step is to run the quotacheck command. This command scans the file systems that are quota enabled and builds a table of the current disk usage of the file systems. This command accepts a couple of options:-c – performs a new scan and saves the file to the hard disk.-u – specifies only user quotas.
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