What is disk quota and how can I check it?
Disk quota is a restriction placed on users’ accounts in order to prevent one person from using all the disk space available on a server and denying resources for other users. There are four different numbers: soft and hard disk blocks, and soft and hard inodes. Soft quotas are where the system will start to complain about your disk usage, and will prevent additional usage after 7 days if you do not free some space. Hard quotas are absolute upper limits. Disk blocks are physical disk space (1 disk block is 512 bytes), and inodes are used at the rate of 1 inode per file.
