You can enable quotas at mount time or after a file system is mounted. The root directory of the file system must contain a file named quotas that is owned by root.
To turn on quotas
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Turn on quotas for a mounted file system:
vxquotaon mount_point
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Mount a file system and turn on quotas at the same time:
mount -t vxfs -o quota special
mount_point
If the root directory does not contain a quotas file, the mount command succeeds, but quotas are not turned on.