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3 Configuring quotas

Quotas can be assigned to individual users or groups, or to a directory tree. Individual quotas

limit the amount of storage or the number of files that a user or group can use in a file system.

Directory tree quotas limit the amount of storage and the number of files that can be created on a

file system located at a specific directory tree. Note the following:

• You can assign quotas to a user, group, or directory on the GUI or from the CLI. You can also

import quota information from a file.

• If a user has a user quota and a group quota for the same file system, the first quota reached

takes precedence.

• Nested directory quotas are not supported. You cannot configure quotas on a subdirectory

differently than the parent directory.

• The existing quota configuration can be exported to a file at any time.

NOTE: HP recommends that you export the quota configuration and save the resulting file

whenever you update quotas on your cluster.

How quotas work

Quotas can be set for users, groups, or directories in a file system. A quota is specified by hard

and soft storage limits for both the megabytes of storage and the number of files allotted to the

user, group, or directory. The hard limit is the maximum storage (in terms of file size and number

of files) allotted to the user, group, or directory. The soft limit specifies the number of megabytes

or files that, when reached, starts a countdown timer.

If the megabytes of storage or number of files are not reduced below the soft limit, the timer runs

until either the hard storage limit is reached or the grace period for the timer elapses. (The default

grace period is seven days.) When the timer stops, the user, group, or directory for which the

quota was set cannot store any more data, and the system issues quota exceeded messages at

each write attempt.

NOTE: Quota statistics are updated on a regular basis (at one-minute intervals). At each update,

the file and storage usage for each quota-enabled user, group, or directory tree is queried, and

the result is distributed to all file serving nodes. Users or groups can temporarily exceed their quota

if the allocation policy in effect for a file system causes their data to be written to different file

serving nodes during the statistics update interval. In this situation, it is possible for the storage

usage visible to each file serving node to be below or at the quota limit while the aggregate storage

use exceeds the limit.

There is a delay of several minutes between the time a command to update quotas is executed

and when the results are displayed by the ibrix_edquota -l command. This is normal behavior.

Enabling quotas on a file system and setting grace periods

Before you can set quota limits, quotas must be enabled on the file system. You can enable quotas

on a file system at any time.

To view the current quotas configuration on the GUI, select the file system and then select Quotas

from the lower Navigator. The Quotas Summary panel specifies whether quotas are enabled and

lists the grace periods for blocks and inodes.

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Hp StoreAll Storage User Manual Page 25