Establishing Directory Quotas - HP ProLiant 300 Series Administration Manual

The directory quota set on the system partition always has a passive limit and uses device size (capacity).
If the system does not have sufficient quota to write files, it may fail. Also, if the system partition does not
have enough space to write temporary files during boot, the system may not restart. Avoid this by using
caution when placing quotas on the system directories.
Directory quotas use each file's allocation size to determine how much space is used. The allocation size
is slightly larger than the actual space used as displayed by Windows Explorer and other Windows
programs for the data in a file. This discrepancy may cause some confusion, but the Directory Quota
feature is correctly charging the user for the amount of disk space actually consumed to store a file. Large
cluster sizes on file allocation table (FAT) file systems may add to the confusion because the entire cluster
is always allocated, regardless of the file size. NTFS file systems store very small files in the index file
and typically have more reasonable cluster sizes.
Because of the differences in the amount of storage requested for a file extension operation and the
amount actually allocated by Windows Storage Server 2003 for that extension, the user may be allowed
to exceed his quota by as much as one cluster. For example, assume the user has a quota of 100 KB and
has used 96 KB on a file system with a cluster size of 8 KB. The user creates a file of 1 KB. Windows
Storage Server 2003 requests 1024 bytes be allocated for the file. Since this is less than the remaining
quota for the user, the operation is allowed to continue. However, if the cluster size is 8 KB, Windows
Storage Server 2003 will actually allocate 8 KB for the file. The user has now used 104 KB, and while
this is allowed, future attempts to create or extend files will fail.

Establishing directory quotas

Directory quotas are established in a two-part fashion. First, a policy is defined using the policies
selection from the Directories Policy Page. After a policy is established it can be assigned to a particular
directory via the WebUI "New Directory Quota Wizard." By default there are a number of predefined
policies, which include:
• 100 MB limit
• 500 MB limit
• Best Practices report
• Default
• Monitor directory
• Partition alert
Each of these policies provides an example of a particular policy type. Custom policies should be created
to meet the needs of the environment.
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