File System Specification
■
File System Usage and Free Space
Available free space in the file system is shown differently when the file system area is checked from a CIFS
client or an NFS client.
The areas described below are displayed as used areas in the file system.
●
root Reserved Area
For NFS clients, this is an area that is accessible by administrators if free space is insufficient for general
users. In addition, this area is not recognized as an unused area or a used area from the NFS client. Note
that the capacity of this area is included in the total capacity.
For CIFS clients, this is an area that cannot be used by administrators or general users.
The capacity of root reserved area ranges from 1GB to 1,277GB, which is 1% of the user area that is specified
when creating NAS volumes (excluding the system management area).
●
Access Client Reserved Area
The reserved area that is secured in advance for the file system to read data efficiently. This area is used to
write the user data.
This area is recognized as a used area from the CIFS client, the NFS client, ETERNUS Web GUI, and ETERNUS
CLI.
The capacity of the access client reserved area (approximately 1.5GB to 6GB) depends on the NAS volume
size.
Figure 88
How Free Space Is Recognized
NAS volume
Unused area
(free capacity)
System
management
area
Access client
reserved area
root
reserved area
Approx. 300GB
User data area
Approx.
1.5GB to 6GB
Physical capacity
has been assigned
Not shown as a used area
by the "df" command, which is
executed in the UNIX/Linux client
that mounts the NFS
Shown as used areas
by the volume's properties
that are displayed in Windows
Windows client
UNIX/Linux client
4. NAS Functions
File System Specification
170
Design Guide
Summary of Contents for ETERNUS DX S5 Series
Page 335: ......