File Systems

File Systems Layer contains directories (also known as folders) and files that are accessed, managed, and updated through the use of databases, middle tier applications, and end-user tools. They can be broadly categorized into local file systems that are disk based and remote file systems like NFS. In Enterprise Manager, summary attributes are provided for local file systems and the Writeable NFS part of File Systems layer.

Local File Systems

Local File Systems are based on disk storage visible to the host. Various operating systems support different types of local file systems. The following table provides examples:

Local File System	Operating System
lofs	Solaris (Monitored only if NMUPM_SUPPORT_LOFS property is set to 1 for the target instance.)
nfs	Solaris, Linux
tmpfs	Solaris
ufs	Solaris, Linux, AIX, HP
vxfs	Solaris, Linux, AIX, HP
zfs	Solaris, Linux, AIX
ext2	Linux, AIX
ext3	Linux, AIX

NFS

Network File Systems (NFS) are accessible over the network from the host. A remote server (NFS Server) performs the I/O to the actual disks. There are appliances that provide dedicated NFS Server functionality, such as Network Appliance Filer. There are also host systems, for example, Solaris and Linux, that can act as both NFS Server and Client.

Writeable NFS refers to the NFS mounted on a host with write privilege.

Suggestions for Monitoring NFS Mounts

The following are suggestions on monitoring NFS mounts.

• Monitor the remote host if NFS exports are coming from another host supported by Enterprise Manager. The Filesystems metric will monitor the local file systems on the remote host.

• Monitor the Netapp Filer if NFS exports are coming from a remote Netapp Filer. Volumes and Qtress metrics will monitor the exports from the remote Netapp Filer.

• Use the 'File and Directory Monitoring' metric if any of the previous choices do not meet the need. Set the threshold against the 'File or Directory Size' metric to monitor specific remote mounts.