# Administration Reference

## sysid

Purpose

Lists file server machine interface addresses registered in VLDB

Description

The sysid file records the network interface addresses that the File Server (fileserver process) registers in the Volume Location Database (VLDB) for the local file server machine.

Each time the File Server restarts, it builds a list of interfaces on the local machine by reading the /usr/afs/local/NetInfo file, if it exists. If the file does not exist, the File Server uses the list of network interfaces configured with the operating system. It then removes from the list any addresses that appear in the /usr/afs/local/NetRestrict file, if it exists. The File Server records the resulting list in the binary-format sysid file and registers the interfaces in the VLDB.

When the Cache Manager requests volume location information, the Volume Location (VL) Server provides all of the interfaces registered for each server machine that houses the volume. This enables the Cache Manager to make use of multiple addresses when accessing AFS data stored on a multihomed file server machine.

Cautions

The sysid file is unique to each file server machine, and must not be copied from one machine to another. If it is a common practice in the cell to copy the contents of the /usr/afs/local directory from an existing file server machine to a newly installed one, be sure to remove the sysid file from the new machine before starting the fs trio of processes, which includes the fileserver process.

Some versions of AFS limit how many of a file server machine's interface addresses that can be registered. Consult the AFS Release Notes.

Related Information

NetInfo (server version)

NetRestrict (server version)

vldb.DB0 and vldb.DBSYS1

fileserver

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