Product Notes for Digital UNIX Systems

• No support for the NFS/AFS Translator

  AFS does not support use of Digital UNIX machines as NFS/AFS Translator machines.

• No support for AdvFS as server or cache partition

  AFS does not support use of Digital UNIX's Advanced File System (AdvFS) as either a client cache partition or a server (/vicep) partition. It is acceptable to use both AdvFS and AFS on the same machine, but the cache partition and all AFS server partitions must be UFS partitions.

• No support for real-time kernel preemption or related lock modes

  AFS does not function correctly on a Digital UNIX machine when real-time preemption of system calls is enabled in the kernel. Do not enable this feature in any manner, including the following:

  • By including the following statement in the /usr/sys/conf/AFS file:

    options RT_PREEMPT_OPT

  • By including either of the following instructions in the /etc/sysconfigtab file:

    rt_preempt_opt=1 rt-preempt-opt=1

  Also, AFS does not function correctly when the value of the kernel lockmode option is other than 0 (zero, the default) or 2. Lock mode values 1, 3, and 4 are unsupported because they imply that real-time preemption is enabled (indeed, enabling real-time preemption sets the lock mode to 1 automatically).

• Building AFS from source requires /usr/sys/AFS directory

  Building AFS from source for Digital UNIX requires that certain header files (such as cpus.h) reside in the local /usr/sys/AFS directory. This directory exists only if you have previously incorporated AFS modifications into the kernel of the machine on which you are performing the compilation. Otherwise, the required header files reside only in the local directory called /usr/sys/machine_name. If the /usr/sys/AFS directory does not exist, issue the following command to create it as a link:

  # ln -s /usr/sys/[machine_name] /usr/sys/AFS

  When the compilation is complete, remove the link.