System Information and Performance17-9
is rounded up to the next highest 4K boundary. If a user tries to create a file that
would cause the directory to grow larger than the specified size limit, the users com-
mand fails.
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To balance network traffic among different interfaces, attach multiple interfaces on the
filer to the same physical network. For example, if two Ethernet interfaces on the filer
named filer are attached to the same network where four clients reside, specify in

/

etc/fstab on client1 and client2 that these clients mount from filer-0:/home. Specify in

/etc/fstab on client3 and client4 that these clients mount from filer-1:/home. This
scheme can balance the traffic among interfaces if all clients generate about the same
amount of traffic.
The filer always responds to an NFS request by sending its reply on the interface on
which the request was received.
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If your applications do not depend on having the correct access time for files, you can
disable the update of access time (atime) on an inode when a file is read. To prevent
updates, turn the no_atime_update option On. Consider turning this option On if
your filer has extremely high read traffic, for example, on a news server used by an
Internet provider, because it prevents inode updates from contending with reads from
other files.
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Turning the nfs.big_endianize_fileid option On improves performance on
directory lookups for clients that use the file ID in the file handle as a hash key in cer-
tain ways. Enable this option if your NFS clients are mainly running HP-UX or IRIX.
NOTE: If you turn the big_endianize_fileid option On, all NFS clients that
have mounted directories from the filer must unmount and remount them; otherwise,
they get stale file handle errors on all references to files already opened on the filer
until they unmount and remount all directories.
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If the file access patterns of your clients are random (nonsequential), turning minimal
read-ahead On might improve performance. By default, the filer uses aggressive read-
ahead, which enhances sequential access, which is more commonly used by UNIX
clients and applications. To specify minimal read-ahead, turn the
minra option On.
By default, the option is Off and the filer does very aggressive read-ahead.