AMD(8) AMD(8) NNAAMMEE amd - automatically mount file systems SSYYNNOOPPSSIISS aammdd --HH aammdd [ --FF _c_o_n_f___f_i_l_e ] aammdd [ --nnpprrvvHHSS ] [ --aa _m_o_u_n_t___p_o_i_n_t ] [ --cc _d_u_r_a_t_i_o_n ] [ --dd _d_o_m_a_i_n ] [ --kk _k_e_r_n_e_l_-_a_r_c_h ] [ --ll _l_o_g_f_i_l_e ] [ --oo _o_p___s_y_s___v_e_r ] [ --tt _i_n_t_e_r_v_a_l_._i_n_t_e_r_v_a_l ] [ --ww _i_n_t_e_r_v_a_l ] [ --xx _l_o_g_-_o_p_t_i_o_n ] [ --yy _Y_P_-_d_o_m_a_i_n ] [ --CC _c_l_u_s_t_e_r_-_n_a_m_e ] [ --DD _o_p_t_i_o_n ] [ --FF _c_o_n_f___f_i_l_e ] [ --OO _o_p___s_y_s___n_a_m_e ] [ --TT _t_a_g ] [ _d_i_r_e_c_t_o_r_y _m_a_p_- _n_a_m_e [ _-_m_a_p_-_o_p_t_i_o_n_s ] ] ... DDEESSCCRRIIPPTTIIOONN AAmmdd is a daemon that automatically mounts filesystems whenever a file or directory within that filesystem is accessed. Filesystems are automatically unmounted when they appear to have become quiescent. AAmmdd operates by attaching itself as an NFS server to each of the specified _d_i_r_e_c_t_o_r_i_e_s.. Lookups within the speci- fied directories are handled by aammdd, which uses the map defined by _m_a_p_n_a_m_e to determine how to resolve the lookup. Generally, this will be a host name, some filesystem information and some mount options for the given filesys- tem. In the first form depicted above, aammdd will print a short help string. In the second form, if no options are speci- fied, or the --FF is used, aammdd will read configuration parameters from the file _c_o_n_f___f_i_l_e which defaults to //eettcc//aammdd..ccoonnff. The last form is described below. OOPPTTIIOONNSS --aa _t_e_m_p_o_r_a_r_y_-_d_i_r_e_c_t_o_r_y Specify an alternative location for the real mount points. The default is //aa. --cc _d_u_r_a_t_i_o_n Specify a _d_u_r_a_t_i_o_n, in seconds, that a looked up name remains cached when not in use. The default is 5 minutes. --dd _d_o_m_a_i_n Specify the local domain name. If this option is not given the domain name is determined from the hostname. --kk _k_e_r_n_e_l_-_a_r_c_h Specifies the kernel architecture. This is used solely to set the ${karch} selector. --ll _l_o_g_f_i_l_e Specify a logfile in which to record mount and unmount events. If _l_o_g_f_i_l_e is the string ssyysslloogg then the log messages will be sent to the system log daemon by _s_y_s_l_o_g(3). The default syslog facil- ity used is LOG_DAEMON. If you wish to change it, append its name to the log file name, delimited by a single colon. For example, if _l_o_g_f_i_l_e is the string ssyysslloogg::llooccaall77 then AAmmdd will log messages via _s_y_s_l_o_g(3) using the LOG_LOCAL7 facility (if it exists on the system). --nn Normalize hostnames. The name refereed to by ${rhost} is normalized relative to the host database before being used. The effect is to translate aliases into ``official'' names. --oo _o_p___s_y_s___v_e_r Override the compiled-in version number of the operating system. Useful when the built in version is not desired for backward compatibility reasons. For example, if the build in version is ``2.5.1'', you can override it to ``5.5.1'', and use older maps that were written with the latter in mind. --pp Print PID. Outputs the process-id of aammdd to stan- dard output where it can be saved into a file. --rr Restart existing mounts. AAmmdd will scan the mount file table to determine which filesystems are cur- rently mounted. Whenever one of these would have been auto-mounted, aammdd _i_n_h_e_r_i_t_s it. --tt _t_i_m_e_o_u_t_._r_e_t_r_a_n_s_m_i_t Specify the NFS timeout _i_n_t_e_r_v_a_l, in tenths of a second, between NFS/RPC retries (for UDP only). The default is 0.8 seconds. The second value alters the restransmit counter, which defaults to 11 retransmissions. Both of these values are used by the kernel to communicate with amd. Useful defaults are supplied if either or both values are missing. Amd relies on the kernel RPC retransmit mechanism to trigger mount retries. The values of these parameters change the overall retry interval. Too long an interval gives poor interactive response; too short an interval causes excessive retries. --vv Version. Displays version and configuration infor- mation on standard error. --ww _i_n_t_e_r_v_a_l Specify an _i_n_t_e_r_v_a_l, in seconds, between attempts to dismount filesystems that have exceeded their cached times. The default is 2 minutes. --xx _o_p_t_i_o_n_s Specify run-time logging options. The options are a comma separated list chosen from: fatal, error, user, warn, info, map, stats, all. --yy _d_o_m_a_i_n Specify an alternative NIS domain from which to fetch the NIS maps. The default is the system domain name. This option is ignored if NIS support is not available. --CC _c_l_u_s_t_e_r_-_n_a_m_e Specify an alternative HP-UX cluster name to use. --DD _o_p_t_i_o_n Select from a variety of debug options. Prefixing an option with the strings nnoo reverses the effect of that option. Options are cumulative. The most useful option is aallll. Since _-_D is only used for debugging other options are not documented here: the current supported set of options is listed by the -v option and a fuller description is available in the program source. --FF _c_o_n_f___f_i_l_e Specify an amd configuration file to use. See aammdd..ccoonnff(5) for description of this file's format. This configuration file is used to specify any options in lieu of typing many of them on the com- mand line. The _a_m_d_._c_o_n_f file includes directives for every command line option amd has, and many more that are only available via the configuration file facility. The configuration file specified by this option is processed after all other options had been processed, regardless of the actual loca- tion of this option on the command line. --HH Print help and usage string. --OO _o_p___s_y_s___n_a_m_e Override the compiled-in name of the operating sys- tem. Useful when the built in name is not desired for backward compatibility reasons. For example, if the build in name is ``sunos5'', you can over- ride it to ``sos5'', and use older maps which were written with the latter in mind. --SS Do not lock the running executable pages of amd into memory. To improve amd's performance, systems that support the pplloocckk(3) call, could lock the amd process into memory. This way there is less chance the operating system will schedule, page out, and swap the amd process as needed. This tends improves amd's performance, at the cost of reserv- ing the memory used by the amd process (making it unavailable for other processes). If this behavior is not desired, use the --SS option. --TT _t_a_g Specify a tag to use with aammdd..ccoonnff(5). All map entries tagged with _t_a_g will be processed. Map entries that are not tagged are always processed. Map entries that are tagged with a tag other than _t_a_g will not be processed. FFIILLEESS //aa directory under which filesystems are dynamically mounted //eettcc//aammdd..ccoonnff default configuration file CCAAVVEEAATTSS Some care may be required when creating a mount map. Symbolic links on an NFS filesystem can be incredibly inefficient. In most implementations of NFS, their inter- polations are not cached by the kernel and each time a symlink is encountered during a _l_o_o_k_u_p_p_n translation it costs an RPC call to the NFS server. It would appear that a large improvement in real-time performance could be gained by adding a cache somewhere. Replacing symlinks with a suitable incarnation of the auto-mounter results in a large real-time speedup, but also causes a large number of process context switches. A weird imagination is most useful to gain full advantage of all the features. SSEEEE AALLSSOO aammdd..ccoonnff(5), aammqq(8), ddoommaaiinnnnaammee(1), hhoossttnnaammee(1), aauuttoo-- mmoouunntt(8), mmoouunntt(8), uummoouunntt(8), mmttaabb(5), ssyysslloogg(3). _A_m_d _- _T_h_e _4_._4 _B_S_D _A_u_t_o_m_o_u_n_t_e_r AAUUTTHHOORRSS Jan-Simon Pendry , Department of Comput- ing, Imperial College, London, UK. Erez Zadok , Department of Computer Science, Columbia University, New York, USA. Other authors and contributors to am-utils are listed in the AAUUTTHHOORRSS file distributed with am-utils. 3 November 1989 AMD(8)