Ubuntu Feisty 7.04 manual page repository

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Provided by: afbackup_3.4-3ubuntu1_i386



        server.conf - server side configuration file for afbackup


        This  file needs not be edited by hand with an editor, instead the pro‐
        gram /usr/sbin/afserverconfig can be used. If you are  running  X,  the
        programs  are  the  same,  but  start  with  an  ’x’;  (Tcl/Tk  must be
        installed): and /usr/sbin/xafserverconfig.   The  parameters  described
        below  are the same for both versions.  Entries consist of lines start‐
        ing with the parameter name, then follows a colon and the value of  the
        parameter. Comment lines can be inserted as desired starting with the #


               This is the device the backup is written to. It can be any  tape
               device  with the capability to distinguish between several files
               on the media. It is mandatory to  supply  the  no-rewind  device
               here,  otherwise  this  package  won’t  work properly.  Suitable
               device names for some OS-es:
                 AIX:          /dev/rmt0.1
                 Solaris:      /dev/rmt/0bn
                 IRIX:         /dev/rmt/tps0d4nr
                 HP-UX:        /dev/rmt/0hn
                 Linux:        /dev/nst0
                 Digital UNIX: /dev/nrmt0h
                 FreeBSD:      /dev/nsa0
               If the drive has a media handler attached, a specifier for  this
               may  follow  the  device  name.  The format for this is =<drive-
               count>@<device>#<num-slots>^<num-loadbays>   ,    for    example
               =1@/dev/sg0#6^2  .  Whitespace  before and following the special
               characters = @ and # is allowed  for  readability.  The  example
               means:  The  drive  is  number 1 in the changer, /dev/sg0 is the
               changer device, that has 6 media slots and 2 loadbays. The parts
               =<drive-count> and ^<num-loadbays> are optional.
               If  the  server is only used for remote start and no real backup
               device should be accessed, a dash - should be configured here as
               device,  so  a respective warning to the server log will be sup‐
               The identifier for the server. Default: The  official  hostname,
               followed by a colon and the full path to the configuration file.
               The server identifier can be used to become independent  of  the
               server machine name. This might be helpful, if the backup server
               should move to another machine.  Whitespace  characters  may  be
               used  in this identifier, but they are replaced with asterisks *
               before comparing, so they are not significant
               The blocksize of the tape device. This value specifies how  many
               bytes  are written to tape or read from it with one system call.
               Usually this value is at least 512 or a multiple of it.   It  is
               not  very important if the blocksize is set to 2048 or 1024. The
               main thing to keep in mind is that if there  is  a  minimum,  it
               should be respected (e.g. 1024 on AIX), otherwise media space is
               Three numbers and a filename can be given here. The first number
               is  the  desired  size of the tape buffer in bytes. The optional
               second number is the high-watermark  while  writing  in  percent
               (default:  67),  the optional third number is the low watermark,
               also in percent (default: 0). As long as the  buffer  fill  rate
               does  not reach the high watermark, nothing is written, but when
               it is reached, writing does not stop until the buffer fill  rate
               is  equal  or  below the low watermark. This procedure hopefully
               reduces tape wear and increases average writing  speed,  because
               excessive  tape  stops/starts are avoided. If the optional file‐
               name is given, buffering is done in the  given  file,  which  is
               mapped  into the server’s address space for that purpose. In the
               filename, patterns are replaced like with Changer-Configuration-
               This  value  must be 1 or 0, which means, that you either have a
               cartridge handling system (i.e. some kind of robot) (1)  or  not
               (0).  If  you don’t have a robot, you may nonetheless maintain a
               set of cartridges, that you will have to manually  number.   The
               backup  server side will inform you via email or console output,
               whenever another cartridge has to be inserted into the drive and
               what number it requires it is.
        Number Of Cartridges
               This  number specifies, how many cartridges you are maintaining.
               If you have a cartridge handling system (some  kind  of  robot),
               this  is  usually  the number of cartridges, your system is jug‐
               Several cartridge sets can be used. Here they can be  specified.
               The  specifiers  for  the  cartridge  sets  must be separated by
               whitespace. Each specifier may consist  of  digits,  commas  and
               dashes.  Examples  for  cartridge  set  specifiers:  1-5  7-9,12
               6,10,11 .  This example shows how  to  specify  three  cartridge
               sets.  If  the  access to a cartridge set should be allowed only
               for certain clients, this may specified with a colon immediately
               following  the set specifier without whitespace, followed by one
               of three forms: Either a list of hostnames, separated by  commas
               and no whitespace inbetween, or the full path to a file contain‐
               ing the hostnames one per line, or by a command to be  executed.
               The command must start with a bar | and must be enclosed in dou‐
               ble quotes, if it is containing whitespace. If  %H  occurres  in
               the  command it will be replaced with the client name, who wants
               to gain access to the cartridge set. The command must exit  with
               a  status  of  0,  if access is to be granted, otherwise with an
               exit status unequal to 0. The name of the host to be checked  is
               also  written to standard input of this command, so %H needs not
               to be used. Examples specifying cartridge sets  with  restricted
                      9-15:"| fgrep .my.domain.com"
               Remember, that grep will exit with 0, if a match has been found,
               otherwise 1. Note, that localhost and the network  name  of  the
               machine  should  be  both given, if the server is also a client.
               The names to be supplied here are not the client IDs  configured
               on the client side, but the network names of the machines.
               If  this  parameter  is not given, there is only the default set
               number 1 with all available cartridges, access is  permitted  to
               any  client. Not all cartridges need to be included in a set and
               sets must not overlap.
        Max Bytes Per File
               The stream of data, that represents your backup, is divided into
               pieces  (files  on  tape). This is done to find the files faster
               during a restore. This value determines, how large the pieces on
               tape  may be in bytes. Some good values for a few tape technolo‐
                 QIC:              20000000
                 DAT:              30000000
                 Exabyte:          50000000
                 DLT:             100000000
        Max Bytes Per Tape
               With this entry the number of bytes written to a single tape can
               be  limited.  Serveral  entries  with  a leading range specifier
               allow to handle certain tapes differently. The  range  specifier
               must  end  in a colon : and may contain lists of ranges and num‐
               bers.  A given number without a leading range specifier will  be
               valid  for all tapes not explicitly described. Default is use of
               full tape capacity. Several entries must be separated by whites‐
               pace and may look like the following examples:
               4000000000 1,3-5:3500000000 7,9-:5000000000
               This  means:  3.5  GB for cartridges 1 and 3 through 5, 5 GB for
               cartridges 7 and 9 up to the last cartridge, 4 GB for the  rest.
        Full Append Mode
               Normally,  when  the  insert  (writing)  position  is  forced to
               another tape with the cartis  command  or  with  the  clientside
               option  -G,  the  rest  of the current tape remains unused. When
               this option is set to 1, it will nonetheless be  used  to  write
               data on, if there is no free tape left.
        Variable Append Mode
               In  default  mode, the place (tape and tapefile), where the next
               data will be written, is fix and can only manipulated using  the
               command  cartis  or  the  clientside  option -G. When the server
               wants to write with variable append mode enabled, any cartridge,
               that  is  in  the drive, is belonging to the right cartridge set
               and is allowed to be written, will be accepted and appended  to.
               Note,  that  this  will  also override the settings of cartis or
               option -G.
        Reject Unlabeled Tapes
               Default is to accept an unlabeled tape as the requested one  and
               to  label  it  automatically.  If this behaviour is unwanted and
               only tapes with a recognized label should be permitted for writ‐
               ing, this parameter should be set.
               When a tape gets full and another one must be chosen to continue
               writing, the server does not make a difference, whether  a  tape
               is  available in a changer or not, if this flag is not set. This
               is the default. If this parameter is set, the next cartridge  is
               chosen from those, that are available in the slots of a changer,
               if present and configured. If there is no tape found inside  the
               changer, that is allowed to be overwritten, manual administrator
               interaction is nonetheless required.
               This is the time in seconds, the  program  waits  after  another
               cartridge  has  been  put  into the drive. Normal devices need a
               certain time span to mount the tape to get  it  ready  for  use.
               Normally this value is not critical. If you estimate it too low,
               the ioctl-system-call will wait until the device becomes  avail‐
               able.  This time is sometimes longer than two minutes, so if you
               want to proceed quickly after a cartridge change, you  may  mea‐
               sure  the maximum time your system needs.  Some tried values for
               a few tape technologies:
                 QIC:         20
                 DAT:         30
                 Exabyte:     70
                 DLT:         70
               If the streaming device is not accessible (i.e.  an  open  or  a
               tape handling command fails) or another backup server process is
               still running, the server process re-tries  his  attempts  regu‐
               larly.  If  it  fails  longer  than the time in minutes supplied
               here, an e-mail is sent to the configured user in  charge  (see:
               User To Inform). Supplying 0 means: never send mail.
               Same  as  Device-Unavailable-Send-Mail-After-Min,  but this time
               not an e-mail is sent, but the  server  process  exits  silently
               leaving  a  warning in the log file. Supplying 0 means: try for‐
               ever, never exit.
        Device-Probe Interval
               This is the interval in seconds, after that regularly the device
               is  probed  to be ready for reading. Thus after having ejected a
               cartridge it is automatically recognized, if a new cartridge has
               been  inserted.  For  other media (e.g. exchangeable disks) this
               may not be suitable. Supply a 0 in these cases for no probing.
               This is the (shell-) command to run to position the  tape  to  a
               certain  file.  Usually this is something like a combination of:
               mt -f <device> rewind  and  mt -f <device> fsf <number>.  If the
               command  you  are  supplying here starts to count with 1 for the
               first file on tape, you should insert %n for the <number>. If it
               starts  with  0,  replace <number> with %m. If you don’t want to
               type the devicename again here, you may write %d instead.
               This is the (shell-) command to run to skip over to a file later
               on tape. Usually this is something like
                mt  -f  <device>  fsf  <number>  Insert %n, where the number of
               files to skip over must be supplied in the command, in the exam‐
               ple  instead of <number>, and %d, where the device should appear
               (here: <device>).
               This is the (shell-) command to run to put a  certain  cartridge
               into the device. If the command you are supplying here starts to
               count with 1 for the first cartridge, you should  insert  %n  in
               the  place, where the cartridge number must appear. If it starts
               with 0, replace it with %m. If you don’t want to type the  devi‐
               cename again here, you may write %d instead. If you don’t have a
               command to perform this task, don’t  supply  anything  here.  In
               this case you must set your cartridge handling system to sequen‐
               tial mode (automatically putting the next cartridge in, when the
               current one is ejected).
               This  is  the  (shell-) command to run to eject a cartridge cur‐
               rently placed inside the streamer device. This is normally some‐
               thing  like   mt  -f  <device> rewoffl  (but better consult your
               man-pages). You have to supply this either if you have  no  car‐
               tridge  handling system (robot) or if you have no command to set
               the cartridge directly by number. In the latter case this  pack‐
               age  tries  to maintain the number of the current cartridge in a
               file and to (hopefully) keep it consistent with the reality.  In
               this  case  the  cartridge handling system must be configured to
               sequential mode (automatically putting the  next  cartridge  in,
               when  the  current  one  is ejected). The pattern %c, if used in
               this command, will be replaced with number of the  current  car‐
               tridge,  %n with the number of the next one, that is expected to
               be put into the streamer by a robot in sequential mode.  %b  can
               be  used  instead  of %c if counting of cartridges starts with 0
               and not with 1. The same applies for %m, what means %n minus  1.
               %d is replaced with the device name.
               The (shell-) command, the server runs before accessing the stor‐
               age media for the first time or after changing it.  %d  will  be
               replaced with the device. This command can be used e.g. to auto‐
               matically mount a removable disk after inserting.  This  command
               might  be  called  several  times on the same media, this has to
               kept in mind when configuring it. %n is replaced with the number
               of  the  cartridge,  that  is expected to in the drive, when the
               next media access operation will take  place.   %m  is  replaced
               with  %n  -  1 i.e. assuming that the cartridge numbering starts
               with zero, not one. Note, that the cartridge, that  will  really
               be  in the drive is not necessarily known at the time, the Init-
               Media-Command is running. Thus the term "expected".
               The (shell-) command to run, if the tape must be erased.  (actu‐
               ally not needed).
               The (shell-) command to run, when a tape is full. %d is replaced
               with the device name, %c with the number of the cartridge,  that
               became  full,  %n  with  the number of cycles, the cartridge has
               become full until now and %C with the full path to the  configu‐
               ration file.
        User To Inform
               If  you  don’t have a cartridge handling system (robot), a human
               maintainer must put the  appropriate  cartridge  into  the  tape
               device.  If  you supply a mail program, an e-mail is sent to the
               user given here, which informs him, that and which cartridge (by
               number) must be put into the tape device.  If a timespan is con‐
               figured, after that an automatic e-mail should be sent due to an
               unaccessible  tape  device,  it  is  directed  to this user (see
               The mail program used to send messages to  a  human  maintainer.
               This  is  done,  whenever another cartridge must be put into the
               tape device and it can’t be done automatically (by  a  robot  or
               whatever).  If  you  don’t want to type the username again here,
               you can instead write %u . The pattern %U will be replaced  with
               the login name of a current user on the client side, %H with the
               name of the client host. If  none  could  be  figured  out,  the
               entire word containing %U or %H is deleted from the command.  If
               you don’t want mails to be sent,  you  may  instead  supply  any
               other  command, that reads the standard input and does something
               reasonable with it, e.g. redirects it to the console:
                cat > /dev/console
               The directory, where varying files should be put in. These files
               should not be deleted. The information they contain is necessary
               for the server to work properly
               In this file some values are stored, e.g. the number of the car‐
               tridge currently placed inside the streamer device.
               Logging information concerning errors or other notable events is
               redirected to this file. If the first  word  of  this  entry  is
               starting with @, then logging is directed to the syslog as well.
               If there are characters immediately following the @,  this  word
               is  used  as  the syslog identifier, otherwise the identifier is
               afbackup. If writing to the syslog is configured,  the  rest  of
               the entry is used as additional logging file, if present.
               The  current status of the server is written to this file. If it
               starts with >>, then the file is  created  and  status  messages
               will  be  appended  to  it. Otherwise the file is removed before
               writing. %V in the filename is replaced with the configured Var-
               To prevent the server program from being started several times a
               lock file is created and this is it’s name.
               Entries specifying  files,  that  contain  encryption  keys  for
               authenticating backup clients to the server. Each entry consists
               of a filename, optionally followed by a colon : and a  specifier
               for  client selection. If an entry lacks a client selector, this
               one will apply for all clients, that  are  not  matched  by  any
               other entry. The client selector is either a list of comma-sepa‐
               rated hostnames, a filename starting with a slash  /  containing
               hostnames  one  per line, or a command starting with a bar, that
               is stripped off before starting the command.  The  command  gets
               the  current client name as input on stdin, aside from arguments
               containing patterns (see below). If the command returns an  exit
               status  of  0, the client name will match the entry. Entries are
               separated by whitespace. If an entry must contain whitespace, it
               must  be  enclosed by double quotes. If colons are needed within
               the filenames, they must be escaped using a backslash. Each  key
               file  must  contain at least 5 characters and must not have read
               permission for group or world. The pattern %H is  replaced  with
               the  client name resolved from the IP-address.  %h is similar to
               %H, but everything from and including the first dot is  stripped
               off. For more pattern replacements see: Status-file.
               If you are using the remote start option for backing up clients,
               this is the directory, where programs must reside, that  can  be
               started remotely. No other programs can be started remotely (for
               security reasons).
               Here you may supply a (shell-)  command  to  be  run,  when  the
               backup  server side wakes up, i.e. the server process starts.  A
               %p appearing in this command is replaced with the  name  of  the
               client, that connected the backup service.
               Here  you  may  supply  a  (shell-)  command to be run, when the
               backup server side goes to sleep, i.e. the server process  ends.
               A  %p appearing in this command is replaced with the name of the
               client, that connected the backup service.


               Server configuration file
               The directory for logging the server actions
               Some internal state information of the server.


        afbackup  was  written  by Albert Fluegel (af@muc.de). This manpage was
        extracted  from  the  text  docs  by  Christian  Meder  (meder@isr.uni-


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