arc(1M)                                                             arc(1M)

NAME
     arc - array reconstruction

SYNOPSIS
     arc -z hw-addr [-P] [-s] [-F {d|freq}] [-a {d|amount}]

DESCRIPTION
     arc provides a means for controlling the reconstruction of data on
     disk drives which have been replaced or otherwise repaired after hav-
     ing been taken off-line.

     The first argument, hw-addr, is a string of characters giving the
     hardware address of the "object" to which the command is directed -
     this can be a logical unit or a physical drive. hw-addr has exactly
     one of the following forms:

          iosb/sraidppull

          iosb/sraidppu:bp

     The first form specifies a logical unit, the second one refers to a
     physical drive.

     The naming conventions are as follows:

     b    RM400: 0 (on-board iobus) or 1 (peripheral bus)

          RM600: always 0

     pp   RM400: the SCSI Host Adaptor port number

          RM600: the logical controller number

     u    the device's unit number

     l    the logical unit name; this may range from 0 to 7

     :    separator between array controller name and backend drive parts
          of hw-addr

     After the separator, the naming conventions are as follows:

     b    specifies the SCSI bus of the array controller

     p    specifies the target ID of the array controller

     Some examples of valid hardware address notation:

     ios0/sraid041l0
          system bus 0, host controller 04, unit number 1, LUN 0





Page 1                       Reliant UNIX 5.44                Printed 11/98

arc(1M)                                                             arc(1M)

     ios0/sraid041:15
          system bus 0, host controller 04, unit number 1, physical drive
          on SCSI bus 1 and target id 5 of the array controller

OPTIONS
     -P   This option displays the progress of the reconstruction as a per-
          centage. (For this option, the hardware address must refer to a
          logical unit, as in iosb/sraidppull.)

     -s   This option notifies the array controller of a drive replacement
          and initiates the reconstruction. (For this option, the hardware
          address must refer to a drive, as in iosb/sraidppu:bp.)

     -F {d|freq}
          This argument is the reconstruction frequency, or the number of
          tenths of a second to delay between instances of reconstruction
          activity. If "d" is specified, the current reconstruction fre-
          quency is displayed; if freq is specified, the reconstruction
          frequency is set to freq. (For this option, the hardware address
          must refer to a logical unit, as in iosb/sraidppull.)

     -a {d|amount}
          This argument is the reconstruction amount, or the number of
          blocks to reconstruct once reconstruction activity is initiated.
          If "d" is specified, the current reconstruction amount is
          displayed; if amount is specified, the reconstruction amount is
          set to amount. (For this option, the hardware address must refer
          to a logical unit, as in iosb/sraidppull.)

EXIT STATUS
     0 =  Error-free termination

     1 =  Command line syntax error

     2 =  Argument not in acceptable range

     3 =  Error opening a file or device

     4 =  SCSI-bus or SCSI-device-related error condition

     5 =  Non-specific error

     6 =  Insufficient memory

NOTES
     Invoking arc with invalid arguments will cause usage information to be
     displayed.

SEE ALSO
     acf(1M), apc(1M), apr(1M), can(1M), lad(1M).




Page 2                       Reliant UNIX 5.44                Printed 11/98