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I know that modern *nix OSes allow to open file so that data are not cached in system/disk writecache, so any write operation will finish only when data is phisically written to disk.
Could you suggest how can I do that in Perl?
OS is AIX/Solaris.
Use the sysopen function with O_SYNC as one of the flags. Check in the system manpages for the supported flags (man 2 open). I know it’s there on Solaris 10, not sure about AIX. For example:
See http://perldoc.perl.org/functions/sysopen.html for more information.