Hello Monks,

I'm trying to do consistent writes to a NFS folder that can go offline for maybe 30 seconds while i'm writing in it. I tried different things and ended with the following code : 

$| = 1 ; 
my $fh  ;
    for my $master (1..100) {
        for my $fast (1..50000) {
                unless ( print $fh "PRINT OK $master $fast\n" ) {
                        my $now = localtime ;
                        print "Failed $it $master $fast at ", $now,  "
+\n" ;
                        close $fh ;
                        sleep 1 ;
                        my $ok = 0 ;
                        while ($ok == 0)  {
                                if (open $fh, ">>", "/mnt/fs_1/ttt.$it
+.txt") {
                                        print $fh "PRINT OK $master $f
+ast\n" ;
                                        $ok = 1 ;
                                } else {
                                        my $now = localtime ;
                                        print "Failed delayed write fo
+r $it $master $fast ", $now,  "\n" ;
                                        sleep 1 ;
                                }
                        }
                }
   }}

[download]

I also tried without closing the filehandle, just repeating the if (print "...) until it's ok, but in both versions i still end up losing some data ! That is, it seems there's a delay between the moment the nfs folder becomes unavailable and the moment the OS (and my script) become aware of it.

Is there a specific way to handle writes to nfs folders ?

Thanks for your advice !

In reply to Delaying NFS writes by ZlR

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