[Bugs] [Bug 1625961] Writes taking very long time leading to system hogging

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1625961



--- Comment #1 from Pranith Kumar K <pkarampu at redhat.com> ---
I/O load generating script:
==================================
#!/usr/bin/perl
$offset=0;
#$len=2;
#while($offset<1000)
#open( $h, '>>', "$ARGV[0]" ) or die $!;
open( $h, '>', "$ARGV[0]" ) or die $!;

while(1)
{
#open( $h, '>>', "$ARGV[0]" ) or die $!;  #opening file for write in append
mode, filename is fed at cli argument

seek( $h, $offset, 1 );

#print $h "offset:$offset \n ";
print $h "offset:$offset ";
#$offset=$offset + 20;
$offset=$offset + 1;

}
==================================

1.create a 1x3 volume mount it on fuse client
2.run the perl script above on an input file where IOs must happen(infinite
loop where writes)
eg: script.pl <some_filename>
3. now reboot brick

Machine becomes slow and operations will be very very slow.

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