Comments for pixelchaos.net

Comment on Set up a bluetooth keyboard in Debian Etch by shelby

shelby — Sat, 27 Sep 2008 17:42:38 +0000

When I have setup bluetooth devices I have always used hidd –search from the command line and that should connect it. If all else it will give you the bluetooth address and you can then use the hidd –connect

Comment on Coraid Odyssey: Part 6 (sata_mv hotplug) by jcl

jcl — Sat, 13 Sep 2008 12:00:58 +0000

Mark,

I have had no such problems with the Seagate Barracuda ES.2 drives (ST31000340NS). In fact, the only small issue I’ve seen with this whole rig at all is related to the immaturity of the sata_mv driver (I think).

Even under kernel 2.6.26-1-686 in Debian 5.0 (Lenny) I occasionally see drives that have just been hot plugged hit a performance cap of about 13MB/s. If you simply wait several minutes the issue seems to go away and the drives start performing at a more normal 110MB/s or so.

I suppose it is possible that the issue is actually caused by something in the firmware of the ES.2 drives and Linux/sata_mv just deals with it better than Plan9 on the Coraid boxes?

Comment on Coraid Odyssey: Part 6 (sata_mv hotplug) by Mark

Mark — Sat, 13 Sep 2008 06:13:18 +0000

I would be interested to hear how you ST31000340NS disks went over time, as Coraid have reports of issues with them just stopping. A hot unplug/replug apparently brings them back to life.

Comment on Coraid Odyssey: Part 1 (building the chassis) by Performance testing Linux software RAID at pixelchaos.net

Performance testing Linux software RAID at pixelchaos.net — Fri, 12 Sep 2008 17:39:35 +0000

[...] Our test system, for those who dont follow this blog regularly, is a Supermicro X7DVL-E motherboard with a single Intel Core2 Xeon 5130 @ 2Ghz with 2GB of BLAH RAM. The disks used are Seagate ES.2 1TB SATA-II models hooked up to two Supermicro AOC-SAT2-MV8 8-port PCI-X SATA controllers. More complete specs are outlined in my original post where I was building the chassis, which can be found here. [...]

Comment on flac2mp3: batch flac to mp3 converter by curts

curts — Sun, 27 Jul 2008 21:52:50 +0000

Using Waldmeister’s Perl script as a starting point, I’ve streamlined it, made it more robust, made some corrections for Ubuntu, and added some features I needed. I hope others will find it useful.

#!/usr/bin/perl
#
# added some code to get id3 info in your mp3s
use Getopt::Std;

my $opt_string = ‘ho:p:’;

getopts( "$opt_string", \%opt ) or usage();

usage() if $opt{h};

$opt{o} = "." if ( $opt{o} eq "" );

sub usage() {

  print STDERR &#60;< "EOF";
  usage: $0 [-h] [-o directory] [-p prefix] file.flac [file.flac …]
    -h                    help (this message)

    -o directory          optional destination for MP3 files

    -p prefix             optional text to prepend to each MP3 file
EOF

  exit;

}
if ( ! -d $opt{o} ) {

  print "’$opt{o}’ is not a valid directory for output, using current directory…\n";

  $opt{o} = ".";

}

# PROGRAMME

$flac=flac;

$metaflac=metaflac;

$lame=lame;

# OPTIONEN

$lame_opt="–preset extreme -V2 –add-id3v2 –tc \"Curtis Schroeder\" ";

$flacinfo="flacinfo.txt";
print "*** flac2mp3 — Converts .flac to .mp3\n";
foreach (@ARGV) {

  print "\n\n*** Now processing ", $_, "\n";

  if (!($_ =~ /\.flac$/)) {

    print "Skipping $_\n";

    next;

  }
  # Convert spaces in filename to underscores as flac can’t handle spaces

  if ( $_ =~ /\ /) {

     $file = $_;

     $file =~ s/ /_/g;

     system("mv ‘$_’ ‘$file’");

  }

  else { $file = $_ }
  # getting the meta data (title, album, etc.)

  system("$metaflac –export-tags-to=$flacinfo ‘$file’");

  open ( $info, "$flacinfo" ) or die "No such file: $flacinfo\n";

  my @metainfo;

  while ( ! eof $info ) {

    $line = ;

    chomp $line;

    @metainfo = split /=/, $line;
    if   ( $metainfo[0] =~ /ARTIST/i ) { $ARTIST  = $metainfo[1]; }

    elsif( $metainfo[0] =~ /ALBUM/i )  { $ALBUM   = $metainfo[1]; }

    elsif( $metainfo[0] =~ /DATE/i )   { $YEAR    = $metainfo[1]; }

    elsif( $metainfo[0] =~ /TITLE/i )  { $TITLE   = $metainfo[1]; }

    elsif( $metainfo[0] =~ /TRACKN/i ) { $TRACKNo = $metainfo[1]; }

  }
  # Remove leading zero from track number

  $TRACKNo =~ s/0(\d)/$1/;
  # Metainfo for lame

  $LAMEmeta="–tt \"$TITLE\" –ta \"$ARTIST\" –tl \"$ALBUM\" –tn $TRACKNo –ty $YEAR ";
  # Now converting follows

  system("$flac -d ‘$file’");

  $file =~ s/\.flac$/.wav/;

  $target = $file;

  $target =~ s/\.wav$/.mp3/;

  system("$lame $lame_opt $LAMEmeta ‘$file’ ‘$opt{o}/$opt{p}$target’");

  unlink $file;

  print "\n";

}

unlink $flacinfo;

Comment on Coraid Odyssey: Part 1 (building the chassis) by Richard

Richard — Wed, 23 Jul 2008 15:34:03 +0000

I recently embarked on a Coraid journey myself and am finding myself frustrated and disappointed in general. Let’s just say that I’ve had a Coraid box (actually 2) for almost 4 months and still haven’t moved any data onto it permanently.

I really like that you built your own server - it looks much better then my Coraid unit. :/ It also runs Debian (which I love) instead of Plan 9 (which just cornfuses me).

Later…
Richard

BTW: I think I’m going to steal your “backup RAID1 mirror” idea! I think a trio of 1TB disks would do nicely for an offsite backup plan. Thanx!

Comment on VLAN Bridging in Xen by jcl

jcl — Fri, 18 Jul 2008 12:11:38 +0000

phyber,

Excellent info. Thanks!

Comment on VLAN Bridging in Xen by phyber

phyber — Thu, 17 Jul 2008 14:14:57 +0000

It’s possible to name your Xen interfaces so that your output from various commands looks a little nicer and makes it easier to tell what’s what when you’re looking at interface listings.
I like to use the primary function of the domU as my interface names. So I end up with interfaces like ‘www0′ or ‘mail0′.

You can do this by using ‘vifname=somename’ in the ‘vif = [ ]‘ config for each of your domUs.

Comment on flac2mp3: batch flac to mp3 converter by Waldmeister

Waldmeister — Fri, 09 May 2008 22:22:48 +0000

Some funny things happen while using Provoxy:

open ( IN, “$flacinfo” ) or die “No such file: $flacinfo\n”;

It should read _o p e n_, not PrivoxyWindowOpen.

Comment on flac2mp3: batch flac to mp3 converter by Waldmeister

Waldmeister — Fri, 09 May 2008 22:18:09 +0000

#!/usr/bin/perl
#
# added some code to get id3 info in your mp3s
# PROGRAMME

$flac=flac;

$metaflac=metaflac;

$lame=lame;

# OPTIONEN

$lame_opt="–preset extreme –add-id3v2 –tc \"Waldmeisters Musiktruhe\" ";

$flacinfo="flacinfo.txt";
print "*** flac2mp3  – Converts .flac to .mp3\n";
foreach (@ARGV) {

print "\n\n*** Now processing ", $_, "\n";

if (!($_ =~ /\.flac$/)) {

print "Skipping $_\n";

next;

}
# getting the meta data (title, interpret, etc.)

system("$metaflac –export-tags-to=$flacinfo $_");

open ( IN, "$flacinfo" ) or die "No such file: $flacinfo\n";

$i = 0;

while ( $line =  ) {

  chomp $line;

  ($metainfo[$i],$metainfo[$i 1]) = split (m/=/, $line);

  $i =2;

}
for( $i = 0; $i &#60; @metainfo; $i   ) {

  if( $metainfo[$i] =~ /ARTIST/ ) { $ARTIST = $metainfo[$i 1]; }

  elsif( $metainfo[$i] =~ /ALBUM/ ) { $ALBUM= $metainfo[$i 1]; }

  elsif( $metainfo[$i] =~ /YEAR/ ) { $YEAR= $metainfo[$i 1]; }

  elsif( $metainfo[$i] =~ /TITLE/ ) { $TITLE= $metainfo[$i 1]; }

  elsif( $metainfo[$i] =~ /TRACKNo/ ) { $TRACKNo= $metainfo[$i 1]; }

}
# Metainfo for lame

$LAMEmeta="–tt \"$TITLE\" –ta \"$ARTIST\" –tl \"$ALBUM\" –tn $TRACKNo –ty $YEAR  ";
# now converting follows

`$flac -d "$_"`;

$_ =~ s/\.flac$/.wav/;

$target = $_;

$target =~ s/\.wav$/.mp3/;

`$lame $lame_opt $LAMEmeta "$_" "$target"`;

`rm "$_"`;

}
`rm $flacinfo`;

print "\n";