First: Sorry for the shameless self advertising, but...
I uploaded two lustre-related modules to the CPAN:
#1: Lustre::Info provides easy access to information located
at /proc/fs/lustre, it also comes with a 'performance monitoring'
script called 'lustre-info.pl'
#2 Lustre::LFS offers IO::Dir and IO::File-like filehandles but
with additional lustre-specific features ($dir_fh-set_stripe...)
Examples and details:
Lustre::Info and lustre-info.pl
---
Lustre::Info provides a Perl-OO interface to lustres procfs information.
(confusing) example code to get the blockdevice of all OSTs:
#
my $l = Lustre::Info-new;
print join(\n, map( { $l-get_ost($_)-get_name.:
.$l-get_ost($_)-get_blockdevice } \
@{$l-get_ost_list}), '' ) if $l-is_ost;
#
..output:
$ perl test.pl
lustre1-OST001e: /dev/md17
lustre1-OST0016: /dev/md15
lustre1-OST000e: /dev/md13
lustre1-OST0006: /dev/md11
The module also includes a script called 'lustre-info.pl' that can
be used to gather some live performance statistics:
Use `--ost-stats' to get a quick overview on what's going on:
$ lustre-info.pl --ost-stats
lustre1-OST0006 (@ /dev/md11) : write= 5.594 MB/s, read= 0.000 MB/s,
create= 0.0 R/s, destroy= 0.0 R/s, setattr= 0.0 R/s, preprw= 6.0 R/s
lustre1-OST000e (@ /dev/md13) : write= 3.997 MB/s, read= 0.000 MB/s,
create= 0.0 R/s, destroy= 0.0 R/s, setattr= 0.0 R/s, preprw= 4.0 R/s
lustre1-OST0016 (@ /dev/md15) : write= 5.502 MB/s, read= 0.000 MB/s,
create= 0.0 R/s, destroy= 0.0 R/s, setattr= 0.0 R/s, preprw= 6.0 R/s
lustre1-OST001e (@ /dev/md17) : write= 5.905 MB/s, read= 0.000 MB/s,
create= 0.0 R/s, destroy= 0.0 R/s, setattr= 0.0 R/s, preprw= 6.7 R/s
You can also get client-ost details via `--monitor=MODE'
$ lustre-info.pl --monitor=ost --as-list # this will only show clients where
read+write = 1MB/s
client nid | lustre1-OST0006| lustre1-OST000e| lustre1-OST0016
| lustre1-OST001e| +++ TOTALS +++ (MB/s)
10.201.46...@o2ib | r= 0.0, w= 0.0 | r= 0.0, w= 0.0 | r= 0.0, w=
0.0 | r= 0.0, w= 1.1 | read= 0.0, write= 1.1
10.201.47...@o2ib | r= 0.0, w= 0.0 | r= 0.0, w= 1.2 | r= 0.0, w=
2.0 | r= 0.0, w= 0.0 | read= 0.0, write= 3.2
There are many more options, checkout `lustre-info.pl --help' for details!
Lustre::LFS::Dir and Lustre::LFS::File
---
This two packages behave like IO::File and IO::Dir but both of
them add some lustre-only features to the returned filehandle.
Quick example:
my $fh = Lustre::LFS::File; # $fh is a normal IO::File-like FH
$fh-open( test) or die;
print $fh Foo Bar!\n;
my $stripe_info = $fh-get_stripe or die Not on a lustre filesystem?!\n;
Keep in mind that both Lustre modules are far from being complete:
Lustre::Info really needs some MDT support and Lustre::LFS is just a
wrapper for /usr/bin/lfs: An XS-Version would be much better.
But i'd love to hear some feedback if someone decides to play around
with this modules + lustre-info.pl :-)
Cheers,
Adrian
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