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Re: [linux-lvm] dynamic lvm snapshots (auto-resize)



Ray, 

Thanks so much for your answer. You said the feature is being "worked on". I see some work related to thin provisioning "pools" in the latest LVM code. Is this the work you are referring to? If so do you know anything about it (maybe just a paragraph about how it works)? This has peaked my interest and I look forward to what LVM has to offer in the future.

Have a good day!

Dusty 


----- Original Message -----
From: Ray Morris <support bettercgi com>
To: linux-lvm redhat com
Cc: Dusty Mabe <dustymabe yahoo com>
Sent: Thursday, October 13, 2011 2:25 PM
Subject: Re: [linux-lvm] dynamic lvm snapshots (auto-resize)

I think that's being worked on / beta. Until it's ready, we implemented
it in a daemon that is 49 lines of Perl. This particular implementation 
is set to match our environment but you can modify it to your needs:

#!/usr/bin/perl

use Getopt::Long;
use lib 'lib';
use Linux::LVM;

my $lvname;
my $usage = "usage: $0 --lvname lvname\n";
die $usage unless ( GetOptions ( "lvname=s" => \$lvname ) );
die $usage unless ($lvname);

my $ppid = getppid();
while ( -e "/proc/$ppid") {
  &check_snaps($lvname);
  sleep(60);
}

sub check_snaps {
  my $lvname = shift();
  for ($snapnum = 2; $snapnum >= 0; $snapnum--) {
    if (-e "/dev/clones/${lvname}_snap${snapnum}") {
      my %lv = get_lv_info("/dev/clones/${lvname}_snap${snapnum}");
      next unless ($lv{'lv_name'});
      unless ($lv{'allocated_to_snapshot'}) {
          system('lvremove', '-f', "clones/${lvname}_snap${snapnum}");
          next;
      }
      if ($lv{'allocated_to_snapshot'} > 80) {
          print "live extending ${lvname}_snap${snapnum}\n";
          system('lvextend', '-f', '-l', '+20%LV', "clones/${lvname}_snap${snapnum}");
      }
    }
  }
}
-- 
Ray Morris
support bettercgi com

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On Thu, 13 Oct 2011 10:28:56 -0700 (PDT)
Dusty Mabe <dustymabe yahoo com> wrote:

> Hi Everyone,
> 
> I am interested to see if there is any support for automatically
> resizing an lvm snapshot when it becomes full or bypasses a certain
> utilization? There has been  at least some interest in this in the
> past as I have found the following post in the mailman archives. 
> 
> http://www.redhat.com/archives/linux-lvm/2007-November/msg00016.html
> 
> 
> Also it looks like HP as performed at least a similar implementation
> of this type of feature in their own product. 
> 
> http://bizsupport1.austin.hp.com/bc/docs/support/SupportManual/c02054539/c02054539.pdf
> 
> 
> 
> Thanks for any Help!!
> 
> Dusty Mabe
> 
> _______________________________________________
> linux-lvm mailing list
> linux-lvm redhat com
> https://www.redhat.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
> 


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