Easy Python: display LVM details in XML

2010/08/15 by admin in Python, Scripts | 1 Comment

If you need to work with LVM in your scripts but haven’t found a good method to access details about Logical Volume Groups, here’s a simple Python script that will print the details about any volumes on your system. This could be useful for writing a partition check script for your MySQL data directory (if you’re not using a standard monitoring system like Nagios). 

import sys
import os
import commands
import subprocess
import select

def lvm():
    print ""
    LVM_PATH = "/sbin"
    LVM_BIN = os.path.join(LVM_PATH, 'lvm')
    argv = list()
    argv.append(LVM_BIN)
    argv.append("lvs")
    argv.append("--nosuffix")
    argv.append("--noheadings")
    argv.append("--units")
    argv.append("b")
    argv.append("--separator")
    argv.append(";")
    argv.append("-o")
    argv.append("lv_name,vg_name,lv_size")

    process = subprocess.Popen(argv, stdout=subprocess.PIPE)
    output = ""
    out = process.stdout.readline()
    output += out
    lines = output.splitlines()
    for line in lines:
        line = line.strip()
        words = line.split(";")

        lvname = words[0].strip()
        vgname = words[1].strip()
        lv_size = int(words[2])
        print '''
    %s
    %s
    %s
  '''%(lvname, vgname, lv_size)

    print ""

lvm()
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