source/steps/CheckForNewDisks.py

   1 #!/usr/bin/python
   2 #
   3 # Copyright (c) 2003 Intel Corporation
   4 # All rights reserved.
   5 #
   6 # Copyright (c) 2004-2006 The Trustees of Princeton University
   7 # All rights reserved.
   8
   9 import string
  10
  11 import InstallPartitionDisks
  12 from Exceptions import *
  13 import systeminfo
  14 import utils
  15 import os
  16
  17 import ModelOptions
  18
  19
  20 def Run(vars, log):
  21     """
  22     Find any new large block devices we can add to the vservers volume group
  23
  24     Expect the following variables to be set:
  25     SYSIMG_PATH          the path where the system image will be mounted
  26     MINIMUM_DISK_SIZE       any disks smaller than this size, in GB, are not used
  27     NODE_MODEL_OPTIONS   the node's model options
  28
  29     Set the following variables upon successfully running:
  30     ROOT_MOUNTED             the node root file system is mounted
  31     """
  32
  33     log.write("\n\nStep: Checking for unused disks to add to LVM.\n")
  34
  35     # make sure we have the variables we need
  36     try:
  37         SYSIMG_PATH = vars["SYSIMG_PATH"]
  38         if SYSIMG_PATH == "":
  39             raise ValueError("SYSIMG_PATH")
  40
  41         MINIMUM_DISK_SIZE = int(vars["MINIMUM_DISK_SIZE"])
  42
  43         PARTITIONS = vars["PARTITIONS"]
  44         if PARTITIONS == None:
  45             raise ValueError("PARTITIONS")
  46
  47         NODE_MODEL_OPTIONS = vars["NODE_MODEL_OPTIONS"]
  48     except KeyError as var:
  49         raise BootManagerException("Missing variable in vars: {}\n".format(var))
  50     except ValueError as var:
  51         raise BootManagerException("Variable in vars, shouldn't be: {}\n".format(var))
  52
  53     all_devices = systeminfo.get_block_device_list(vars, log)
  54
  55     # will contain the new devices to add to the volume group
  56     new_devices = []
  57
  58     # total amount of new space in gb
  59     extended_gb_size = 0
  60
  61     for device in all_devices.keys():
  62
  63         (major,minor,blocks,gb_size,readonly) = all_devices[device]
  64
  65         if device[:14] == "/dev/planetlab":
  66             log.write("Skipping device {} in volume group.\n".format(device))
  67             continue
  68
  69         if readonly:
  70             log.write("Skipping read only device {}\n".format(device))
  71             continue
  72
  73         if gb_size < MINIMUM_DISK_SIZE:
  74             log.write("Skipping too small device {} ({:4.2f}) Gb\n"\
  75                       .format(device, gb_size))
  76             continue
  77
  78         log.write("Checking device {} to see if it is part " \
  79                    "of the volume group.\n".format(device))
  80
  81         # this is the lvm partition, if it exists on that device
  82         lvm_partition = InstallPartitionDisks.get_partition_path_from_device(device, vars, log)
  83         cmd = "pvdisplay {} | grep -q 'planetlab'".format(lvm_partition)
  84         already_added = utils.sysexec_noerr(cmd, log, shell=True)
  85
  86         if already_added:
  87             log.write("It appears {} is part of the volume group, continuing.\n"\
  88                       .format(device))
  89             continue
  90
  91         # just to be extra paranoid, ignore the device if it already has
  92         # an lvm partition on it (new disks won't have this, and that is
  93         # what this code is for, so it should be ok).
  94         cmd = "parted --script --list {} | grep -q lvm$".format(device)
  95         has_lvm = utils.sysexec_noerr(cmd, log)
  96         if has_lvm:
  97             log.write("It appears {} has lvm already setup on it.\n".format(device))
  98             paranoid = False
  99             if paranoid:
 100                 log.write("Too paranoid to add {} to vservers lvm.\n".format(device))
 101                 continue
 102
 103         if not InstallPartitionDisks.single_partition_device(device, vars, log):
 104             log.write("Unable to partition {}, not using it.\n".format(device))
 105             continue
 106
 107         log.write("Successfully partitioned {}\n".format(device))
 108
 109         if NODE_MODEL_OPTIONS & ModelOptions.RAWDISK:
 110             log.write("Running on a raw disk node, not using it.\n")
 111             continue
 112
 113         part_path = InstallPartitionDisks.get_partition_path_from_device(device,
 114                                                                          vars, log)
 115
 116         log.write("Attempting to add {} to the volume group\n".format(device))
 117
 118         if not InstallPartitionDisks.create_lvm_physical_volume(part_path,
 119                                                                  vars, log):
 120             log.write("Unable to create lvm physical volume {}, not using it.\n"\
 121                       .format(part_path))
 122             continue
 123
 124         log.write("Adding {} to list of devices to add to "
 125                    "planetlab volume group.\n".format(device))
 126
 127         extended_gb_size = extended_gb_size + gb_size
 128         new_devices.append(part_path)
 129
 130
 131     if len(new_devices) > 0:
 132
 133         log.write("Extending planetlab volume group.\n")
 134
 135         log.write("Unmounting disks.\n")
 136         try:
 137             # backwards compat, though, we should never hit this case post PL 3.2
 138             os.stat("{}/rcfs/taskclass".format(SYSIMG_PATH))
 139             utils.sysexec_chroot_noerr(SYSIMG_PATH, "umount /rcfs", log)
 140         except OSError as e:
 141             pass
 142
 143         # umount in order to extend disk size
 144         utils.sysexec_noerr("umount {}/proc".format(SYSIMG_PATH), log)
 145         utils.sysexec_noerr("umount {}/vservers".format(SYSIMG_PATH), log)
 146         utils.sysexec_noerr("umount {}".format(SYSIMG_PATH), log)
 147         utils.sysexec("vgchange -an", log)
 148
 149         vars['ROOT_MOUNTED'] = 0
 150
 151         while True:
 152             cmd = "vgextend planetlab {}".format(" ".join(new_devices))
 153             if not utils.sysexec_noerr(cmd, log):
 154                 log.write("Failed to add physical volumes {} to "\
 155                            "volume group, continuing.\n".format(" ".join(new_devices)))
 156                 res = 1
 157                 break
 158
 159             # now, get the number of unused extents, and extend the vserver
 160             # logical volume by that much.
 161             remaining_extents = \
 162                InstallPartitionDisks.get_remaining_extents_on_vg(vars, log)
 163
 164             log.write("Extending vservers logical volume.\n")
 165             utils.sysexec("vgchange -ay", log)
 166             cmd = "lvextend -l +{} {}".format(remaining_extents, PARTITIONS["vservers"])
 167             if not utils.sysexec_noerr(cmd, log):
 168                 log.write("Failed to extend vservers logical volume, continuing\n")
 169                 res = 1
 170                 break
 171
 172             log.write("making the ext filesystem match new logical volume size.\n")
 173
 174             vars['ROOT_MOUNTED'] = 1
 175             cmd = "mount {} {}".format(PARTITIONS["root"], SYSIMG_PATH)
 176             utils.sysexec_noerr(cmd, log)
 177             cmd = "mount {} {}/vservers".format(PARTITIONS["vservers"], SYSIMG_PATH)
 178             utils.sysexec_noerr(cmd, log)
 179             cmd = "resize2fs {}".format(PARTITIONS["vservers"])
 180             resize = utils.sysexec_noerr(cmd,log)
 181             utils.sysexec_noerr("umount {}/vservers".format(SYSIMG_PATH), log)
 182             utils.sysexec_noerr("umount {}".format(SYSIMG_PATH), log)
 183             vars['ROOT_MOUNTED'] = 0
 184
 185             utils.sysexec("vgchange -an", log)
 186
 187             if not resize:
 188                 log.write("Failed to resize vservers partition, continuing.\n")
 189                 res = 1
 190                 break
 191             else:
 192                 log.write("Extended vservers partition by {:4.2f} Gb\n"\
 193                           .format(extended_gb_size))
 194                 res = 1
 195                 break
 196
 197     else:
 198         log.write("No new disk devices to add to volume group.\n")
 199         res = 1
 200
 201     return res