1 | #!/bin/sh |
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2 | exit 1 #Not actually a script. |
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3 | |
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4 | VG=xenvg |
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5 | DISK=/dev/sdb |
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6 | HALFSIZETiB=2.04 |
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7 | TMPDM=tmpfoo |
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8 | TMPDEV=/dev/mapper/$TMPDM |
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9 | TMPDM2=tmpbar |
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10 | TMPDEV2=/dev/mapper/$TMPDM2 |
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11 | METADATASIZE=3.5m |
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12 | |
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13 | # - pvresize the old PV to half the space |
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14 | pvresize --setphysicalvolumesize=${HALFSIZETiB}t $DISK |
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15 | |
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16 | # - dmsetup create a device in the latter half |
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17 | dmstart=$(python -c "print int(($HALFSIZETiB + 0.01) * 1024 * 1024 * 1024 * 2)") |
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18 | dmlen=$(python -c "print int(($HALFSIZETiB - 0.02) * 1024 * 1024 * 1024 * 2)") |
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19 | #foreach host: |
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20 | dmsetup create $TMPDM --table "0 $dmlen linear $DISK $dmstart" |
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21 | #done |
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22 | |
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23 | # - pvcreate a temporary PV on the new device |
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24 | pvcreate $TMPDEV |
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25 | |
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26 | # - vgextend with the temporary PV |
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27 | vgextend $VG $TMPDEV |
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28 | |
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29 | # - pvmove all the LVs to the temporary PV |
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30 | # (something like |
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31 | # for lv in $(LVs for running VMs on this host); do |
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32 | # #some lvchange -a commands |
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33 | # pvmove -n $lv <oldpv> <newpv> |
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34 | # #possibly more lvchange -a to restore old state |
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35 | # done) |
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36 | |
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37 | movelv () { |
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38 | echo pvmoving $1... |
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39 | lvchange -an $1 |
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40 | pvmove -i 10 -n $1 $2 |
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41 | } |
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42 | |
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43 | #touch /etc/invirt/nocreate |
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44 | #FOREACH host: |
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45 | #machines=$(invirt-listvms | perl -lne 'print if s/^([^ ]*):.*/$1/') |
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46 | #lvs=$(echo $machines | perl -lpe "s|^|$VG/d_|; s|$|_hda|") |
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47 | for lv in $(lvs -o lv_name --noheadings $VG); do |
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48 | movelv $VG/$lv $DISK |
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49 | done |
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50 | #done |
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51 | |
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52 | # hopefully empty: |
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53 | lvs $VG -o lv_name,devices | grep $DISK |
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54 | # if not, do some more movelv |
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55 | |
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56 | # This is possible if some LVs were used on more than one host during |
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57 | # migration. |
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58 | |
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59 | |
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60 | # - pvremove the old PV |
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61 | vgreduce $VG $DISK |
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62 | pvremove $DISK |
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63 | |
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64 | # - pvcreate a new PV in the old space, |
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65 | # with --setphysicalvolumesize <half size> |
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66 | # and with --metadatasize <huge> (the point of this exercise) |
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67 | shortsize=$(python -c "print $HALFSIZETiB - 0.01")t |
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68 | dmsetup create $TMPDM2 --table "0 $((2 * 1024 * 4)) linear $DISK 0" |
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69 | pvcreate $TMPDEV2 --setphysicalvolumesize $shortsize --metadatasize $METADATASIZE |
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70 | dmsetup remove $TMPDM2 |
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71 | pvscan |
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72 | vgextend $VG $DISK |
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73 | |
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74 | # - pvmove all the LVs back |
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75 | |
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76 | #FOREACH host: |
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77 | for lv in $(lvs -o lv_name --noheadings $VG); do |
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78 | movelv $VG/$lv $TMPDEV |
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79 | done |
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80 | #done |
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81 | |
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82 | # hopefully empty: |
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83 | lvs $VG -o lv_name,devices | grep $TMPDEV |
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84 | # if not, do some more movelv |
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85 | |
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86 | # - pvremove the temporary PV |
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87 | vgreduce $VG $TMPDEV |
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88 | pvremove $TMPDEV |
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89 | dmsetup remove $TMPDM |
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90 | |
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91 | # - pvresize the new PV to use the whole space |
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92 | pvresize $DISK |
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