[2239] | 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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