[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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[2240] | 5 | DISK=/dev/mapper/36090a028407d6e2b2589a45cdb971489 |
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| 6 | HALFSIZETiB=5.23 |
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[2239] | 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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[2272] | 11 | METADATASIZE=8128k |
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[2239] | 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(($HALFSIZETiB + 0.01) * 1024 * 1024 * 1024 * 2)") |
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[2253] | 18 | dmlen=$(python -c "print int(($HALFSIZETiB - 0.03) * 1024 * 1024 * 1024 * 2)") |
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| 19 | #Foreach host: |
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[2239] | 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 $TMPDEV |
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| 28 | |
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| 29 | # - pvmove all the LVs to the temporary PV |
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| 30 | |
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[2266] | 31 | yamlkeys () { |
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| 32 | python -c 'if 1: |
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| 33 | import yaml, sys |
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| 34 | mm = yaml.load(sys.stdin.read()) |
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| 35 | for m in sorted(mm.iterkeys()): print m' |
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| 36 | } |
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| 37 | |
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| 38 | lvsleft () { |
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| 39 | lvs -o name,devices xenvg \ |
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| 40 | | perl -lane "print \$F[0] if (\$F[1] =~ m|$DISK|)" |
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| 41 | } |
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| 42 | |
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| 43 | vmstolvs () { |
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| 44 | perl -pe 's/^/d_/;s/$/_hda/' |
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| 45 | } |
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| 46 | |
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| 47 | totalsize () { |
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| 48 | # handy for estimating time; output in GiB; pipe in a list of LVs |
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| 49 | perl -pe 's.^.xenvg/.' \ |
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| 50 | | xargs lvs -o size --units=g \ |
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| 51 | | perl -lne '$total += $_; END { print $total; }' |
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| 52 | } |
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| 53 | |
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[2239] | 54 | movelv () { |
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[2268] | 55 | echo pvmoving $VG/$1... |
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| 56 | pvmove -i 10 -n $VG/$1 $2 |
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[2239] | 57 | } |
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| 58 | |
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[2266] | 59 | ssh root@xvm remctl remote web listvms \ |
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[2268] | 60 | | yamlkeys \ |
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[2266] | 61 | > runningvms |
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| 62 | LVM_SYSTEM_DIR=/root/lvm lvsleft \ |
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| 63 | | grep '^d_.*_hda$' \ |
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| 64 | | grep -v -xf <(vmstolvs <runningvms) \ |
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| 65 | > offvmlvs |
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| 66 | for lv in $(offvmlvs); do |
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[2268] | 67 | LVM_SYSTEM_DIR=/root/lvm movelv $lv $DISK |
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[2266] | 68 | done |
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[2239] | 69 | #FOREACH host: |
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[2268] | 70 | for lv in $(invirt-listvms | yamlkeys | vmstolvs \ |
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| 71 | | grep -xf <(LVM_SYSTEM_DIR=/root/lvm lvsleft)); do |
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| 72 | LVM_SYSTEM_DIR=/root/lvm movelv $lv $DISK |
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[2239] | 73 | done |
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| 74 | #done |
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| 75 | |
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[2266] | 76 | ssh root@xvm remctl remote web listvms \ |
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| 77 | | perl -lne 'print if (s/^ cdrom: //)' \ |
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| 78 | > usedcdroms |
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| 79 | LVM_SYSTEM_DIR=/root/lvm lvsleft \ |
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| 80 | | grep ^image_ \ |
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| 81 | | grep -v -xf <(perl -pe "s|/dev/$VG/||" usedcdroms) \ |
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| 82 | > offcdlvs |
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| 83 | for lv in $(offcdlvs); do |
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[2268] | 84 | LVM_SYSTEM_DIR=/root/lvm movelv $lv $DISK |
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[2266] | 85 | done |
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[2239] | 86 | |
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[2266] | 87 | # deal with $(cat usedcdroms) |
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| 88 | # deal with s_* LVs |
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| 89 | # deal with any remaining $(lvsleft) |
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[2239] | 90 | |
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[2266] | 91 | [ -z $(lvsleft) ] |
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[2239] | 92 | |
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[2266] | 93 | |
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[2239] | 94 | # - pvremove the old PV |
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[2272] | 95 | LVM_SYSTEM_DIR=lvm vgreduce $VG $DISK |
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| 96 | dmsetup create $TMPDM2 --table "0 $((2 * 1024 * 20)) linear $DISK 0" |
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| 97 | pvremove $TMPDEV2 |
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[2239] | 98 | |
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| 99 | # - pvcreate a new PV in the old space, |
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| 100 | # with --setphysicalvolumesize <half size> |
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| 101 | # and with --metadatasize <huge> (the point of this exercise) |
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| 102 | shortsize=$(python -c "print $HALFSIZETiB - 0.01")t |
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| 103 | pvcreate $TMPDEV2 --setphysicalvolumesize $shortsize --metadatasize $METADATASIZE |
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| 104 | dmsetup remove $TMPDM2 |
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| 105 | pvscan |
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[2272] | 106 | LVM_SYSTEM_DIR=lvm vgextend $VG $DISK |
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[2239] | 107 | |
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| 108 | # - pvmove all the LVs back |
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| 109 | |
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| 110 | #FOREACH host: |
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| 111 | for lv in $(lvs -o lv_name --noheadings $VG); do |
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| 112 | movelv $VG/$lv $TMPDEV |
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| 113 | done |
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| 114 | #done |
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| 115 | |
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| 116 | # hopefully empty: |
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| 117 | lvs $VG -o lv_name,devices | grep $TMPDEV |
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| 118 | # if not, do some more movelv |
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| 119 | |
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| 120 | # - pvremove the temporary PV |
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| 121 | vgreduce $VG $TMPDEV |
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| 122 | pvremove $TMPDEV |
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| 123 | dmsetup remove $TMPDM |
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| 124 | |
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| 125 | # - pvresize the new PV to use the whole space |
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| 126 | pvresize $DISK |
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