Migrating Data form one San to another

This is not an offical post, just to keep what I did, I hope I can add more later on!

I used both these weblogs and came up with a little bit better solution
to recreate the old VG on old san:

http://saharageeks.com/2011/07/26/migrated-data-using-lvm-mirroring/

http://codeworks.gnomedia.com/archives/2005/general/lvm_recovery/

http://storagemeat.blogspot.com/2010/07/migrating-volumes-with-linux-lvm.html

Old VG: /dev/loop0 and /dev/loop1
New VG: only /dev/loop5

888 dd if=/dev/zero of=LUN01 bs=4096 count=250000
889 dd if=/dev/zero of=LUN02 bs=4096 count=250000
890 dd if=/dev/zero of=LUN03 bs=4096 count=2500000

897 losetup /dev/loop0 LUN01
898 losetup /dev/loop1 LUN02
901 losetup /dev/loop5 LUN03

1031 pvcreate /dev/loop5
1032 pvcreate /dev/loop0
1033 pvcreate /dev/loop1

1034 vgcreate TestEMC /dev/loop0 /dev/loop1
1035 lvcreate -L 800M -n testLV01 TestEMC
1037 lvcreate -L 1100M -n testLV02 TestEMC
1041 lvcreate -l 13 -n testLV03 TestEMC
1042 vgs

1054 mkfs.ext2 /dev/mapper/TestEMC-testLV01
1055 mkfs.ext2 /dev/mapper/TestEMC-testLV02
1057 mkfs.ext2 /dev/mapper/TestEMC-testLV03

1059 mount /dev/mapper/TestEMC-testLV01 test1
1060 mount /dev/mapper/TestEMC-testLV02 test2
1066 mount /dev/mapper/TestEMC-testLV03 test3

1067 lvs
1068 vgs
1069 lvs -m
1070 lvdisplay -m

1071 cp /etc/lvm/backup/TestEMC .

1073 vgextend TestEMC /dev/loop5

1074 vgs

1075 lvconvert -m1 --corelog TestEMC/testLV01 /dev/loop5
1092 lvconvert -m1 --corelog TestEMC/testLV02 /dev/loop5
1093 lvconvert -m1 --corelog TestEMC/testLV03 /dev/loop5

1094 umount test1
1096 umount test2
1097 umount test3

1098 lvconvert -m0 TestEMC/testLV01 /dev/loop0 /dev/loop1
1099 lvconvert -m0 TestEMC/testLV02 /dev/loop0 /dev/loop1
1100 lvconvert -m0 TestEMC/testLV03 /dev/loop0 /dev/loop1

1101 vgsplit TestEMC OldTestEMC /dev/loop0 /dev/loop1
1102 cp /etc/lvm/backup/TestEMC ./OldTestEMC

1110 vi OldTestEMC

(I made a copy of TestEMC, named it OldTestEMC, and I changed the UUID for LVs and VG and the name of VG in OldTestEMC)

1111 vgcfgrestore -f OldTestEMC OldTestEMC
1112 vgs
1113 lvs -v

1118 mkdir test1old
1119 mkdir test2old
1120 mkdir test3old

1121 vgs

1125 vgchange -ay OldTestEMC

1126 mount /dev/mapper/OldTestEMC-testLV01 test1
1127 mount /dev/mapper/OldTestEMC-testLV02 test2
1128 mount /dev/mapper/OldTestEMC-testLV03 test3
1137 umount test1
1138 umount test2
1139 umount test3

1140 fsck /dev/mapper/OldTestEMC-testLV01
1141 fsck /dev/mapper/OldTestEMC-testLV03
1142 fsck /dev/mapper/OldTestEMC-testLV02

1143 mount /dev/mapper/OldTestEMC-testLV03 test3
1144 mount /dev/mapper/OldTestEMC-testLV03 test2
1145 mount /dev/mapper/OldTestEMC-testLV03 test1

Clean UP and destory the lab!

1155 lvremove TestEMC
1156 lvremove OldTestEMC (it will remove LVs one by one in this VG)

1159 umount test1
1160 umount /test/test1
1161 umount /test/test2
1162 umount /test/test3
1163 mount | grep test
1164 lvremove OldTestEMC
1178 vgchange -a n NetApp
1187 umount /dev/mapper/NetApp-orappl
1188 fuser /dev/mapper/NetApp-orappl
1190 umount /dev/mapper/NetApp-orappl
1194 losetup -d /dev/loop0
1195 losetup -d /dev/loop1
1196 losetup -d /dev/loop2
1197 losetup -d /dev/loop3
1198 losetup -d /dev/loop4
1199 losetup -d /dev/loop5
1200 losetup -a