CentOS 6.4 以降の論理ボリュームのシンプロビジョニング
CentOS 6.4 (RHEL 6.4) 以降(CentOS 7はもちろん)は論理ボリュームのシンプロビジョニングが可能になっていた。
実際の運用で使用するかどうかはともかく、大きなボリュームを使用する検証作業を行ううえではとても役に立つ。
# pvcreate /dev/sde Physical volume "/dev/sde" successfully created
# vgcreate thinpoolvg /dev/sde Volume group "thinpoolvg" successfully created
# lvcreate -L 10G -T --thinpool pool thinpoolvg Logical volume "pool" created # lvdisplay thinpoolvg/pool --- Logical volume --- LV Name pool VG Name thinpoolvg LV UUID FNWrpA-Pwi5-uQ1G-ssFm-2QIl-q0M3-V1jKXj LV Write Access read/write LV Creation host, time garnet-vm01, 2015-03-03 09:51:47 +0900 LV Pool transaction ID 0 LV Pool metadata pool_tmeta LV Pool data pool_tdata LV Pool chunk size 64.00 KiB LV Zero new blocks yes LV Status available # open 0 LV Size 10.00 GiB Allocated pool data 0.00% Allocated metadata 0.62% Current LE 2560 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:6
# lvcreate -T thinpoolvg/pool -V 50G -n volume50g Logical volume "volume50g" created # lvcreate -T thinpoolvg/pool -V 100G -n volume100g Logical volume "volume100g" created # lvdisplay thinpoolvg/volume50g --- Logical volume --- LV Path /dev/thinpoolvg/volume50g LV Name volume50g VG Name thinpoolvg LV UUID M99pkt-QnoE-TuPi-wa6M-yyax-M5yU-XP10Px LV Write Access read/write LV Creation host, time garnet-vm01, 2015-03-03 09:53:54 +0900 LV Pool name pool LV Status available # open 0 LV Size 50.00 GiB Mapped size 0.00% Current LE 12800 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:7 # lvdisplay thinpoolvg/volume100g --- Logical volume --- LV Path /dev/thinpoolvg/volume100g LV Name volume100g VG Name thinpoolvg LV UUID Vu7efq-DuRG-Vw1m-fA0B-g9iY-CU6O-CqMjop LV Write Access read/write LV Creation host, time garnet-vm01, 2015-03-03 10:32:36 +0900 LV Pool name pool LV Status available # open 0 LV Size 100.00 GiB Mapped size 0.00% Current LE 25600 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:8
