情況介紹： 壹、由於硬盤或者分區的操作方式其實都壹樣，所以我這裏就以分區為例。 二、/home分區2.6G，由如下pv組成： /dev/sda5100M /dev/sda6200M /dev/sda7300M /dev/sda8400M /dev/sda9500M /dev/sda10600M /dev/sda11500M 很碎對吧?^_^因為測試。 三、隨機寫了壹堆文件進去，用量達到了2G，空閑500M 四、準備將sda6這個200M的PV卸掉(卸掉的容量必須小於空閑容量) 好了開始具體操作了。 卸載分區(縮小操作必須卸載才能進行)： umount/home 縮小分區： e2fsck-f/dev/liuhg_disk/home resize2fs/dev/liuhg_disk/home2200M 首先將分區縮小到2200M這是為了給sda6騰出空間，sda6為200M，而我騰出了400M，因此應該是足夠的。 縮小邏輯卷： lvreduce-L2200M/dev/liuhg_disk/home 分區縮小了用到的邏輯卷也要隨著縮小，並查看PV使用的狀態： pvdisplay-m 顯示如下： ---Physicalvolume--- PVName/dev/sda5 VGNameliuhg_disk PVSize103.26MiB/notusable3.26MiB Allocatableyes(butfull) PESize4.00MiB TotalPE25 FreePE0 AllocatedPE25 PVUUID5lnx52-b4jc-OOfZ-f2QA-ttdQ-DZeD-Ce3rb3 ---PhysicalSegments--- Physicalextent0to24: Logicalvolume/dev/liuhg_disk/home Logicalextents0to24 ---Physicalvolume--- PVName/dev/sda6 VGNameliuhg_disk PVSize203.92MiB/notusable3.92MiB Allocatableyes(butfull) PESize4.00MiB TotalPE50 FreePE0<-----太悲劇了，sda6裏寫滿了數據壹點不剩 AllocatedPE50<-----這50PE的數據要挪走才行，否則數據就丟了，並且存放的地方也必須是連續的至少50PE PVUUIDS2ane6-nlFG-uSNR-35NP-Yxa6-cXRb-r8E8mK ---PhysicalSegments--- Physicalextent0to49: Logicalvolume/dev/liuhg_disk/home Logicalextents25to74 ---Physicalvolume--- PVName/dev/sda7 VGNameliuhg_disk PVSize305.89MiB/notusable1.89MiB Allocatableyes PESize4.00MiB TotalPE76 FreePE76<---這個分區有76個空余，因此預計裝那50個是不會有問題的 AllocatedPE0 PVUUID9CFnlx-CAEw-CSul-Rig9-FiCN-zK0a-oGmTEP ---PhysicalSegments--- Physicalextent0to75: FREE ---Physicalvolume--- PVName/dev/sda8 VGNameliuhg_disk PVSize407.87MiB/notusable3.87MiB Allocatableyes PESize4.00MiB TotalPE101 FreePE60 AllocatedPE41 PVUUIDX0I8p0-x2xr-2xLG-QQD4-jbtS-3C4i-xPn4Bl ---PhysicalSegments--- Physicalextent0to40: Logicalvolume/dev/liuhg_disk/home Logicalextents471to511 Physicalextent41to100: FREE ---Physicalvolume--- PVName/dev/sda9 VGNameliuhg_disk PVSize509.84MiB/notusable1.84MiB Allocatableyes(butfull) PESize4.00MiB TotalPE127 FreePE0 AllocatedPE127 PVUUIDavJQaA-oMKt-NEoJ-ojBK-2Csc-1dca-1mh6Ue ---PhysicalSegments--- Physicalextent0to126: Logicalvolume/dev/liuhg_disk/home Logicalextents225to351 ---Physicalvolume--- PVName/dev/sda10 VGNameliuhg_disk PVSize603.98MiB/notusable3.98MiB Allocatableyes(butfull) PESize4.00MiB TotalPE150 FreePE0 AllocatedPE150 PVUUIDJlMIAF-A49n-M6HA-ZLXf-d8nS-pfZr-YeQsKT ---PhysicalSegments--- Physicalextent0to149: Logicalvolume/dev/liuhg_disk/home Logicalextents75to224 ---Physicalvolume--- PVName/dev/sda11 VGNameliuhg_disk PVSize478.47MiB/notusable2.47MiB Allocatableyes(butfull) PESize4.00MiB TotalPE119 FreePE0 AllocatedPE119 PVUUIDxnHJNA-tDVx-dryX-KM1x-g96Y-sptI-9iUOcU ---PhysicalSegments--- Physicalextent0to118: Logicalvolume/dev/liuhg_disk/home Logicalextents352to470 將sda6設置為離線狀態： pvchange-xn/dev/sda6 使用pvdisplay-m 顯示如下： …… ---Physicalvolume--- PVName/dev/sda6 VGNameliuhg_disk PVSize203.92MiB/notusable3.92MiB AllocatableNO<-----表示已經關閉了該PV PESize4.00MiB TotalPE50 FreePE0 AllocatedPE50 PVUUIDS2ane6-nlFG-uSNR-35NP-Yxa6-cXRb-r8E8mK …… 將sda6的數據移走： pvmove-i1/dev/sda6 -i1是每1秒鐘報告壹次數據遷移的進度。 [root@liuhg/]#pvmove-i1/dev/sda6 /dev/sda6:Moved:38.0% /dev/sda6:Moved:84.0% /dev/sda6:Moved:100.0% 重新用pvdisplay-m 顯示如下： …… ---Physicalvolume--- PVName/dev/sda6 VGNameliuhg_disk PVSize203.92MiB/notusable3.92MiB AllocatableNO PESize4.00MiB TotalPE50 FreePE50<----顯示完全空閑和TotalPE數壹致 AllocatedPE0 PVUUIDS2ane6-nlFG-uSNR-35NP-Yxa6-cXRb-r8E8mK …… 從卷組裏把sda6刪除: [root@liuhg/]#vgreduceliuhg_disk/dev/sda6 Removed"/dev/sda6"fromvolumegroup"liuhg_disk" pvdisplay-m再看看吧： ---NEWPhysicalvolume---<-----還告訴妳這是壹個新的PV^_^ PVName/dev/sda6 VGName<-----空了 PVSize203.92MiB AllocatableNO PESize0 TotalPE0 FreePE0 AllocatedPE0 PVUUIDS2ane6-nlFG-uSNR-35NP-Yxa6-cXRb-r8E8mK 到此vgdisplay-v能看到已經沒有了/dev/sda6了。重新掛載/home [root@liuhg/]#mount/dev/liuhg_disk/home/home [root@liuhg/]#df-h FilesystemSizeUsedAvailUse%Mountedon /dev/sda12.0G546M1.3G30%/ tmpfs504M0504M0%/dev/shm /dev/mapper/liuhg_disk-home 2.2G1.8G42M98%/home 進去看看數據，壹個都沒丟。
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