中国黑防联盟

Linux删除LVM中PV物理卷的技巧

中国黑防联盟 电脑使用教程 2024-04-28 22:31:42 0 0
  LVM通常用于装备大量磁盘的系统,具有良好的可伸缩性,可对卷组、逻辑卷的大小进行调整,今天小编要给大家介绍的是Linux如何删除LVM中的PV物理卷(硬盘或分区),一起来学习下吧。  Linux删除LVM中PV物理卷的技巧   一、由于硬盘或者分区的操作方式其实都一样,所以我这里就以分区为例。   二、/home分区2.6G,由如下pv组成:   /dev/sda5 100M   /dev/sda6 200M   /dev/sda7 300M   /dev/sda8 400M   /dev/sda9 500M   /dev/sda10 600M   /dev/sda11 500M   很碎对吧?^_^因为测试。   三、随机写了一堆文件进去,用量达到了2G,空闲500M   四、准备将sda6这个200M的PV卸掉(卸掉的容量必须小于空闲容量)   好了开始具体操作了。   卸载分区(缩小操作必须卸载才能进行):   umount /home   缩小分区:   e2fsck -f /dev/liuhg_disk/home   resize2fs /dev/liuhg_disk/home 2200M   首先将分区缩小到2200M这是为了给sda6腾出空间,sda6为200M,而我腾出了400M,因此应该是足够的。   缩小逻辑卷:   lvreduce -L 2200M /dev/liuhg_disk/home   分区缩小了用到的逻辑卷也要随着缩小,并查看PV使用的状态:   pvdisplay -m   显示如下:   --- Physical volume ---   PV Name /dev/sda5   VG Name liuhg_disk   PV Size 103.26 MiB / not usable 3.26 MiB   Allocatable yes (but full)   PE Size 4.00 MiB   Total PE 25   Free PE 0   Allocated PE 25   PV UUID 5lnx52-b4jc-OOfZ-f2QA-ttdQ-DZeD-Ce3rb3   --- Physical Segments ---   Physical extent 0 to 24:   Logical volume /dev/liuhg_disk/home   Logical extents 0 to 24   --- Physical volume ---   PV Name /dev/sda6   VG Name liuhg_disk   PV Size 203.92 MiB / not usable 3.92 MiB   Allocatable yes (but full)   PE Size 4.00 MiB   Total PE 50   Free PE 0 《-----太悲剧了,sda6里写满了数据一点不剩   Allocated PE 50 《-----这50PE的数据要挪走才行,否则数据就丢了,并且存放的地方也必须是连续的至少50PE   PV UUID S2ane6-nlFG-uSNR-35NP-Yxa6-cXRb-r8E8mK   --- Physical Segments ---   Physical extent 0 to 49:   Logical volume /dev/liuhg_disk/home   Logical extents 25 to 74   --- Physical volume ---   PV Name /dev/sda7   VG Name liuhg_disk   PV Size 305.89 MiB / not usable 1.89 MiB   Allocatable yes   PE Size 4.00 MiB   Total PE 76   Free PE 76 《---这个分区有76个空余,因此预计装那50个是不会有问题的   Allocated PE 0   PV UUID 9CFnlx-CAEw-CSul-Rig9-FiCN-zK0a-oGmTEP   --- Physical Segments ---   Physical extent 0 to 75:   FREE   --- Physical volume ---   PV Name /dev/sda8   VG Name liuhg_disk   PV Size 407.87 MiB / not usable 3.87 MiB   Allocatable yes   PE Size 4.00 MiB   Total PE 101   Free PE 60   Allocated PE 41   PV UUID X0I8p0-x2xr-2xLG-QQD4-jbtS-3C4i-xPn4Bl   --- Physical Segments ---   Physical extent 0 to 40:   Logical volume /dev/liuhg_disk/home   Logical extents 471 to 511
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