快资讯丨44-KVM虚拟化-存储管理和磁盘扩容

此为默认磁盘格式,但并是一种真正的磁盘格式，而是代表虚拟机所使用的原始镜像,它并不存储元数据，因此可作为保证虚拟机兼容性的候选方案。然而，也正因为它不存储元数据，因此不支持某些高级特往，比如快照和压缩等格式简单，容易转换为其他的格式。如果主机文件系统允许，raw 文件可以是预分配（pre-allocated）或稀疏（sparse）。稀疏文件根据需求分配主机磁盘空间，因此它是一种精简配置形式（thin provisioning）。预分配文件的所有空间需要被预先分配，但它比稀疏文件性能好。当对磁盘 I/O 性能要求非常高，而且通常不需要通过网络传输镜像文件时，可以使用 raw文件优点 : 性能好缺点 : 空间占用大,功能较少,生产不推荐使用

qcow2 镜像文件提供许多高级磁盘镜像特征，如快照、压缩及加密。它们可以用来代表通过模板镜像创建的虚拟机。因为只有虚拟机写入的扇区部分才会分配在镜像中，所以 qcow2 文件的网络传输效率较高。RHEL 7.0 及更新版本支持 qcow2 v3 镜像文件格式按需进行分配磁盘空间，不管文件系统是否支持优点 : 空间节约,功能丰富支持快照支持zlib的磁盘压缩支持AES的加密缺点 : 性能较差,生产推荐使用案例：查看不同磁盘文件格式支持选项#raw[root@ubuntu2204 ~]#qemu-img create -f raw -o ?Supported raw options: size= - Virtual disk sizeThe protocol level may support further options.Specify the target filename to include those options.#qcow2[root@ubuntu2204 ~]#qemu-img create -f qcow2 -o ?Supported qcow2 options: backing_file= - File name of a base image backing_fmt= - Image format of the base image cluster_size= - qcow2 cluster size compat= - Compatibility level (v2 [0.10] or v3 [1.1]) compression_type= - Compression method used for image cluster compression data_file= - File name of an external data file data_file_raw= - The external data file must stay valid as a raw image encrypt.cipher-alg= - Name of encryption cipher algorithm encrypt.cipher-mode= - Name of encryption cipher mode encrypt.format= - Encrypt the image, format choices: "aes", "luks" encrypt.hash-alg= - Name of encryption hash algorithm encrypt.iter-time= - Time to spend in PBKDF in milliseconds encrypt.ivgen-alg= - Name of IV generator algorithm encrypt.ivgen-hash-alg= - Name of IV generator hash algorithm encrypt.key-secret= - ID of secret providing qcow AES key or LUKS passphrase encryption= - Encrypt the image with format "aes". (Deprecated in favor of encrypt.format=aes) extended_l2= - Extended L2 tables lazy_refcounts= - Postpone refcount updates preallocation= - Preallocation mode (allowed values: off, metadata, falloc, full) refcount_bits= - Width of a reference count entry in bits size= - Virtual disk sizeThe protocol level may support further options.Specify the target filename to include those options.

[root@ubuntu2204 ~]#qemu-img --help|grep SupportSupported formats: blkdebug blklogwrites blkverify bochs cloop compress copy-before-write copy-on-read dmg file ftp ftps gluster host_cdrom host_device http https iscsi iser luks nbd null-aio null-co nvme parallels preallocate qcow qcow2 qed quorum raw rbd replication ssh throttle vdi vhdx vmdk vpc vvfat

#qemu-img 包括以下子命令check #检查完整性create #创建镜像commit #提交更改compare #比较convert #转换info #获得信息map #映射snapshot #快照管理rebase #在已有的镜像的基础上创建新的镜像resize #调整大小amend #修订镜像格式选项#格式：qemu-img create [-q] [--object objectdef] [-f fmt] [-b backing_file] [-F backing_fmt] [-u] [-o options] filename [size]

#案例1：创建raw格式非稀疏文件[root@ubuntu2204 ~]#dd if=/dev/zero of=/opt/vm2.img bs=1M count=10241024+0 records in1024+0 records out1073741824 bytes (1.1 GB, 1.0 GiB) copied, 6.2694 s, 171 MB/s[root@ubuntu2204 ~]#qemu-img info /opt/vm2.img image: /opt/vm2.imgfile format: rawvirtual size: 1 GiB (1073741824 bytes) --> 显示1Gdisk size: 1 GiB --> 实际占用磁盘1G#案例2：创建raw格式稀疏文件[root@ubuntu2204 ~]#dd if=/dev/zero of=/opt/vm3.img bs=1M count=0 seek=10240+0 records in0+0 records out0 bytes copied, 0.000217691 s, 0.0 kB/s[root@ubuntu2204 ~]#qemu-img info /opt/vm3.img image: /opt/vm3.imgfile format: rawvirtual size: 1 GiB (1073741824 bytes) --> 显示1Gdisk size: 0 B --> 实际占用磁盘1字节#案例3：指定将非稀疏文件复制为稀疏格式文件[root@ubuntu2204 ~]#cp --sparse=always /opt/vm2.img /opt/vm2.img.bk [root@ubuntu2204 ~]#qemu-img info /opt/vm2.imgimage: /opt/vm2.imgfile format: rawvirtual size: 1 GiB (1073741824 bytes)disk size: 1 GiB[root@ubuntu2204 ~]#qemu-img info /opt/vm2.img.bk image: /opt/vm2.img.bkfile format: rawvirtual size: 1 GiB (1073741824 bytes)disk size: 0 B#案例4：指定将稀疏文件复制为非稀疏格式文件[root@ubuntu2204 ~]#cp --sparse=never /opt/vm3.img /opt/vm3.img.bk [root@ubuntu2204 ~]#qemu-img info /opt/vm3.imgimage: /opt/vm3.imgfile format: rawvirtual size: 1 GiB (1073741824 bytes)disk size: 0 B[root@ubuntu2204 ~]#qemu-img info /opt/vm3.img.bk image: /opt/vm3.img.bkfile format: rawvirtual size: 1 GiB (1073741824 bytes)disk size: 1 GiB

#qcow2 格式选项 backing_file #指定后端镜像文件 backing_fmt #设置后端镜像的镜像格式 cluster_size #设置镜像中的簇大小，取值在512到2M之间，默认值为64K preallocation #设置镜像文件空间的预分配模式 encryption #用于设置加密 [root@ubuntu2204 ~]#qemu-img create -f qcow2 /opt/vm1.img 2gFormatting "/opt/vm1.img", fmt=qcow2 cluster_size=65536 extended_l2=off compression_type=zlib size=2147483648 lazy_refcounts=off refcount_bits=16[root@ubuntu2204 ~]#qemu-img info /opt/vm1.img image: /opt/vm1.imgfile format: qcow2virtual size: 2 GiB (2147483648 bytes)disk size: 196 KiBcluster_size: 65536Format specific information: compat: 1.1 compression type: zlib lazy refcounts: false refcount bits: 16 corrupt: false extended l2: false

*对于关机状态的虚拟机磁盘,可以检查文件错误[root@centos8 ~]#virsh listId Name State----------------------------------------------------2 centos8 running[root@centos8 ~]#qemu-img check /var/lib/libvirt/images/centos8.qcow2qemu-img: Could not open "/var/lib/libvirt/images/centos8.qcow2": Failed to getshared "write" lockIs another process using the image [/var/lib/libvirt/images/centos8.qcow2]?[root@centos8 ~]#virsh suspend centos8Domain centos8 suspended[root@centos8 ~]#virsh listId Name State----------------------------------------------------2 centos8 paused[root@centos8 ~]#qemu-img check /var/lib/libvirt/images/centos8.qcow2qemu-img: Could not open "/var/lib/libvirt/images/centos8.qcow2": Failed to getshared "write" lockIs another process using the image [/var/lib/libvirt/images/centos8.qcow2]?[root@centos8 ~]#qemu-img check /var/lib/libvirt/images/centos7.qcow2No errors were found on the image.25572/327680 = 7.80% allocated, 1.44% fragmented, 0.00% compressed clustersImage end offset: 1676869632

只预分配元数据(metadata)，预分配后的磁盘文件属于稀疏映像类型,相当于vmware中的磁盘置备选项: Thin Provision(精简配置)生成的磁盘文件为稀疏格式,实际占用的空间比off策略稍大一些

分配文件的块并标识它们的状态为未初始化，即只分配空间,但不置零(不格式化). 预分配后的虚拟磁盘属于非稀疏映像类型,相对full模式来说，创建虚拟磁盘的速度要快很多,相当于vmware中的磁盘置备选项:厚置备延迟置零生成的磁盘文件实际占用的空间和分配的空间相同大小

分配所有磁盘空间并置零，预分配后的虚拟磁盘属于非稀疏映像类型,创建最慢,相当于vmware中的磁盘置备选项: 厚置备置零生成的磁盘文件实际占用的空间和分配的空间相同大小

#案例1：默认开启默认预分配策略 - 稀疏格式，根据实际需要自动分配磁盘空间[root@ubuntu2204 ~]#qemu-img create -f qcow2 /opt/vm1.img 2gFormatting "/opt/vm1.img", fmt=qcow2 cluster_size=65536 extended_l2=off compression_type=zlib size=2147483648 lazy_refcounts=off refcount_bits=16[root@ubuntu2204 ~]#qemu-img info /opt/vm1.img image: /opt/vm1.imgfile format: qcow2virtual size: 2 GiB (2147483648 bytes)disk size: 196 KiBcluster_size: 65536Format specific information: compat: 1.1 compression type: zlib lazy refcounts: false refcount bits: 16 corrupt: false extended l2: false #案例2：指定off关闭预分配[root@ubuntu2204 ~]#qemu-img create -f qcow2 /opt/vm2.img 1g -o preallocatinotallow=offFormatting "/opt/vm2.img", fmt=qcow2 cluster_size=65536 extended_l2=off preallocation=off compression_type=zlib size=1073741824 lazy_refcounts=off refcount_bits=16[root@ubuntu2204 ~]#qemu-img info /opt/vm2.img image: /opt/vm2.imgfile format: qcow2virtual size: 1 GiB (1073741824 bytes)disk size: 196 KiBcluster_size: 65536Format specific information: compat: 1.1 compression type: zlib lazy refcounts: false refcount bits: 16 corrupt: false extended l2: false#案例3：指定预分配metadata[root@ubuntu2204 ~]#qemu-img create -f qcow2 /opt/vm3.img 1g -o preallocatinotallow=metadataFormatting "/opt/vm3.img", fmt=qcow2 cluster_size=65536 extended_l2=off preallocation=metadata compression_type=zlib size=1073741824 lazy_refcounts=off refcount_bits=16[root@ubuntu2204 ~]#qemu-img info /opt/vm3.img image: /opt/vm3.imgfile format: qcow2virtual size: 1 GiB (1073741824 bytes)disk size: 324 KiBcluster_size: 65536Format specific information: compat: 1.1 compression type: zlib lazy refcounts: false refcount bits: 16 corrupt: false extended l2: false#案例4：指定预分配falloc[root@ubuntu2204 ~]#qemu-img create -f qcow2 /opt/vm4.img 1g -o preallocatinotallow=fallocFormatting "/opt/vm4.img", fmt=qcow2 cluster_size=65536 extended_l2=off preallocation=falloc compression_type=zlib size=1073741824 lazy_refcounts=off refcount_bits=16[root@ubuntu2204 ~]#qemu-img info /opt/vm4.img image: /opt/vm4.imgfile format: qcow2virtual size: 1 GiB (1073741824 bytes)disk size: 1 GiBcluster_size: 65536Format specific information: compat: 1.1 compression type: zlib lazy refcounts: false refcount bits: 16 corrupt: false extended l2: false#文件系统显示大小[root@ubuntu2204 ~]#ll -h /opt/vm*-rw-r--r-- 1 root root 193K Jan 1 17:40 /opt/vm1.img-rw-r--r-- 1 root root 193K Jan 1 18:04 /opt/vm2.img-rw-r--r-- 1 root root 1.1G Jan 1 18:08 /opt/vm3.img-rw-r--r-- 1 root root 1.1G Jan 1 18:08 /opt/vm4.img#查看真实大小[root@ubuntu2204 ~]#du -h /opt/vm*196K /opt/vm1.img196K /opt/vm2.img324K /opt/vm3.img1.1G /opt/vm4.img

#qemu-img 可以将不同格式的虚拟磁盘文件进行格式转化#案例：将vmdk转化为raw 和qcow2格式[root@centos8 ~]#qemu-img info CentOS8.2.vmdkimage: CentOS8.2.vmdkfile format: vmdkvirtual size: 200G (214748364800 bytes)disk size: 1.6Gcluster_size: 65536Format specific information:cid: 2898578192parent cid: 4294967295create type: monolithicSparseextents:[0]:virtual size: 214748364800filename: CentOS8.2.vmdkcluster size: 65536format:#默认转化为raw格式[root@centos8 ~]#qemu-img convert CentOS8.2.vmdk CentOS8.2.img#比较大小[root@centos8 ~]#ll -h CentOS8.2.vmdk CentOS8.2.img-rw-r--r-- 1 root root 1.6G Sep 20 16:00 CentOS8.2.vmdk-rw-r--r-- 1 root root 200G Sep 20 16:10 CentOS8.2.img[root@centos8 ~]#du -h CentOS8.2.vmdk CentOS8.2.img1.6G CentOS8.2.vmdk1.5G CentOS8.2.img[root@centos8 ~]#qemu-img info CentOS8.2.imgimage: CentOS8.2.imgfile format: rawvirtual size: 200G (214748364800 bytes)disk size: 1.4G[root@centos8 ~]#mv CentOS8.2.img /var/lib/libvirt/images/[root@centos8 ~]#virt-install --import --name=centos8-test2 --vcpus=1 --ram=2048--disk bus=scsi,path=/var/lib/libvirt/images/CentOS8.2.img --networknetwork=default --graphics vnc,listen=0.0.0.0 --os-type=Linux --osvariant=centos8 --noautoconsole --boot hd#转化为qcow2格式[root@centos8 ~]#qemu-img convert -f vmdk -O qcow2 CentOS8.2.vmdkCentOS8.2.qcow2#比较大小[root@centos8 ~]#ll -h CentOS8.2.vmdk CentOS8.2.qcow2-rw-r--r-- 1 root root 1.6G Sep 20 16:00 CentOS8.2.vmdk-rw-r--r-- 1 root root 1.6G Sep 20 16:12 CentOS8.2.qcow2[root@centos8 ~]#du -h CentOS8.2.vmdk CentOS8.2.qcow21.6G CentOS8.2.vmdk1.6G CentOS8.2.qcow2[root@centos8 ~]#qemu-img info CentOS8.2.qcow2image: CentOS8.2.qcow2file format: qcow2virtual size: 200G (214748364800 bytes)disk size: 1.5Gcluster_size: 65536Format specific information:compat: 1.1lazy refcounts: falserefcount bits: 16corrupt: false[root@centos8 ~]#mv CentOS8.2.qcow2 /var/lib/libvirt/images/[root@centos8 ~]#virt-install --import --name=centos8-test3 --vcpus=1 --ram=2048--disk bus=scsi,path=/var/lib/libvirt/images/CentOS8.2.qcow2 --networknetwork=default --graphics vnc,listen=0.0.0.0 --os-type=Linux --osvariant=centos8 --noautoconsole --boot hd

#思路：扩展分区-扩容物理卷-扩容逻辑卷组-扩容指定逻辑卷[root@ubuntu2204 ~]#qemu-img info /var/lib/libvirt/images/centos7-mooreyxia.qcow2 image: /var/lib/libvirt/images/centos7-mooreyxia.qcow2file format: qcow2virtual size: 10 GiB (10737418240 bytes)disk size: 1.6 GiBcluster_size: 65536Snapshot list:ID TAG VM SIZE DATE VM CLOCK ICOUNT1 centos7-s1 0 B 2023-01-01 19:01:27 00:00:00.000 0Format specific information: compat: 1.1 compression type: zlib lazy refcounts: true refcount bits: 16 corrupt: false extended l2: false[root@ubuntu2204 ~]#du -sh /var/lib/libvirt/images/centos7-mooreyxia.qcow2 1.6G /var/lib/libvirt/images/centos7-mooreyxia.qcow2#扩容 - 增加10G空间[root@ubuntu2204 ~]#qemu-img info /var/lib/libvirt/images/centos7-mooreyxia.qcow2 image: /var/lib/libvirt/images/centos7-mooreyxia.qcow2file format: qcow2virtual size: 20 GiB (21474836480 bytes)disk size: 1.6 GiBcluster_size: 65536Snapshot list:ID TAG VM SIZE DATE VM CLOCK ICOUNT1 centos7-s1 0 B 2023-01-01 19:01:27 00:00:00.000 0Format specific information: compat: 1.1 compression type: zlib lazy refcounts: true refcount bits: 16 corrupt: false extended l2: false #qemu-img resize 扩展空间后，在虚拟机内还需执行如下操作才能最终扩容[root@localhost ~]# lsblkNAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTsr0 11:0 1 1024M 0 rom vda 252:0 0 20G 0 disk ├─vda1 252:1 0 1G 0 part /boot└─vda2 252:2 0 9G 0 part ├─centos-root 253:0 0 8G 0 lvm / └─centos-swap 253:1 0 1G 0 lvm [SWAP] [root@localhost ~]# df -hFilesystem Size Used Avail Use% Mounted ondevtmpfs 908M 0 908M 0% /devtmpfs 919M 0 919M 0% /dev/shmtmpfs 919M 8.6M 911M 1% /runtmpfs 919M 0 919M 0% /sys/fs/cgroup/dev/mapper/centos-root 8.0G 1.3G 6.8G 16% //dev/vda1 1014M 153M 862M 15% /boottmpfs 184M 0 184M 0% /run/user/0#重新创建/dev/vda2,容量使用所有空间，/dev/vda2扩容到20G[root@localhost ~]# fdisk /dev/vdaWelcome to fdisk (util-linux 2.23.2).Changes will remain in memory only, until you decide to write them.Be careful before using the write command.Command (m for help): mCommand action a toggle a bootable flag b edit bsd disklabel c toggle the dos compatibility flag d delete a partition g create a new empty GPT partition table G create an IRIX (SGI) partition table l list known partition types m print this menu n add a new partition o create a new empty DOS partition table p print the partition table q quit without saving changes s create a new empty Sun disklabel t change a partition"s system id u change display/entry units v verify the partition table w write table to disk and exit x extra functionality (experts only)Command (m for help): pDisk /dev/vda: 21.5 GB, 21474836480 bytes, 41943040 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk label type: dosDisk identifier: 0x000df5df Device Boot Start End Blocks Id System/dev/vda1 * 2048 2099199 1048576 83 Linux/dev/vda2 2099200 20971519 9436160 8e Linux LVMCommand (m for help): dPartition number (1,2, default 2): Partition 2 is deletedCommand (m for help): pDisk /dev/vda: 21.5 GB, 21474836480 bytes, 41943040 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk label type: dosDisk identifier: 0x000df5df Device Boot Start End Blocks Id System/dev/vda1 * 2048 2099199 1048576 83 LinuxCommand (m for help): pDisk /dev/vda: 21.5 GB, 21474836480 bytes, 41943040 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk label type: dosDisk identifier: 0x000df5df Device Boot Start End Blocks Id System/dev/vda1 * 2048 2099199 1048576 83 LinuxCommand (m for help): nPartition type: p primary (1 primary, 0 extended, 3 free) e extendedSelect (default p): Using default response pPartition number (2-4, default 2): First sector (2099200-41943039, default 2099200): Using default value 2099200Last sector, +sectors or +size{K,M,G} (2099200-41943039, default 41943039): Using default value 41943039Partition 2 of type Linux and of size 19 GiB is setCommand (m for help): pDisk /dev/vda: 21.5 GB, 21474836480 bytes, 41943040 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk label type: dosDisk identifier: 0x000df5df Device Boot Start End Blocks Id System/dev/vda1 * 2048 2099199 1048576 83 Linux/dev/vda2 2099200 41943039 19921920 83 LinuxCommand (m for help): tPartition number (1,2, default 2): Hex code (type L to list all codes): 8eChanged type of partition "Linux" to "Linux LVM"Command (m for help): pDisk /dev/vda: 21.5 GB, 21474836480 bytes, 41943040 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk label type: dosDisk identifier: 0x000df5df Device Boot Start End Blocks Id System/dev/vda1 * 2048 2099199 1048576 83 Linux/dev/vda2 2099200 41943039 19921920 8e Linux LVMCommand (m for help): wThe partition table has been altered!Calling ioctl() to re-read partition table.WARNING: Re-reading the partition table failed with error 16: Device or resource busy.The kernel still uses the old table. The new table will be used atthe next reboot or after you run partprobe(8) or kpartx(8)Syncing disks.#同步文件系统，扩展逻辑卷[root@localhost ~]# lsblkNAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTsr0 11:0 1 1024M 0 rom vda 252:0 0 20G 0 disk ├─vda1 252:1 0 1G 0 part /boot└─vda2 252:2 0 19G 0 part ├─centos-root 253:0 0 8G 0 lvm / └─centos-swap 253:1 0 1G 0 lvm [SWAP] [root@localhost ~]# lsblk -fNAME FSTYPE LABEL UUID MOUNTPOINTsr0 vda ├─vda1 xfs 1a55b4e7-3e79-4319-8fd0-7ceb3d1ab505 /boot└─vda2 LVM2_member 0Sybbx-w3aS-ZdSN-1zQO-eXpw-0zqz-YcYT4V ├─centos-root xfs f1205cb4-8a06-44a8-bece-89e8610e5a77 / └─centos-swap swap 7ccb94cc-3909-4af8-9abf-e1b63d627f52 [SWAP]#当前物理卷空间并没有扩容，需要执行下面操作扩容PV[root@localhost ~]# pvs PV VG Fmt Attr PSize PFree /dev/vda2 centos lvm2 a-- <9.00g 0 [root@localhost ~]# pvresize --setphysicalvolumesize 19G /dev/vda2 WARNING: /dev/vda2: Overriding real size <19.00 GiB. You could lose data./dev/vda2: Requested size 19.00 GiB exceeds real size <19.00 GiB. Proceed? [y/n]: y WARNING: /dev/vda2: Pretending size is 39845888 not 39843840 sectors. Physical volume "/dev/vda2" changed 1 physical volume(s) resized or updated / 0 physical volume(s) not resized [root@localhost ~]# pvs PV VG Fmt Attr PSize PFree /dev/vda2 centos lvm2 a-- <19.00g 10.00g#逻辑卷组被自动扩容[root@localhost ~]# vgs -a VG #PV #LV #SN Attr VSize VFree centos 1 2 0 wz--n- <19.00g 0 #扩容指定逻辑卷[root@localhost ~]# lvextend -r -l +100%free /dev/centos/root Size of logical volume centos/root changed from <8.00 GiB (2047 extents) to <18.00 GiB (4607 extents). Logical volume centos/root successfully resized.meta-data=/dev/mapper/centos-root isize=512 agcount=4, agsize=524032 blks = sectsz=512 attr=2, projid32bit=1 = crc=1 finobt=0 spinodes=0data = bsize=4096 blocks=2096128, imaxpct=25 = sunit=0 swidth=0 blksnaming =version 2 bsize=4096 ascii-ci=0 ftype=1log =internal bsize=4096 blocks=2560, versinotallow=2 = sectsz=512 sunit=0 blks, lazy-count=1realtime =none extsz=4096 blocks=0, rtextents=0data blocks changed from 2096128 to 4717568[root@localhost ~]# lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert root centos -wi-ao---- <18.00g swap centos -wi-ao---- 1.00g [root@localhost ~]# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTsr0 11:0 1 1024M 0 rom vda 252:0 0 20G 0 disk ├─vda1 252:1 0 1G 0 part /boot└─vda2 252:2 0 19G 0 part ├─centos-root 253:0 0 18G 0 lvm / └─centos-swap 253:1 0 1G 0 lvm [SWAP]--------------------------------------------------------------------------------#如果是分区不是逻辑卷，则执行如下操作#如果是xfs文件系统xfs_growfs /#如果是extresize2fs /dev/vda2----------------------------------------------------------------------------------

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