我在LVM LV的顶部有一个500GiB的ext4文件系统。 我想调整LV到100GiB。 我知道如何调整LVM LV上的ext4,但我该如何处理LUKS卷?
mgorven@moab:~% sudo lvdisplay /dev/moab/backup --- Logical volume --- LV Name /dev/moab/backup VG Name moab LV UUID nQ3z1J-Pemd-uTEB-fazN-yEux-nOxP-QQair5 LV Write Access read/write LV Status available # open 1 LV Size 500.00 GiB Current LE 128000 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 2048 Block device 252:3 mgorven@moab:~% sudo cryptsetup status backup /dev/mapper/backup is active and is in use. type: LUKS1 cipher: aes-cbc-essiv:sha256 keysize: 256 bits device: /dev/mapper/moab-backup offset: 3072 sectors size: 1048572928 sectors mode: read/write mgorven@moab:~% sudo tune2fs -l /dev/mapper/backup tune2fs 1.42 (29-Nov-2011) Filesystem volume name: backup Last mounted on: /srv/backup Filesystem UUID: 63877e0e-0549-4c73-8535-b7a81eb363ed Filesystem magic number: 0xEF53 Filesystem revision #: 1 (dynamic) Filesystem features: has_journal ext_attr resize_inode dir_index filetype extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize Filesystem flags: signed_directory_hash Default mount options: (none) Filesystem state: clean with errors Errors behavior: Continue Filesystem OS type: Linux Inode count: 32768000 Block count: 131071616 Reserved block count: 0 Free blocks: 112894078 Free inodes: 32044830 First block: 0 Block size: 4096 Fragment size: 4096 Reserved GDT blocks: 992 Blocks per group: 32768 Fragments per group: 32768 Inodes per group: 8192 Inode blocks per group: 512 RAID stride: 128 RAID stripe width: 128 Flex block group size: 16 Filesystem created: Sun Mar 11 19:24:53 2012 Last mount time: Sat May 19 13:29:27 2012 Last write time: Fri Jun 1 11:07:22 2012 Mount count: 0 Maximum mount count: 100 Last checked: Fri Jun 1 11:03:50 2012 Check interval: 31104000 (12 months) Next check after: Mon May 27 11:03:50 2013 Lifetime writes: 118 GB Reserved blocks uid: 0 (user root) Reserved blocks gid: 0 (group root) First inode: 11 Inode size: 256 Required extra isize: 28 Desired extra isize: 28 Journal inode: 8 Default directory hash: half_md4 Directory Hash Seed: 383bcbc5-fde9-4720-b98e-2d6224713ecf Journal backup: inode blocks
LUKS实际上并不存储设备的大小 – 只是在打开卷时发现它。 因此,只有在过程中没有closures和重新打开的情况下(例如,在线增长)才能发挥作用。 在这种情况下,开放量的大小需要重新发现。
要缩小音量,请使用以下过程:
umount卸载文件系统 resize2fs调整文件系统的大小 cryptsetup luksCloseclosuresLUKS卷 lvreduce或lvresize调整LV大小 cryptsetup luksOpen打开LUKS卷 mount文件系统 您也可以省略luksClose和luksOpen步骤,并在调整LV cryptsetup resize后使用cryptsetup resize大小。 另外请记住,LUKS使用一些额外的空间来存储元数据,所以LV需要比文件系统稍大。 我通常将文件系统的大小调整得更小,然后在重新调整LV大小后再次resize。
如果您正在增长文件系统并想在线执行此操作,则可以使用以下过程:
lvextend或lvresize调整LV的大小 cryptsetup resize大小来更新打开的LUKS卷的cryptsetup resize resize2fs文件系统