LVM一分钟上手

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$ dd if=/dev/zero of=disk.img bs=4K count=$((5*1024*1024))
5242880+0 records in
5242880+0 records out
21474836480 bytes (21 GB, 20 GiB) copied, 850.981 s, 25.2 MB/s

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$ losetup --partscan --show --find disk.img
/dev/loop0

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$ pvcreate /dev/loop0
  Physical volume "/dev/loop0" successfully created.

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$ vgcreate loopvg /dev/loop0
  Volume group "loopvg" successfully created

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$ tar zcvf disk.img.gz disk.img
disk.img

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$ lvcreate loopvg -L 1G -n disk1
  Logical volume "disk1" created.

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$ lvs
  LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
  disk1 loopvg -wi-a----- 1.00g

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$ mkfs.xfs /dev/mapper/loopvg-disk1
meta-data=/dev/mapper/loopvg-disk1 isize=512 agcount=4, agsize=65536 blks
         = sectsz=512 attr=2, projid32bit=1
         = crc=1 finobt=0, sparse=0
data = bsize=4096 blocks=262144, imaxpct=25
         = sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal log bsize=4096 blocks=2560, version=2
         = sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0

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$ mkdir /mnt/fast-disks/disk1
$ mount /dev/mapper/loopvg-disk1 /mnt/fast-disks/disk1
$ mount | grep /mnt/fast-disks/disk1
/dev/mapper/loopvg-disk1 on /mnt/fast-disks/disk1 type xfs (rw,relatime,seclabel,attr2,inode64,noquota)