Linux 为什么rsync--sparse会产生比原始qcow2文件更大的qcow2文件 问题:

当我用虚拟机将整个磁盘复制到带有rsync的多个磁盘上时，新磁盘上的磁盘映像（qcow2文件）比原始文件大

旧磁盘： /dev/sda1=>/ssdstor

新磁盘： /dev/sdb1=>/new

细节： 硬件： 2x SSD Curcial M500 960GB固件MU5

OS:ProxMox3.4

文件系统：XFS

命令：

Rsync版本： dpkg-L | grep rsync

• 第一次拷贝后的文件/磁盘比较* （检查所有内容是否正确传输）

rsync-axHv--dry run--force--progress--stats--sparse/ssdstor//new/

sending incremental file list

Number of files: 90,545 (reg: 70,269, dir: 9,395, link: 10,817, dev: 4, special: 60)
Number of created files: 0
Number of deleted files: 0
Number of regular files transferred: 0
Total file size: 634,456,255,674 bytes
Total transferred file size: 0 bytes
Literal data: 0 bytes
Matched data: 0 bytes
File list size: 65,536
File list generation time: 0.001 seconds
File list transfer time: 0.000 seconds
Total bytes sent: 2,097,654
Total bytes received: 9,993

sent 2,097,654 bytes  received 9,993 bytes  1,405,098.00 bytes/sec
total size is 634,456,255,674  speedup is 301,025.86 (DRY RUN)

“白鹭座”（sda sdb）

df-h|egrep'（sda|sdb）'

ls-alshR/ssdstor | grep qcow2

ls-alshR/new | grep qcow2

有人有主意吗

更多测试：

cp—稀疏=始终为vm-105-disk-2.qcow2 vm-105-disk-2.qcow2.new

5,2G -rw-r--r--  1 root root 41G Jul 16 08:07 vm-105-disk-2.qcow2
 34G -rw-r--r--  1 root root 41G Jul 16 11:51 vm-105-disk-2.qcow2.new

---

从

ls

的输出来看，尽管有

df

输出，但它们似乎大小相同。如果不使用

--sparse

，情况如何比较？它们具有相同的“非稀疏”大小，对吗。好问题，我现在用“vm-105-disk-2.qcow2”测试了它，结果是，我得到了与“非稀疏大小”41G相同的大小。这意味着——稀疏工作但不正确？查看

ls

的输出，尽管

df

输出，它们似乎大小相同。如果不使用

--sparse

，情况如何比较？它们具有相同的“非稀疏”大小，对吗。好问题，我现在用“vm-105-disk-2.qcow2”测试了它，结果是，我得到了与“非稀疏大小”41G相同的大小。这意味着——工作稀疏但不正确？

sending incremental file list

Number of files: 90,545 (reg: 70,269, dir: 9,395, link: 10,817, dev: 4, special: 60)
Number of created files: 0
Number of deleted files: 0
Number of regular files transferred: 0
Total file size: 634,456,255,674 bytes
Total transferred file size: 0 bytes
Literal data: 0 bytes
Matched data: 0 bytes
File list size: 65,536
File list generation time: 0.001 seconds
File list transfer time: 0.000 seconds
Total bytes sent: 2,097,654
Total bytes received: 9,993

sent 2,097,654 bytes  received 9,993 bytes  1,405,098.00 bytes/sec
total size is 634,456,255,674  speedup is 301,025.86 (DRY RUN)

/dev/sda1 on /ssdstor type xfs (rw,noatime,nodiratime,attr2,inode64,noquota)
/dev/sdb1 on /new type xfs (rw,noatime,nodiratime,attr2,inode64,noquota)

/dev/sda1             894G    388G  506G   44% /ssdstor
/dev/sdb1             894G    430G  465G   49% /new

77G -rw-r--r--  1 root root 103G Jul 14 09:09 vm-100-disk-1.qcow2
6,2G -rw-r--r--  1 root root  14G Jul 14 09:07 vm-101-disk-1.qcow2
2,0G -rw-r--r--  1 root root 4,1G Jul 14 09:07 vm-101-disk-2.qcow2
17G -rw-r--r--  1 root root 61G Feb 18 09:10 vm-102-disk-1.qcow2
40G -rw-r--r--  1 root root 78G Jul 14 09:06 vm-103-disk-1.qcow2
40G -rw-r--r--  1 root root 41G Jul 14 09:05 vm-103-disk-2.qcow2
31G -rw-r--r--  1 root root 44G Jul 14 09:05 vm-104-disk-1.qcow2
5,2G -rw-r--r--  1 root root 41G Mai  1 01:00 vm-105-disk-2.qcow2
63G -rw-r--r--  1 root root 65G Jul 14 10:04 vm-106-disk-1.qcow2
26G -rw-r--r--  1 root root 65G Jul 14 09:14 vm-107-disk-2.qcow2
51G -rw-r--r--  1 root root 51G Mai 19 21:21 vm-108-disk-1.qcow2

79G -rw-r--r--  1 root root 103G Jul 14 09:09 vm-100-disk-1.qcow2
6,2G -rw-r--r--  1 root root  14G Jul 14 09:07 vm-101-disk-1.qcow2
2,0G -rw-r--r--  1 root root 4,1G Jul 14 09:07 vm-101-disk-2.qcow2
17G -rw-r--r--  1 root root 61G Feb 18 09:10 vm-102-disk-1.qcow2
40G -rw-r--r--  1 root root 78G Jul 14 09:06 vm-103-disk-1.qcow2
41G -rw-r--r--  1 root root 41G Jul 14 09:05 vm-103-disk-2.qcow2
37G -rw-r--r--  1 root root 44G Jul 14 09:05 vm-104-disk-1.qcow2
34G -rw-r--r--  1 root root 41G Mai  1 01:00 vm-105-disk-2.qcow2
63G -rw-r--r--  1 root root 65G Jul 14 10:04 vm-106-disk-1.qcow2
33G -rw-r--r--  1 root root 65G Jul 14 09:14 vm-107-disk-2.qcow2
51G -rw-r--r--  1 root root 51G Mai 19 21:21 vm-108-disk-1.qcow2

5,2G -rw-r--r--  1 root root 41G Jul 16 08:07 vm-105-disk-2.qcow2
 34G -rw-r--r--  1 root root 41G Jul 16 11:51 vm-105-disk-2.qcow2.new