Re: [Libguestfs] virtdf outputs on host differs from df in guest
To summarise:
[In guest]
python -c 'import os; s = os.statvfs ("/boot"); print s'
posix.statvfs_result(f_bsize=4096, f_frsize=4096, f_blocks=127147,
f_bfree=93815, f_bavail=93815, f_files=512000, f_ffree=511626,
f_favail=511626, f_flag=4096, f_namemax=255)
[From the host via libguestfs]
# sudo guestfish --ro -d rpm-build-for-7.2 -i statvfs /boot
bsize: 4096
frsize: 4096
blocks: 127147
bfree: 100215
bavail: 100215
files: 512000
ffree: 511626
favail: 511626
fsid: 2049
flag: 4097
namemax: 255
[In virt-rescue]
Block size: 4096 Fundamental block size: 4096
Blocks: Total: 127147 Free: 93815 Available: 93815
Inodes: Total: 512000 Free: 511626
The block stats are the same as the "in guest" results above,
but slightly different from libguestfs.
- * - * - * -
I wanted to see if I could reproduce this with a very simple and
reproducible example. I made the assumption that this guest is using XFS.
(1) Make an XFS filesystem and use libguestfs to query the statvfs:
$ guestfish -N fs:xfs -m /dev/sda1 statvfs /
bsize: 4096
frsize: 4096
blocks: 24713
bfree: 23347
bavail: 23347
files: 51136
ffree: 51133
favail: 51133
fsid: 2049
flag: 4096
namemax: 255
(2) Open the same disk image in virt-rescue and examine with stat
command:
$ virt-rescue -a test1.img
<rescue> mount /dev/sda1 /sysroot
<rescue> stat -f /sysroot
File: "/sysroot"
ID: 80100000000 Namelen: 255 Type: xfs
Block size: 4096 Fundamental block size: 4096
Blocks: Total: 24713 Free: 23347 Available: 23347
Inodes: Total: 51136 Free: 51133
In this case the numbers are the same ...
I would really like a bit more information though:
(a) Are you using XFS or another filesystem?
(b) Can you make a small independent reproducer like mine above?
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
libguestfs lets you edit virtual machines. Supports shell scripting,
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