cf cell's df result question


강경원 <kyungwon.kang at samsung.com...>
 

Hi, when I check the cell's disk, it's using 10G but df result reports only 5G is used. Can I know why?

 

diego-cell/b3d42906-84f3-40db-8361-64232dac4ff8:/var/vcap/data# df -h
Filesystem      Size  Used Avail Use% Mounted on
udev            3.9G  4.0K  3.9G   1% /dev
tmpfs           799M  548K  798M   1% /run
/dev/xvda1      2.9G  1.9G  866M  69% /
none            4.0K     0  4.0K   0% /sys/fs/cgroup
none            5.0M     0  5.0M   0% /run/lock
none            3.9G  3.6M  3.9G   1% /run/shm
none            100M     0  100M   0% /run/user
/dev/xvdb2       91G  5.1G   81G   6% /var/vcap/data

 

Regards,

Kyungwon Kang.

 
강경원(Kang, Kyungwon) Marcus Kang
RHCA/PMP/ITIL Master/OCP(Oracle/Solaris)
직급:수석
클라우드기술그룹(클라우드) M.P: 82-10-8998-2092
kyungwon.kang@...
 

 


Lior Okman
 

Hi,

Usually a certain percentage (5% by default) of the available disk space is
reserved for uid 0. You can check to see what that percentage amounts to in
bytes using the following command if the filesystem is ext{2,3,4}:

echo $(( $(tune2fs -l /dev/xvdb2 |grep "Reserved block count"|cut -f2 -d:
) * $(tune2fs -l /dev/xvdb2 | grep "Block size" |cut -f2 -d: ) ))

See tune2fs(8) for details.

For a 100G disk this would amount to your missing 5G.

--
Lior

On Thu, Sep 14, 2017 at 1:45 PM, 강경원 <kyungwon.kang(a)samsung.com> wrote:

Hi, when I check the cell's disk, it's using 10G but df result reports
only 5G is used. Can I know why?



diego-cell/b3d42906-84f3-40db-8361-64232dac4ff8:/var/vcap/data# df -h
Filesystem Size Used Avail Use% Mounted on
udev 3.9G 4.0K 3.9G 1% /dev
tmpfs 799M 548K 798M 1% /run
/dev/xvda1 2.9G 1.9G 866M 69% /
none 4.0K 0 4.0K 0% /sys/fs/cgroup
none 5.0M 0 5.0M 0% /run/lock
none 3.9G 3.6M 3.9G 1% /run/shm
none 100M 0 100M 0% /run/user
/dev/xvdb2 91G 5.1G 81G 6% /var/vcap/data



Regards,

Kyungwon Kang.


강경원(Kang, Kyungwon) Marcus Kang
RHCA/PMP/ITIL Master/OCP(Oracle/Solaris)
직급:수석
클라우드기술그룹(클라우드) M.P: 82-10-8998-2092
kyungwon.kang(a)samsung.com





George Lestaris
 

Hello Kyungwon,

Where do you see that your cell disk is using 10G? It could be because of
how the BOSH VMs partition the disk.

On Thu, Sep 14, 2017 at 9:46 PM, Lior Okman <lior.okman(a)gmail.com> wrote:


Hi,

Usually a certain percentage (5% by default) of the available disk space
is reserved for uid 0. You can check to see what that percentage amounts to
in bytes using the following command if the filesystem is ext{2,3,4}:

echo $(( $(tune2fs -l /dev/xvdb2 |grep "Reserved block count"|cut -f2
-d: ) * $(tune2fs -l /dev/xvdb2 | grep "Block size" |cut -f2 -d: ) ))

See tune2fs(8) for details.

For a 100G disk this would amount to your missing 5G.

--
Lior

On Thu, Sep 14, 2017 at 1:45 PM, 강경원 <kyungwon.kang(a)samsung.com> wrote:

Hi, when I check the cell's disk, it's using 10G but df result reports
only 5G is used. Can I know why?



diego-cell/b3d42906-84f3-40db-8361-64232dac4ff8:/var/vcap/data# df -h
Filesystem Size Used Avail Use% Mounted on
udev 3.9G 4.0K 3.9G 1% /dev
tmpfs 799M 548K 798M 1% /run
/dev/xvda1 2.9G 1.9G 866M 69% /
none 4.0K 0 4.0K 0% /sys/fs/cgroup
none 5.0M 0 5.0M 0% /run/lock
none 3.9G 3.6M 3.9G 1% /run/shm
none 100M 0 100M 0% /run/user
/dev/xvdb2 91G 5.1G 81G 6% /var/vcap/data



Regards,

Kyungwon Kang.


강경원(Kang, Kyungwon) Marcus Kang
RHCA/PMP/ITIL Master/OCP(Oracle/Solaris)
직급:수석
클라우드기술그룹(클라우드) M.P: 82-10-8998-2092
kyungwon.kang(a)samsung.com




--
George Lestaris
GrootFS <https://www.github.com/cloudfoundry/grootfs> Product Manager, Cloud
Foundry <https://www.cloudfoundry.org/>, Pivotal <https://www.pivotal.io/>


강경원 <atplus12345 at gmail.com...>
 

I cut the loop device info for containers. Where can I find the rep's disk
calculation algorithm or source code for available disk size?

On Sep 15, 2017 19:14, "George Lestaris" <glestaris(a)pivotal.io> wrote:

Hello Kyungwon,

Where do you see that your cell disk is using 10G? It could be because of
how the BOSH VMs partition the disk.

On Thu, Sep 14, 2017 at 9:46 PM, Lior Okman <lior.okman(a)gmail.com> wrote:


Hi,

Usually a certain percentage (5% by default) of the available disk space
is reserved for uid 0. You can check to see what that percentage amounts to
in bytes using the following command if the filesystem is ext{2,3,4}:

echo $(( $(tune2fs -l /dev/xvdb2 |grep "Reserved block count"|cut -f2
-d: ) * $(tune2fs -l /dev/xvdb2 | grep "Block size" |cut -f2 -d: ) ))

See tune2fs(8) for details.

For a 100G disk this would amount to your missing 5G.

--
Lior

On Thu, Sep 14, 2017 at 1:45 PM, 강경원 <kyungwon.kang(a)samsung.com> wrote:

Hi, when I check the cell's disk, it's using 10G but df result reports
only 5G is used. Can I know why?



diego-cell/b3d42906-84f3-40db-8361-64232dac4ff8:/var/vcap/data# df -h
Filesystem Size Used Avail Use% Mounted on
udev 3.9G 4.0K 3.9G 1% /dev
tmpfs 799M 548K 798M 1% /run
/dev/xvda1 2.9G 1.9G 866M 69% /
none 4.0K 0 4.0K 0% /sys/fs/cgroup
none 5.0M 0 5.0M 0% /run/lock
none 3.9G 3.6M 3.9G 1% /run/shm
none 100M 0 100M 0% /run/user
/dev/xvdb2 91G 5.1G 81G 6% /var/vcap/data



Regards,

Kyungwon Kang.


강경원(Kang, Kyungwon) Marcus Kang
RHCA/PMP/ITIL Master/OCP(Oracle/Solaris)
직급:수석
클라우드기술그룹(클라우드) M.P: 82-10-8998-2092
kyungwon.kang(a)samsung.com





--
George Lestaris
GrootFS <https://www.github.com/cloudfoundry/grootfs> Product Manager, Cloud
Foundry <https://www.cloudfoundry.org/>, Pivotal <https://www.pivotal.io/>