[Ocfs2-users] What is the overhead/disk loss of formatting an ocfs2 filesystem?

[Sunil Mushran]

-N 16 means 16 journals. I think it defaults to 256M journals. So that's
4G. Do you plan to mount it on 16 nodes? If not, reduce that. Other options
is a smaller journal. But you have to be careful as a small journal could
limit your write thruput.


On Mon, Apr 15, 2013 at 1:37 PM, Jerry Smith <jdsmit at sandia.gov> wrote:

> Good afternoon,
>
> I have an OEL 6.3 box with a few ocfs2 mounts mounted locally, and was
> wondering what I should expect to lose via formatting etc from a disk
> usage standpoint.
>
> -bash-4.1$ df -h | grep ocfs2
> /dev/dm-15             12G  1.3G   11G  11% /ocfs2/redo0
> /dev/dm-13            120G  4.2G  116G   4% /ocfs2/software-master
> /dev/dm-10             48G  4.1G   44G   9% /ocfs2/arch0
> /dev/dm-14            2.5T  6.7G  2.5T   1% /ocfs2/ora01
> /dev/dm-11            1.5T  5.7G  1.5T   1% /ocfs2/ora02
> /dev/dm-17            100G  4.2G   96G   5% /ocfs2/ora03
> /dev/dm-12            200G  4.3G  196G   3% /ocfs2/ora04
> /dev/dm-16            3.0T  7.3G  3.0T   1% /ocfs2/orabak01
> -bash-4.1$
>
>
> For example ora04 is 196GB total, but with zero usage it shows 4.3GB used:
>
> [root at oeldb10 ~]#df -h /ocfs2/ora04
> Filesystem            Size  Used Avail Use% Mounted on
> /dev/dm-12            200G  4.3G  196G   3% /ocfs2/ora04
> [root at oeldb10 ~]#find /ocfs2/ora04/ | wc -l
> 3
> [root at oeldb10 ~]#find /ocfs2/ora04/ -exec du -sh {} \;
> 0    /ocfs2/ora04/
> 0    /ocfs2/ora04/lost+found
> 0    /ocfs2/ora04/db66snlux
>
>
> Filesystems formatted via
>
> mkfs -t ocfs2 -N 16 --fs-features=xattr,local -L ${device} ${device}
>
> Mount options
>
> [root at oeldb10 ~]#mount |grep ora04
> /dev/dm-12 on /ocfs2/ora04 type ocfs2
> (rw,_netdev,nointr,user_xattr,heartbeat=none)
>
> Thanks,
>
> --Jerry
>
>
>
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