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

[Jerry Smith]

Thanks Suni, that makes sense.  The largest number I may mount 
concurrently is 12, I just went a bit bigger for "possible" growth.

I appreciate the fast response.

Jerry



Sunil Mushran wrote:
> -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 
> <mailto: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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