Jerry Smith
2013-Apr-15 20:37 UTC
[Ocfs2-users] What is the overhead/disk loss of formatting an ocfs2 filesystem?
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} ${device}
Mount options
[root at oeldb10 ~]#mount |grep ora04
/dev/dm-12 on /ocfs2/ora04 type ocfs2
(rw,_netdev,nointr,user_xattr,heartbeat=none)
Thanks,
--Jerry
Sunil Mushran
2013-Apr-15 20:47 UTC
[Ocfs2-users] What is the overhead/disk loss of formatting an ocfs2 filesystem?
-N 16 means 16 journals. I think it defaults to 256M journals. So that's 4G. Do you plan to mount it on 16 nodes? If not, reduce that. Other options is a smaller journal. But you have to be careful as a small journal could limit your write thruput. On Mon, Apr 15, 2013 at 1:37 PM, Jerry Smith <jdsmit at sandia.gov> wrote:> Good afternoon, > > I have an OEL 6.3 box with a few ocfs2 mounts mounted locally, and was > wondering what I should expect to lose via formatting etc from a disk > usage standpoint. > > -bash-4.1$ 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 > > > > _______________________________________________ > Ocfs2-users mailing list > Ocfs2-users at oss.oracle.com > https://oss.oracle.com/mailman/listinfo/ocfs2-users >-------------- next part -------------- An HTML attachment was scrubbed... URL: http://oss.oracle.com/pipermail/ocfs2-users/attachments/20130415/e57d1ac9/attachment.html