lvcreate: newfs doesn't extend to max lvm size defined

[Stephen Sneeringer]

I've created a logical volume (lvol1) the size of 17gig. When I do the' newfs -F hfs' command, only 15gig are made available for usage. Is there a way to get more usage space?

[Patrick Wallek]

By default an HFS filesystem is built to keep 10% of the filesystem size in reserve for minimum free space.

To change this you can use '-m ' option to set the percentage to something less than 10. See 'man newfs' for more information.

[melvyn burnard]

You would get more space if you did newfs -F vxfs as this does not reserve the 10% of min free space.

hfs always reserves 10% by default, so if you fill up a file system only root can then write any more data, and is sometimes seen by bdf showing a file system being 105% full!
jfs does not do this, and leaves more space for the normal users, but when it is full, it is full!.

HTH

[Peggy Fong · Accepted solution]

If you have to use HFS then you can also use the "tunefs" command to reduce the minimum reserve (you can go as low as 0% reserve).
I believe the command is:
tunefs -m 0 /dev/vgXX/rLVOL
Probably need to have file system unmounted while doing this command.
Peggy