How to create filesystem with lower reserve space

[dictum9]

11.23

I know by default, the reserve space is 10% but I want it to be 1%

What option do I use?

[Patrick Wallek · Accepted solution]

What type of file system are you creating?

HFS
VxFS
Something else?

For information check the man page for the newfs and/or mkfs command for the file system type you want to create.

For example:

man newfs_hfs
man newfs_vxfs
man mkfs_hfs
man mkfs_vxfs

[dictum9]

-F vxfs

[Pete Randall]

I, at least, am going to need more information. The only way I know of to create a file system is by using the newfs command and the newfs command says absolutely nothing about reserve space.

What are you referring to? Which command? What type of "filesystem"?


Pete

[James R. Ferguson]

Hi:

I would assume that you are referring to the 'minfree' value for HFS filesystems. This is set during a 'newfs' but can be changed with 'tunefs'. HFS filesystems are deprecated.

Regards!

...JRF...

[Pete Randall]

OK, vxfs. However, I know of no "reserve" in vxfs so I'm still confused. Can you be more specific?


Pete

[dictum9]

These have higher reserve space (10%)

# fstyp -v /dev/vgdevsap/lvol70
vxfs
version: 5
f_bsize: 8192
f_frsize: 1024
f_blocks: 18432000
f_bfree: 18410945
f_bavail: 17260261
f_files: 4603024
f_ffree: 4602736
f_favail: 4602736
f_fsid: 1073807429
f_basetype: vxfs
f_namemax: 254
f_magic: a501fcf5
f_featurebits: 0
f_flag: 0
f_fsindex: 9
f_size: 18432000


these have lower reserve space of 1%

# fstyp -v /dev/vgdevsap/lvol51
vxfs
version: 5
f_bsize: 8192
f_frsize: 1024
f_blocks: 13631488
f_bfree: 540014
f_bavail: 506264
f_files: 135544
f_ffree: 135000
f_favail: 135000
f_fsid: 1073807410
f_basetype: vxfs
f_namemax: 254
f_magic: a501fcf5
f_featurebits: 0
f_flag: 0
f_fsindex: 9
f_size: 13631488
sapdev01:/#


How do I adjust this reserve space, nothing in the man page on newfs mentions it.

[James R. Ferguson]

Hi (again):

> How do I adjust this reserve space, nothing in the man page on newfs mentions it

That's because there is no way to do this for a VxFS filesystem. A filesystem reorganization (with 'fsadm') may change the value you calculate but that's it.

Regards!

...JRF...

[dictum9]

I don't see any such option in fsadm either.

[Patrick Wallek]

I don't think JRF didn't mean that you could **change** the value by using 'fsadm'. I think he meant that the value that is calculated may change after reorganizing the filesystem with fsadm.

In looking at your fstyp output, I don't understand where you are getting the 10% & 1% reserve figures.