AIX

Hi Guys,

probably a standard issue, so what do I miss here?

Error message:
> chfs -a size=-128M /export/nim/aix/5300-10
chfs: 0506-964 There is not enough free space to shrink the file system.


df shows 0.75GB free

> df -g .
Filesystem GB blocks Free %Used Iused %Iused Mounted on
/dev/lvnimaix5300-10 4.47 0.75 84% 15324 8% /export


du shows about 3.7GB files in use.
> du -sm *
0.00 lost+found
3298.62 lpp
490.47 spot

further info:
/tmp has 512MB free
defragsfs has run on the filesystem
PP SIZE: 32 megabyte(s)

> lsfs -q /dev/lvnimaix5300-10
Name Nodename Mount Pt VFS Size Options Auto Accounting
/dev/lvnimaix5300-10 -- /export/nim/aix/5300-10 jfs2 9371648 rw yes no
(lv size: 9371648, fs size: 9371648, block size: 4096, sparse files: yes, inline log: no, inline log size: 0, EAformat: v1, Quota: no, DMAPI: no, VIX: yes, EFS: no, ISNAPSHOT: no)


How can I see the real-free space of the volume and why can't I shrink this filesystem.??

thanx

Randy

AFAIK there is no command available yet to tell how much an existing filesystem can be shrunk. The problem you encounter is related to filesystem fragmentation (and probably metadata). However, you could try to reduce filesystems size not in one step of 128 MB but in several steps of 32 MB (repeatedly run defragfs then shrink by one PP) and see how far you get. If you need the free space desperately you might be forced to backup the FS content, delete it from the FS, reduce size of empty FS and restore data from backup.

in a new filesystem 4GB large, the files couldn't be copied over (disk-full message)

question is: How can I tell the fs is 100% full instead of the 83% the df-command shows?

df does not show information about FS metadata. Can you backup the data with compression?

if you mean tar or gzip
size after tar: 3.8GB
size after gzip:2.2GB

I extracted everything successfully in a new and smaller filesystem. see below:

> du -sm *
0.00 lost+found
3298.50 lpp
505.18 spot

> df -g .
Filesystem GB blocks Free %Used Iused %Iused Mounted on
/dev/fslv00 3.75 0.03 100% 15324 68% /mnt

why is this possible?

By restoring data from the archive it was written contiguously into the FS. I.e. no fragmentation (at least for the moment being )

Hello Randy,

What is the state of the VG where export/nim/aix/5300-10 is located?
lsvg <vgname>

I have had the same problem. Looking at the VG showed that there were no free PP's in this VG. Normally one would think you do not need free space in de VG to shrink a filesystem. When I added an extra LUN/disk to the VG. I was able to shrink the filesystem. Afterwards I removed the extra LUN/disk.

Regards,

Patrick Prevoo