AIX

Hello,

I changed the policy to minimum today but still the same - I cannot shrink and it coredumps when extending.

Looks like I really have to clean and drop ... 4.5 TB - yeah - will take a while

Thanks for your help
rgds
zxmaus

I've had simular issues when attempting to shrink a filesystem. I am far from a guru but I found sometimes I don't have enough room to shrink of that makes any since. So instead of shrinking by large numbers I went to small and stepped my way up. I reduced by 1G then 2 then More gig... It compounded pretty quick.

I would test my simplistic theory by tring to shrink by One Gig and see what you get.

thats what I tried already - but it doesnt even give a single pp away

Rgds
zxmaus

Remember that "defragfs" does NOT mean "defrag filesystem". Rather it means "defrag free space". This info came to me from the mouth of one of the AIX developers at the AIX Technical University this past year.

I've run into this same problem numerous times. I'll have 3 gig free in a filesystem and try to shrink it down by 1 gig to assign some place else. It then spits out those errors saying it can't shrink it.

The problem is that the data is too spread out physically on the disk. The only way you can reduce the size of an JFS2 filesystem that won't shrink, that I know of, is to create another filesystem big enough to hold all the data, copy it over, shrink the original JFS2 filesystem (or even recreate it if you have to), and then copy the data back over to it.

The "fs" in "defragfs" is so misleading.

I have meanwhile removed my filesystems - and identified the rootcause - apparently the magical limit seems to be the 2 TB filesystem size - once you pass this size you can still extend but no more reduce the filesystem size - no matter how many free pps or even disks you have. reorg and defrag don't help and even freeing up whole disks doesnt make anything any better.
IBM is aware about this problem but doesnt have a solution - their comment - nothing we can do ...
Rgds
zxmaus