topic Re: Can you "shrink" a Logical Volume? in Operating System - HP-UX

Can you "shrink" a Logical Volume?

Chris Elmore — Wed, 13 Apr 2005 23:02:29 GMT

I just extended the FS by ~6GB on a logical volume that contained my /oradata files and now my Oracle DB won't startup. I want to un-extend the file system back to the original ~24GB size before this problem, is there a way to do that? Please, your help is greatly appreciated.

Very Respectfully,
Chris Elmore

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Aloha Folks,

It seems I was a little hasty. Strangely enough, the file permissions changed on a folder called pfile and resetting them fixed my Oracle startup problem. Strange, I didn't think that running an LVM extend command would change file permissions? Anybody out there run into something like this before? Thanks in advance.

Very Respectfully,
Chris Elmore

Re: Can you "shrink" a Logical Volume?

Gary Cantwell — Thu, 14 Apr 2005 05:25:58 GMT

Hi Chris,

I've added your second question to the original for you,

Cheers,

Gary

Re: Can you "shrink" a Logical Volume?

Alex Lavrov. — Thu, 14 Apr 2005 05:31:26 GMT

lvextend does not change file permission. In a matter of fact, it even does not care if you have a filesystem there. it must be something else that changed the permissions.

about reducing the size of the lvol, it's *highly* not recommended to do so, because you will corrupt your data. The solution is to create a smaller FS.

Re: Can you "shrink" a Logical Volume?

Tim Sanko — Thu, 14 Apr 2005 06:33:11 GMT

1.I have never seen lvextend change permissions.

2.The danger with resizing logical volumes smaller is that you potentially can loose data.

Enough Lecture.

I always like free space My 6 DBAs abhor free space. As I allocate space from symmetrix or CDX it evaporates like it was never there.

Re: Can you "shrink" a Logical Volume?

Chris Elmore — Thu, 14 Apr 2005 13:44:17 GMT

Aloha Guys,

I appreciate the quick responses everyone, your words of HP wisdom have reinforced my own thoughts on the matter. I didn't think that the LVM Extend should have altered file permissions in any way whatsoever, but hearing it from you guys makes me doubly-sure. I will have to chalk this up to the gremlin that lives in our HP machine... =) Thanks guys, you are a very valuable resource for the HP community!

Very Respectfully,
Chris Elmore

Re: Can you "shrink" a Logical Volume?

Jeroen Zonneveld — Fri, 15 Apr 2005 09:35:46 GMT

He

I guess you did not forget the extendfs
after you did the lvextend?

Gr,

Jeroen Zonneveld

Re: Can you "shrink" a Logical Volume?

Chris Elmore — Fri, 15 Apr 2005 17:59:33 GMT

No, the extend seem to work flawlessly, only a single folder had it's file permissions changed, but this was a critical one for Oracle to startup. Personally, I think one of my operators may have inadvertently changed it by accident, but that's only my theory. Thanks for the contrib, I will award you some merit points for trying.

v/r,
Chris

Re: Can you "shrink" a Logical Volume?

Chris Elmore — Fri, 15 Apr 2005 18:00:23 GMT

Thanks, but this thread is closed.