On Nov 19, 2013, at 6:59 PM, Sandon Van Ness <[email protected]> wrote:

> Probably all. See this post I made a while back about a resize failing. 
> Knowing what issues that JFS has with > 32 TiB I was fully prepared for the 
> resize failing so I had everything completely backed up and was going to 
> reformat after anyway (to defrag it):
> 
> http://www.mail-archive.com/[email protected]/msg01806.html
> 
> I would probably reformat.


Thanks. I found the 32 TB error reports but not until after I broke it.

I appreciate the confirmation that it’s not an error just at 32 TB exactly; 
that makes the decision easier: I anticipate an ongoing need to live-resize and 
it looks like JFS just isn’t going to do that.


> If you were in Socal Area I would be willing to lend you a 24 TB box to 
> offload it but it looks like you are not socal so good luck man.


I appreciate the offer. I think things will work out though — I’m finding that 
as the hassle of having a read-only filesystem accumulates the budget available 
for new drives also rises.

—

Would there be any interest in a patch to make the resize operation immediately 
fail when newSize > 32 TB, rather than failing after breaking the on-disk 
structures? I’m not well versed in the JFS codebase but it seems like a pretty 
straightforward change that would users people a lot of pain, so I’d be willing 
to take a look at it if it’s something that might actually get into the 
mainline code.

        Zach


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