Re: EXT4 >16TB resize2fs support

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On 2009-10-29, at 15:54, Justin Maggard wrote:
What is the current expected status of resize2fs support with 64-bit
filesystems?  Specifically, expanding from <16TB to >16TB.  I'm using
the latest code from pu, and seeing some odd things.  I'm not sure
what the 64bit feature flag does exactly, but is the transition not
handled properly?

This isn't supposed to work at all, and in fact should be disabled.
Firstly, the group descriptors are not big enough to hold the 64-bit
block addresses unless the filesystem was originally formatted > 16TB.

Secondly, the resize code has not been made 64-bit clean.

So... what is expected to work at this point, and what is expected to
be broken with the resize process?  Any idea why my fs was shrunk down
to 2.2TB when it was supposed to grow to 18TB?


The filesystem size was truncated to a 32-bit value.

Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.

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