max fs size with 1k blocks

Eric Sandeen sandeen at
Thu Jul 3 17:36:51 UTC 2008

Jure Pečar wrote:
> Hello,
> what is max ext3 filesystem size when mke2fs is called with -i 1024 -b 1024?

32-bit block number container, so 2^32 * 1024 = 4T.
> If rhel5 supports 8T ext3, 

16T actually, in 2.6.19 and beyond (or distros which backported the fixes)

> I assume that is with 4k blocks, right? 


> So it is right to assume this number to be 2T with 1k blocks?

s/b 4T, see above.

> What about rhel4?

on pre-2.6.18/19 kernels there were really only 31 safe bits, so cut it
in half.


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