Is there a partiton size limit?

don fisher hdf3 at
Mon Mar 16 19:54:45 UTC 2009

Matthew Flaschen wrote:
> Norberto Bensa wrote:
>> On Sun, Mar 15, 2009 at 8:32 PM, Norberto Bensa <nbensa at> wrote:
>>> If you're using server kernels, then I have no idea.
>> Oh. I've found this:
>> So you need to tell mkfs.ext to use 8KB blocks
> As that page says, 8KB blocks are only available on Alpha, which I doubt
> Don has.
>> mkfs.ext3 -b 4096 should give you a 16TB filesystem
> 4096 bytes is 4 KB. Luckily, that is sufficient for a 10 TB filesystem
> (max of 16 TB with that option).
> Matt Flaschen

The kernel does not have LBD  (support for large block devices) or LSF 
(support for large single files) enabled. Examination of the configure 
dependencies shows they are both dependent on !64BIT. My machine is 
64BIT, so these are available as configurable options.

In the past, under Fedora, these both were enable and my option was Y. I 
do not know if LBD and LSF are patches to let 32BIT machines handle 
large files or a bug in the kernel. The same definition exists in the 
latest at

I have been doing science for awhile, so have forgotten a lot of the 
details. And the switch from Fedora to Ubuntu has complicated the 
situation a bit. I do not remember how the limits on file system size 
are reflected in the work size.


|    Don Fisher                         hdf3 at        |
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