[Linux-cluster] 32bits vs 64bits (was: GFS limits: fs size, etc.)

Axel Thimm Axel.Thimm at ATrpms.net
Mon Sep 13 16:15:08 UTC 2004

On Fri, Sep 10, 2004 at 01:05:03PM -0500, Ken Preslan wrote:
> For Linux 2.6 on a 32-bit platform, the max filesystem size is 16TB if
> you trust the sign bit, 8TB if you don't.  This limit comes from the
> 32-bit page index in the "struct page": 2^32 * 4096 bytes/page = 16TB.
> For Linux 2.6 on a 64-bit platform, the max filesystem size is *big*.
> Something around 2^64 bytes.

That means that you need to have a cluster of equal-bit-arch members?

One can certainly not add a 32-bit cluster member to a 64-bit > 16TB
crafted cluster. What about smaller sized filesystems? Would 32bits
and 64bits work nicely together, or are there more barriers?
Axel.Thimm at ATrpms.net
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