External log size limitations

[Emmanuel Florac]

Le Sat, 19 Feb 2011 14:33:58 -0600 vous écriviez:

> To bring this back around to the OP's original question, do you agree
> or disagree with my assertion that a 64 KiB XFS block size will yield
> little if any advantage over a 4 KiB block size, and may in fact have
> some disadvantages, specifically with small file random IO?

Undoubtly. The very big block size of Exastore probably is due to its
parallel cluster configuration; all parallel clusters filesystems I
know of (Lustre, PVFS2, CEPH, Isilon, etc) use 64K or bigger blocks.

The exastore big block size is a constraint due to its architecture,
not a desirable improvement. In fact, exanet suffered from many
performance problems, because general use parallel clusters are hard. 

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