Re: Linux NFS vs NetApp

[Neil Brown]

On Tuesday January 11, ltd@xxxxxxxxx wrote:
> At 08:54 PM 11/01/2005, Neil Brown wrote:
> >If you want to come anything close to comparable with a Netapp, get a
> >few hundred Megabytes of NVRAM (e.g. www.umem.com), and configure it
> >as an external journal for your filesystem (I know this can be done
> >for ext3, I don't know about other filesystems).  Then make sure your
> >filesystem journals all data, not just metadata (data=journal option
> >to ext3).
> 
> NetApp's WAFL only journals metadata in NVRAM ...
> (one of the primary reasons its called WAFL is that the data-write only 
> happens once..).
> 

That may be, though it doesn't fit with my (admittedly limitted)
understanding of WAFL.

However Linux NFS definitely runs faster over ext3 if data=journal is
selected.

NeilBrown
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