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    SubjectRe: Linux NFS vs NetApp
    At 08:54 PM 11/01/2005, Neil Brown wrote:
    >On Monday January 10, phyprabab@yahoo.com wrote:
    > > Hello!
    > >
    > > I am trying to understand how NetApp can be so much
    > > better at NFS servicing than my quad Opteron 250 SAN
    > > attached machine. So I need some help and some
    > > pointers to understand how I can make my opteron
    > > machine come on par (or within 70% NFS performance
    > > range) as that of my NetApp R200. I have run through
    > > the NFS-how-to's and have heard "that is why they cost
    > > so much more", but I really have to consider that
    > > probably most of the ideas that are in the NetApp are
    > > common knowldge (just not in my head).
    > >
    > > Can anyone shed some light on this?
    >
    >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..).


    cheers,

    lincoln.
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