Messages in this thread | | | Date | Tue, 11 Jan 2005 22:38:35 +1100 | From | Lincoln Dale <> | Subject | Re: Linux NFS vs NetApp |
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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,
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