We have gotten very good performance from netapp and postgres 7.4.11 .
I was able to push about 100MB/s over gigE, but that was limited by
our netapp.
DAS will generally always be faster, but if for example you have 2
disks vs. 100 NFS mounted ,NFS will be faster.
NFS is very reliable and I would stay away from iscsi.
Regards,
Dan Gorman
On Apr 26, 2006, at 7:35 PM, Steve Wampler wrote:
> On Wed, Apr 26, 2006 at 10:06:58PM -0400, Ketema Harris wrote:
>> I was wondering if there were any performance issues with having a
>> data
>> directory that was an nfs mounted drive? Say like a SAN or NAS
>> device? Has
>> anyone done this before?
>
> My understanding is that NFS is pretty poor in performance in general,
> so I would expect it to be particularly bad for a DB. You might run
> some (non-DB) performance tests to get a feel for how bad it might me.
> (Someone once told me that NFS topped out at around 12MB/s, but I
> don't
> know if that's really true [they were trying to sell a competitive
> networked filesystem]).
>
> In any event, you're at least limited by ethernet speeds, if not more.
>
> --
> Steve Wampler -- swampler@noao.edu
> The gods that smiled on your birth are now laughing out loud.
>
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