NFS Performance issue against NetApp

[Jeremy Chadwick]

On Wed, May 15, 2013 at 03:19:21AM +0300, Daniel Kalchev wrote:
> 
> > 
> >> Probably off-topic but worth pointing out: I do not know about Solaris,
> >> but Linux has multiple layers of caching, and is well-known for doing
> >> things like caching (and aggregating!) reads/writes to **block** devices
> >> (this is why on Linux you have to make sure to avoid caching your
> >> application use O_DIRECT with open(2) or other mechanisms -- the BSDs do
> >> not do this, block devices are always non-cached).
> > 
> > Caching *should* only come into play after the first run of the application … the first run after a reboot of the server shouldn't have anything in cache  yet for caching to come into play 
> > 
> 
> Or, instead of issuing 30 separate NFS calls over the network, issue just one. With more latency the difference will be more pronounced.
> 
> I believe Jeremy was referring more to the aggregating aspect, which might produce significant difference for poorly written software. 

Thanks Daniel -- yes, correct.  :-)

-- 
| Jeremy Chadwick                                   jdc at koitsu.org |
| UNIX Systems Administrator                http://jdc.koitsu.org/ |
| Mountain View, CA, US                                            |
| Making life hard for others since 1977.             PGP 4BD6C0CB |