[ZendTo] Re: Probably a stupid questionŠ .

[Brad Beckenhauer]

Since you are running on vmware, you can optimize your disk IO by setting elevator=noop ( google it).
 
IMO, Zendto won't get a big benefit by using the elevator setting, but our other disk IO intensive systems showed a marked increase in IOP performance (about 30% as measured by NetAPP Balance).  Most, if not all linux systems use cfq.  What happens is that a disk io is requested, cfq queues the request and hands it to the vmware abstraction layer and then the IO request is handed to the NetApp which re-queues the request.
 
We're running elevator=noop in grub's menu.lst on Redhat v5 & 6 , SLES v10 & 11 and CentOS v5 & 6 (32 and 64 bit) systems on Vmware Esxi systems.
 
Enjoy
Brad


>>> On 7/15/2013 at 11:08 AM, John Thurston <john.thurston at alaska.gov> wrote:

On 7/13/2013 8:21 AM, Gray McCord wrote:
> Thanks, John!  I'll give this a try. BTW, when you talk about less
> throughput, can you tell about how much?

I did not perform benchmarks in either configuration. But based on my 
personal observations it is no more than half the throughput. Note, this 
isn't responsiveness or latency I'm discussing, this is time required to 
transfer a large file.

If this were a mission-critical application, I don't think I'd deploy it 
this way. Since this is a kinda-best-effort application for us, the 
throughput isn't the deciding factor. I hope, someday, to move the 
application behind a NetScaler and retire my apache proxy.

YMMV. In my deployment, I'm proxying https via https, so there is a lot 
of protocol overhead. I am not using "jumbo" frames. I have made no 
effort to optimize my https cipher negotiations or implement ssl 
off-loading. My ZendTo is running on linux on VMWare ESXi. I don't know 
if VMWare or its networking is is optimally configured.
-- 
    Do things because you should, not just because you can.

John Thurston    907-465-8591
John.Thurston at alaska.gov
Enterprise Technology Services
Department of Administration
State of Alaska
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