[Discuss] Dev Ops - architecture (local not cloud)

[Bill Ricker]

On Fri, Dec 6, 2013 at 10:56 AM, Richard Pieri <richard.pieri at gmail.com>wrote:

> Greg Rundlett (freephile) wrote:
>
>>   I think it's pretty obvious why it's not performing: user home
>> directories
>> (where developers compile) should not be NFS mounted. [1]  The source
>> repositories themselves should also not be stored on a NAS.
>>
>
> Neither of these statements are true.
>
> User home directories is one of the best things you can do with NFS. It's
> what it was designed to do after all.
>

User home directories should be NFS/NAS, yes. But their checkout / build
area need not be in Home filesystem. Even if it's symlinked or temporarily
mounted there.

Your performance problem is simple. Every Unix and Linux vendor in the
> world these days defaults to setting NFS write caching off. This makes NFS
> performance excruciatingly poor for lots of small writes, the kind of
> behavior you see when someone compiles lots of little C files. Enable write
> caching on the home directories and watch your performance improve
> dramatically.
>

There are many other performance traps in NFS/NAS too. That is one.


> Storing repositories on NAS has less to do with yes/no and more to do with
> how the code servers -- the servers that users check out and in through --
> talk to NAS and what you've done (or not done) to optimize that performance
>


Having the repository on NAS can work, although i'd prefer it behind a real
server than trust multiple writers to update it concurrently correctly.

-- 
Bill
@n1vux bill.n1vux at gmail.com