[DRBD-user] New to the list and a ?

Benjamin Zachary ben at levelfive.us
Fri Nov 9 19:49:39 CET 2007


That’s what we are doing next. We have tested this internally with 2 boxes on the LAN connected to a single ESX server and verified data is going back and forth in a speedy fashion but that’s all over 100MB. Im going to flip to protocol A and drop this on a T1 wan link and see how it goes. I saw a couple of searches turn up wan-proxy but I didn’t truly understand what was being discussed and why. I will look into it. 

-----Original Message-----
From: drbd-user-bounces at lists.linbit.com [mailto:drbd-user-bounces at lists.linbit.com] On Behalf Of jeffb
Sent: Friday, November 09, 2007 12:25 PM
To: drbd
Subject: Re: [DRBD-user] New to the list and a ?

Kelly Byrd wrote:
> On Fri, 9 Nov 2007 10:39:13 -0500, "Benjamin Zachary" <ben at levelfive.us>
> wrote:
>
>   
>> If Im way off base on how Im planning to utilize drbd advice is welcome.
>>
>>     
> It sounds like you're doing a continuous backup, with no need to fast 
> recovery (you mentioned bringing the secondary online by going and 
> getting it). 
>
> This is a reasonable use, but consider that if you use protocol C, writes
> on your primary are blocked until the data travels the WAN and is written
> on the secondary. If you must have an exact copy, this will work, but
> something less synchronous might work too. 
>   

While you're still testing, I would make sure you test what happens with 
extended writes to the primary when the secondary is on the other end of 
a slow link.. You might find that buffers and queues can get full, and 
impact performance on the primary..

I think I saw something recently about a wan proxy setup the they're 
working on. I would guess
 that using that is the best way to go for your setup...


Quote from a recent message:
------------------------------------------------------------------------------------------------------------
Subject: Re: [DRBD-user] DRBD over long distances
Date: 10/12/2007 07:45 AM

On Fri, 12 Oct 2007 14:26:09 +0200, Philipp Reisner
<philipp.reisner at linbit.com> wrote:


> > We (in the sense of LINBIT) have just developed a DRBD-proxy tailored
> > for especially this purpose. We just have not yet told anybody about it.
> > Maybe you want to contact us in that regard...
> > 
>   

It seems to me that you *just* told many people about it  :-) 





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