linux-kernel - Re: [PATCH 00/15] drbd: a block device for HA clusters

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Date:	Fri, 26 Jun 2009 12:32:15 -0700 (PDT)
From:	david@...g.hm
To:	Al Boldi <a1426z@...ab.com>
cc:	James Bottomley <James.Bottomley@...senPartnership.com>,
	Philipp Reisner <philipp.reisner@...bit.com>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jens Axboe <jens.axboe@...cle.com>, Greg KH <gregkh@...e.de>,
	Neil Brown <neilb@...e.de>, Sam Ravnborg <sam@...nborg.org>,
	Dave Jones <davej@...hat.com>,
	Nikanth Karthikesan <knikanth@...e.de>,
	Lars Marowsky-Bree <lmb@...e.de>,
	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>,
	Kyle Moffett <kyle@...fetthome.net>,
	Bart Van Assche <bart.vanassche@...il.com>,
	drbd-dev@...ts.linbit.com,
	Lars Ellenberg <lars.ellenberg@...bit.com>
Subject: Re: [PATCH 00/15] drbd: a block device for HA clusters

On Fri, 26 Jun 2009, Al Boldi wrote:

> James Bottomley wrote:
>> On Fri, 2009-06-26 at 18:43 +0300, Al Boldi wrote:
>>> James Bottomley wrote:
>>>> On Fri, 2009-06-26 at 17:15 +0300, Al Boldi wrote:
>>>>> Philipp Reisner wrote:
>>>>>> Short Description
>>>>>>
>>>>>>   DRBD is a shared-nothing, synchronously replicated block device.
>>>>>
>>>>> What do you mean by "shared-nothing"?
>>>>
>>>> If you actually type "shared nothing" into google, the first hit will
>>>> be the wikipedia article describing this.
>>>
>>> Sure, but the point here is to choose a description that is clear and
>>> self-explanatory, and "shared-nothing" is neither clear nor
>>> self-explanatory.
>>
>> It is clear because everyone agrees on the definition.
>
> Everyone involved in the project maybe, but not everyone interested in "a
> block device for HA clusters".  And you don't want to turn them of by using
> terminology to explain terminology, especially when it's misleading.  Many
> OpenSource projects fail merely for this reason.

anyone who knows the terminology for HA clusters should understand the 
term "shared-nothing"

do you really want the full explination to have to be squeezed into this 
sentance? or even the patch description?

David Lang

>> And it is self
>> explanatory because it's an art term for a well defined concept which
>> forms one of the building blocks of the nomenclature used in clustering.
>> Even if you're not familiar with clustering terminology, the definitions
>> are easy to find via search engines.
>>
>> If you want to find useful quibbles, the term synchronously is wrong:
>> DRBD is capable of both synchronous and asynchronous replication.
>
> Ok, so maybe change the description to reflect this capability.
> Something like:  DRBD is an independent, synch/async replicated block device.
>
>
> Thanks!
>
> --
> Al
>
> --
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