Re: 答复: hello, I am confused about a question of rbd

[Dan Mick <dmick@redhat.com>]

Adding back ceph-devel

My point was, ok, ruling out 0, then we can create a block device of
size 1 byte.  Is that useful?  No, it is not.  How about 10 bytes?
1000?  1MB?

There's no good reason to rule out zero.  Is it causing a problem somehow?

On 07/23/2015 06:06 PM, zhengbin.08747@h3c.com wrote:
> If I create a block whose size is zero, it means you absolutely can not use it unless you resize it
> 
> 
> what arbitrary minimum size is too small?  -----> I do not know, If I create a block whose size is larger than zero,it may be can use.
> And why do we have to define a minimum size? we can just make sure the block size is larger than zero
> 
> -----邮件原件-----
> 发件人: Dan Mick [mailto:dmick@redhat.com]
> 发送时间: 2015年7月24日 5:25
> 收件人: Jason Dillaman; zhengbin 08747 (RD)
> 抄送: ceph-devel
> 主题: Re: hello, I am confused about a question of rbd
> 
> Why not zero?
> 
> If the answer is "it can't be used", then, what arbitrary minimum size is too small?
> 
> (also, given that resize exists, it can be used for storage after a resize.)
> 
> On 07/23/2015 06:03 AM, Jason Dillaman wrote:
>> According to the git history, support for zero MB images for the create/resize commands was explicitly added by commit 08f47a4.  Dan Mick or Josh Durgin could probably better explain the history behind the change since it was before my time.
>>
> 
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-- 
Dan Mick
Red Hat, Inc.
Ceph docs: http://ceph.com/docs
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