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<div class="gmail_quote">On Sun, Oct 9, 2011 at 1:33 PM, Liu Yuan <span dir="ltr">
<<a href="mailto:namei.unix@gmail.com">namei.unix@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex; border-left:1px #ccc solid; padding-left:1ex">
<div class="im">On 10/09/2011 01:07 PM, MORITA Kazutaka wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex; border-left:1px #ccc solid; padding-left:1ex">
At Sun, 9 Oct 2011 11:21:52 +0800,<br>
Yibin Shen wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex; border-left:1px #ccc solid; padding-left:1ex">
Use mmap is much simpler than local backup image, and without<br>
any influence to consistency. but it doesn't improve availability<br>
while whole sheepdog cluster is die(such as some odd network<br>
partition issue).<br>
<br>
anyway, if no one againsts, I will try to implement it in the<br>
near future (after we solved most stability issues)<br>
</blockquote>
Can we implement it as an extension of the cache mechanism? If the<br>
local cache file has whole data in the Sheepdog VDI, we can regard it<br>
as a local backup image.<br>
<br>
Thanks,<br>
<br>
Kazutaka<br>
</blockquote>
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Maybe we can read-ahead in the whole data if network is not busy gradually? When the whole image is read in, we can mark it as 'complete'. If some time the cluster crashes, the complete image would help the VMs on the very node to survive the crash. The dirty
bits will be flushed into cluster store in recovery stage.<br>
<br>
</blockquote>
<div>read-ahead whole image into memory? </div>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex; border-left:1px #ccc solid; padding-left:1ex">
This would improve availability on the node basis.<br>
<br>
Thanks,<br>
<font color="#888888">Yuan</font>
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