[sheepdog-users] [sheepdog] alibaba sheepdog question

[Valerio Pachera]

2015-07-06 9:15 GMT+02:00 Vasiliy Tolstov <v.tolstov at selfip.ru>:

>
> http://searchcloudstorage.techtarget.com/news/2240242577/Alibaba-details-cold-storage-engine-for-Aliyun-cloud
>
> what mean :
>
> Performance was slow when Sheepdog used the server as the node for its
> consistent hashing algorithm, according to Dong. If one disk failed,
> the server fetched the data from other servers and calculated the
> result of the erasure code to recover the lost data, he said.
>
> To remove the bottleneck, the team used the hard disk instead of the
> server as the node for the consistent hashing algorithm, enabling all
> the servers in the sub-cluster to participate in the recovery work if
> a hard disk failed.
>

I think its about the building option '--enable-diskvnodes'.
It's disabled by default.
If disk fails, its content is replicated on the same node without
triggering a cluster reweight.
If you build sheepdog wiht '--enable-diskvnodes' options, when a disk
fails, a cluster reweight is called.
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