[sheepdog-users] Some question from new user

[Raymond Burkholder]

If you don't mind some questions:

On 11/16/2017 03:42 AM, Vasiliy Tolstov wrote:
> 2017-11-15 22:49 GMT+03:00 Gandalf Corvotempesta
> <gandalf.corvotempesta at gmail.com>:
>> 1) is sheepdog stable and ready for production use?
> 
> It contains rough edges firstly with cluster recovery when nodes up/down.

Even with the rough edges, do you think it is good enough to run?  You 
are still using it?

> 
>> 2) do I need any metadata servers (like Ceph) or the only needed
>> servers are the storage ones (like Gluster) ?
> 
> No metadata needed, but you need cluster manager (zookeeper, corosync).
> I'm try corosync and it not very stable (not sheepdog, but corosync)
> Sometimes i have split bran when cluster
> divided on parts and only restart corosync solved this issue. (i'm try
> corosync 2.x)

Do you lose data when you encounter these situations or are you able to 
recover successfully and return to normal operation?

> 
>> 3) can I use multiple disks in a server, or each server should
>> "expose" a single filesystem (thus, I have to use RAID)
> 
> Sheepdog supports multidisk but you need metastore to save epoch and
> config data so raid is preferrable.

So, just to confirm, you recommend a raid system of some sort on each 
host, in addition to the replication across hosts which Sheepdog 
supplies?  Is there some reference information I could read about the 
metastore, epoch, and config data?

> 
>> 7) any "scrub" feature to be sure that all object a replicated
>> properly and not subject to "bit-rot" ?
> 
> No, but sheepdog have cluster check (in my case works sometimes with errors)

What sort of errors do you see?  Is there something to fix or do you 
ignore them?

> 

-- 
Raymond Burkholder
ray at oneunified.net
https://blog.raymond.burkholder.net

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