[sheepdog-users] Some question from new user

Raymond Burkholder ray at oneunified.net
Thu Nov 16 14:00:23 CET 2017

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

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