We would like to run a mdt and mgs on a node that will also have devices providing some ost''s is this a problem? Does it run into the same problems as a client thats also a server has leaving us in unrecoverable state? Thanks Brock Palen Center for Advanced Computing brockp at umich.edu (734)936-1985
Hi,
I have two Lustre installations that have mgs, mdt and ost
served by the same server.
Not an ideal situation, but works. The node that has mgs, mdt and ost is
not a Lustre client.
Making it also a client was an unstable configuration in previous
Lustre releases.
Regards
Balagopal
Brock Palen wrote:> We would like to run a mdt and mgs on a node that will also have
> devices providing some ost''s is this a problem? Does it run into
> the same problems as a client thats also a server has leaving us in
> unrecoverable state?
>
> Thanks
>
> Brock Palen
> Center for Advanced Computing
> brockp at umich.edu
> (734)936-1985
>
>
> _______________________________________________
> Lustre-discuss mailing list
> Lustre-discuss at clusterfs.com
> https://mail.clusterfs.com/mailman/listinfo/lustre-discuss
>
Hello! On Nov 7, 2007, at 3:52 PM, Brock Palen wrote:> We would like to run a mdt and mgs on a node that will also have > devices providing some ost''s is this a problem? Does it run into > the same problems as a client thats also a server has leaving us in > unrecoverable state?Yes, this has similar recovery implications at the moment - this configuration will not have recovery working, because mds that is a client of ost is not available for replay. But we plan to fix this eventually. Bye, Oleg
On Nov 7, 2007, at 4:34 PM, Oleg Drokin wrote:> Hello! > > On Nov 7, 2007, at 3:52 PM, Brock Palen wrote: > >> We would like to run a mdt and mgs on a node that will also have >> devices providing some ost''s is this a problem? Does it run into >> the same problems as a client thats also a server has leaving us in >> unrecoverable state? > > Yes, this has similar recovery implications at the moment - this > configuration will not have recovery working, because mds that is a > client of ost is not available for replay. But we plan to fix this > eventually.Whoops I guess I confused some people (or im confused now) the server would not be a clinet of the file system, but would be a mds and oss at teh same time. Is this a problem? No repeat No OSS MDS or MGS will mount the final filesystem.> > Bye, > Oleg > >
Brock Palen wrote:> On Nov 7, 2007, at 4:34 PM, Oleg Drokin wrote: > >> Hello! >> >> On Nov 7, 2007, at 3:52 PM, Brock Palen wrote: >> >>> We would like to run a mdt and mgs on a node that will also have >>> devices providing some ost''s is this a problem? Does it run into >>> the same problems as a client thats also a server has leaving us in >>> unrecoverable state? >> Yes, this has similar recovery implications at the moment - this >> configuration will not have recovery working, because mds that is a >> client of ost is not available for replay. But we plan to fix this >> eventually. > > Whoops I guess I confused some people (or im confused now) the > server would not be a clinet of the file system, but would be a mds > and oss at teh same time. Is this a problem? No repeat No OSS MDS > or MGS will mount the final filesystem.No confusion. The MDS is actually a ''client'' of the OSS, so you have the same deadlock/recovery issue that exists with the filesystem mount client. cliffw> >> Bye, >> Oleg >> >> > > _______________________________________________ > Lustre-discuss mailing list > Lustre-discuss at clusterfs.com > https://mail.clusterfs.com/mailman/listinfo/lustre-discuss