Skydiving with an anvil is *possible* ...but not advisable. --Jeff
On Fri, Oct 13, 2023 at 10:21 AM Andreas Dilger via lustre-discuss < lustre-discuss@lists.lustre.org> wrote: > On Oct 13, 2023, at 20:58, Fedele Stabile <fedele.stab...@fis.unical.it> > wrote: > > > Hello everyone, > We are in progress to integrate Lustre on our little HPC Cluster and we > would like to know if it is possible to use the same node in a cluster to > act as an OSS with disks and to also use it as a Compute Node and then > install a Lustre Client. > I know that the OSS server require a modified kernel so I suppose it can > be installed in a virtual machine using kvm on a compute node. > > > There isn't really a problem with running a client + OSS on the same node > anymore, nor is there a problem with an OSS running inside a VM (if you > have SR-IOV and enough CPU+RAM to run the server). > > *HOWEVER*, I don't think it would be good to have the client mounted on > the *VM host*, and then run the OSS on a *VM guest*. That could lead to > deadlocks and priority inversion if the client becomes busy, but depends on > the local OSS to flush dirty data from RAM and the OSS cannot run in the VM > because it doesn't have any RAM... > > If the client and OSS are BOTH run in VMs, or neither run in VMs, or only > the client run in a VM, then that should be OK, but may have reduced > performance due to the server contending with the client application. > > Cheers, Andreas > -- > Andreas Dilger > Lustre Principal Architect > Whamcloud > > > > > > > > _______________________________________________ > lustre-discuss mailing list > lustre-discuss@lists.lustre.org > http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org > -- ------------------------------ Jeff Johnson Co-Founder Aeon Computing jeff.john...@aeoncomputing.com www.aeoncomputing.com t: 858-412-3810 x1001 f: 858-412-3845 m: 619-204-9061 4170 Morena Boulevard, Suite C - San Diego, CA 92117 High-Performance Computing / Lustre Filesystems / Scale-out Storage
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