Hi everyone, quick question: can I get ceph to replicate a bunch of files to every host in compute cluster and then have those hosts read those files from local disk?
TFM looks like a custom crush map should get the files to [osd on] every host, but I'm not clear on the read step: do I need an mds on every host and mount the fs off localhost's mds? (We've $APP running on the cluster, normally one instance/cpu core, that mmap's (read only) ~30GB of binary files. I/O over NFS kills the cluster even with a few hosts. Currently the files are rsync'ed to every host at the start of the batch; that'll only scale to a few dozen hosts at best.) TIA, -- Dimitri Maziuk Programmer/sysadmin BioMagResBank, UW-Madison -- http://www.bmrb.wisc.edu
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