Reading more, I see that the available methods for block store are iSCSI, and that the LUNS are attached to the host. From there, a symlink tree exposes the target to the guest in a predictable way on every host.
So then to modify my question a bit, are all LUNs attached to all hosts simultaneously? Or does the attachment only happen when a migration is to occur? Also, is the LUN put into a read-only mode or something during migration on the original host to protect the data? Or, must a clustering filesystem be employed? Guess I have a lot to read :) Thanks -C On Sat, May 5, 2012 at 5:23 PM, Chris Barry <[email protected]> wrote: > Hi Gubda, > > Thank you for replying. My goal was to use a single shared iso image to > boot from, and use an in-memory minimal linux on each node that had no > 'disk' at all, then to mount logical data volume(s) from a centralized > storage system. Perhaps that is outside the scope of opennebula's design > goals, and may not be possible - I'm just now investigating it. > > I see you are using NFS, but my desire is to use block storage instead, > ideally LVM, and not incur the performance penalties of IPoIB. It does > sound simple though, and that's always good. Do you have any performance > data on that setup in terms of IOPs and/or MB/s write speeds? It does sound > interesting. > > Thanks again, > -C > > > On Sat, May 5, 2012 at 4:01 PM, Guba Sándor <[email protected]> wrote: > >> Hi >> >> I'm using InfiniBand to make shared storage. My setup is simple: the >> opennebula installdir is shared on NFS with the worker nodes. >> >> - I don't understand what you mean on shared image. There will be a copy >> (or symlink if the image is persistent) on the NFS host and that is that >> the hypervisor will use over the network. Live migrate is available beacuse >> you don't move the image only another host will use it from the same spot. >> With my linux images I have about 30s delay when livemigrate. You can use >> qcow2 driver for shared image. >> >> - I don't understant exactly what you mean on "guest unaware". If you >> mean storage - host connection it has nothing to do with nebula. You can >> use any shared filesystem. NFS uses IPoIB connection. >> >> 2012-05-05 19:01 keltezéssel, Chris Barry írta: >> >> Greetings, >> >> I'm interested in hearing user accounts about using infiniband as the >> storage interconnect with OpenNebula if anyone has any thoughts to share. >> Specifically about: >> * using a shared image and live migrating it (e.g. no copying of images). >> * is the guest unaware of the infiniband or is it running IB drivers? >> * does the host expose the volumes to the guest, or does the guest >> connect directly? >> * I'd like to avoid iSCSI over IPoIB if possible. >> * clustering filesystem/LVM requirements. >> * file-based vdisk or logical volume usage? >> >> Anything, an experiences at all will be helpful. >> >> Thanks >> Christopher >> >> >> >> _______________________________________________ >> Users mailing >> [email protected]http://lists.opennebula.org/listinfo.cgi/users-opennebula.org >> >> >> >> >> _______________________________________________ >> Users mailing list >> [email protected] >> http://lists.opennebula.org/listinfo.cgi/users-opennebula.org >> >> >
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