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.<br><br>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?<br>
<br>Guess I have a lot to read :)<br><br>Thanks<br>-C<br><br><div class="gmail_quote">On Sat, May 5, 2012 at 5:23 PM, Chris Barry <span dir="ltr"><<a href="mailto:cbarry@rjmetrics.com" target="_blank">cbarry@rjmetrics.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi Gubda,<br><br>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.<br>
<br>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.<br>
<br>Thanks again,<br>-C<div class="HOEnZb"><div class="h5"><br><br><div class="gmail_quote">On Sat, May 5, 2012 at 4:01 PM, Guba Sándor <span dir="ltr"><<a href="mailto:gubasanyi@gmail.com" target="_blank">gubasanyi@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
Hi<br>
<br>
I'm using InfiniBand to make shared storage. My setup is simple: the
opennebula installdir is shared on NFS with the worker nodes. <br>
<br>
- 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.<br>
<br>
- 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.<br>
<br>
2012-05-05 19:01 keltezéssel, Chris Barry írta:
<blockquote type="cite"><div><div>Greetings,<br>
<br>
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:<br>
* using a shared image and live migrating it (e.g. no copying of
images).<br>
* is the guest unaware of the infiniband or is it running IB
drivers?<br>
* does the host expose the volumes to the guest, or does the guest
connect directly?<br>
* I'd like to avoid iSCSI over IPoIB if possible.<br>
* clustering filesystem/LVM requirements.<br>
* file-based vdisk or logical volume usage?<br>
<br>
Anything, an experiences at all will be helpful.<br>
<br>
Thanks<br>
Christopher<br>
<br>
<br>
<fieldset></fieldset>
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