<div dir="ltr"><div>Hello List,<br><br></div><div>my aim is to host multiple <span style="background:none repeat scroll 0% 0% yellow" class="">VMs</span> which are redundant and are high available. It should also scale well.<br>
<br></div><div>I think usually people just buy a fat <span style="background:none repeat scroll 0% 0% yellow" class="">iSCSI</span> Storage and attach this. In my case it should scale well from very small nodes to big ones.<br>
</div><div>Therefore an <span style="background:none repeat scroll 0% 0% yellow" class="">iSCSI</span> Target will bring a lot of overhead (10GBit Links and two Paths, and really i should have a 2nd Hot Standby SAN, too). This makes scalability very hard.<br>
<br>This post is also not meant to be a <span style="background:none repeat scroll 0% 0% yellow" class="">iscsi</span> discussion.<br><br></div><div>Since <span style="background:none repeat scroll 0% 0% yellow" class="">oVirt</span> does not support <span style="background:none repeat scroll 0% 0% yellow" class="">DRBD</span> out of the box i came up with my own concept:<br>
</div><div><br><a href="http://oi62">http://oi62</a>.<span style="background:none repeat scroll 0% 0% yellow" class="">tinypic</span>.com/2550xg5.<span style="background:none repeat scroll 0% 0% yellow" class="">jpg</span><br>
<br></div><div>As far as i can tell i have the following advantages:<br></div><div>--------------------------------------------------------------------<br>- i can start with two simple cheap nodes<br></div><div>- i could add more disks to my nodes. Maybe even a <span style="background:none repeat scroll 0% 0% yellow" class="">SSD</span> as a dedicated <span style="background:none repeat scroll 0% 0% yellow" class="">drbd</span> resource.<br>
</div><div>- i can connect the two nodes directly to each other with bonding or <span style="background:none repeat scroll 0% 0% yellow" class="">infiniband</span>. i <span style="background:none repeat scroll 0% 0% yellow" class="">dont</span> need a switch or something between it.<br>
<br></div><div>Downside:<br>---------------<br></div><div>- i always need two nodes (as a couple)<br><br></div><div>Will this setup work for me. So far i think i will be quite happy with it.<br></div><div>Since the <span style="background:none repeat scroll 0% 0% yellow" class="">DRBD</span> Resources are shared in dual primary mode i am not sure if <span style="background:none repeat scroll 0% 0% yellow" class="">ovirt</span> can handle it. It is not allowed to write to a <span style="background:none repeat scroll 0% 0% yellow" class="">vm</span> disk at the same time.<br>
<br></div><div>The Concept of Linbit (<a href="http://www.linbit.com/en/company/news/333-high-available-virtualization-at-a-most-reasonable-price">http://www.linbit.com/en/company/news/333-high-available-virtualization-at-a-most-reasonable-price</a>) seems to much of an overhead with the iSCSI Layer and pacemaker setup. Its just too much for such a simple task.<br>
</div><div><br></div><div>Please tell me that this concept is great and will work and scale well.<br></div><div>Otherwise i am also thankful for any hints or critical ideas.<br><br><br>Thanks a lot,<br></div><div>Mario<br>
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