> Are fibrechannel switches necessary? How does HA shared storage work?
>
> Typically, fibrechannel switches are not necessary. Multi-port shared
> storage for failover is normally configured to be shared between two server
> nodes on a FC-AL. Shared SCSI and future shared SATA devices will also
work.
>
>
> Backend storage is expected to be cache-coherent between multiple channels
> reaching the devices. Servers in an OSS failover pair are normally both
> active in the file system, and can be configured to take over partitions
for
> each other in the case of a failure. MDS failover pairs can also both be
> active, but only if they serve multiple separate file systems.
>
As far a I understand, Lustre is designed with the approach most cluster
file systems (except GlusterFS of course :) ), meaning you have master
servers that responsible for storage and retrieval of the data, and storage
nodes, which do actualy storage.
Regards.
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<div dir=3D"ltr">Hi.<br><br><div
class=3D"gmail_quote"><blockquote
class=3D"gmail_quote" style=3D"border-left: 1px solid rgb(204,
204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">It's
got similar speeds compared to gluster for a few nodes but depends on
fiberchannel or some other shared block storage system for redundancy. We
immediately discarded it in favor of gluster for this reason. It was also
significantly more difficult to get running as it was a kernel patch.<br>
</blockquote><div><br>Are you sure about that?
<br><br><br>From Lustre wiki (<a
href=3D"http://wiki.lustre.org/index.php?title=3DLustre_FAQ">http://wiki.lustre.org/index.php?title=3DLustre_FAQ</a>)<br><blockquote
style=3D"border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt
0.8ex; padding-left: 1ex;" class=3D"gmail_quote">
<h3>Are fibrechannel switches necessary? How does HA shared storage
work?</h3><p>Typically, fibrechannel switches are not necessary.
Multi-port
shared storage for failover is normally configured to be shared between
two server nodes on a FC-AL. Shared SCSI and future shared SATA devices
will also work.
</p><p>Backend storage is expected to be cache-coherent between
multiple channels reaching the devices. Servers in an OSS failover pair
are normally both active in the file system, and can be configured to
take over partitions for each other in the case of a failure. MDS
failover pairs can also both be active, but only if they serve multiple
separate file systems.
</p></blockquote>
<br>As far a I understand, Lustre is designed with the approach most
cluster file systems (except GlusterFS of course :) ), meaning you have master
servers that responsible for storage and retrieval of the data, and storage
nodes, which do actualy storage.<br>
<br>Regards.<br></div></div></div>
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