Redundancy in enterprise storage networks using dual-domain SAS ...
Redundancy in enterprise storage networks using dual-domain SAS ...
Redundancy in enterprise storage networks using dual-domain SAS ...
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
Dual-doma<strong>in</strong> <strong>SAS</strong><br />
Us<strong>in</strong>g <strong>dual</strong>-ported drives and <strong>dual</strong> controllers, or a controller capable of support<strong>in</strong>g <strong>dual</strong> doma<strong>in</strong>s,<br />
provides <strong>dual</strong>-path redundancy from the server. Figure 2 shows an example of a s<strong>in</strong>gle controller<br />
capable of <strong>dual</strong>-doma<strong>in</strong> support. The <strong>dual</strong>-doma<strong>in</strong> <strong>SAS</strong> configuration <strong>in</strong> Figure 2 can tolerate<br />
simultaneous s<strong>in</strong>gle port failure <strong>in</strong> a <strong>dual</strong>-port, <strong>dual</strong>-doma<strong>in</strong> capable controller, external cable failure,<br />
and expander failure.<br />
Figure 2. <strong>SAS</strong> <strong>dual</strong>-doma<strong>in</strong> <strong>SAS</strong> to JBOD <strong>storage</strong> network<br />
IO Module<br />
Server<br />
4<br />
Expander<br />
<strong>SAS</strong> drive<br />
Controller<br />
<strong>SAS</strong> drive<br />
4<br />
IO Module<br />
<strong>SAS</strong> drive<br />
Expander<br />
JBOD<br />
NOTE:<br />
Currently, the P800 controller provides <strong>dual</strong>-doma<strong>in</strong> support<br />
For additional <strong>in</strong>formation on Serial technology and how it makes <strong>dual</strong>-doma<strong>in</strong> <strong>SAS</strong> possible, see<br />
“Enabl<strong>in</strong>g technology” <strong>in</strong> Appendix B.<br />
4
Change language