| ID | | Article Title | Post Date |
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737 | 
| I daisy-chained two DX800s and my drives don't show up. | Mar-08-18 |
| Sonnet DX800 had 3Gb SAS expanders (Model Number SON005 and previous) and some had 6Gb SAS expanders (Model Number SON0011 and later).
You may mix models if you connect one to each SAS controller port. You may daisy-chain units togerther of the same model in any order, but if you daisy-chain mixed models SON005 and SON0011, then model(s) SON005 must come earlier and model(s) SON0011 must come later in the daisy-chain.
The performance does not change much with the faster SAS expanders when you use only 8 drives, because the 8 lanes on the controller card connect directly to 8 drives in one chassis without SAS switching. However, the performance is measurable better with 6Gb over 3Gb SAS expanders when you connect two 6Gb units concurrently or daisy-chain 6Gb chassis. In order to raffect this performance increase, Sonnet phased in 6Gb internal SAS expanders. A consequence of this performance bump is that a 3Gb expander will not work behind the 6Gb expander in a chain, only the in front of it. A mixed configuration works as well as two 3Gb SAS expander chassis together. Unfortunately, the SAS expanders in the SON005 units cannot be upgraded because the backplane going to SON0011 changed also. The good news is that every valid configuration will generally run faster, and in no case slower than before. |
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