In the office, we've elected to
whitebox go with a commodity approach to a certain class of server we'll eventually need a lot of. It's time to consider picking up a few more. It has been a year since the last time we did this, so I'm looking to update a few components.
Specifically, the RAID card.
When we built these the first time around, we used the Adaptec 6805 card which uses SFF-8087 cables internally. This was fine, since the chassis they were going into also had that kind of socket. Worked great, nice big brick, haven't had a problem with them ever.
I see their 7x and 8x series are out now, but they're using SFF-8643. The 7x series is the same 6Gb SAS as the 6x series, but they're using the 12Gb/s cable for some reason.
I'm not thinking of the 8x series since I can't do 12Gb SAS yet, but the 7x series is a possibility. However, it uses a different cable.
- Are SFF-8643 cables like USB3 cables vs USB2 in that they're backwards compatible to the lower spec?
- Are SFF-8643 cables more like OM3 cables vs OM2, in that they're the same cable just made to a higher spec (and thus compatable)?
- Or are SFF-8643 cables electrically and pinned differently so they're Not At All The Same Thing?