A single cable in a SAS setup can actually carry multiple SAS connections (I know the SAS5E adapter (3Gbit/s, but also SAS) can do 4 SAS connections for a combined bandwidth of 12Gbit/s to an MD3000). It's very possible that a tape library doesn't support multiple SAS connections and therefor only uses a single SAS connection in that cable, leave the rest of them unused.
Maybe someone that's more familiar with SAS tape libraries can confirm this (my knowledge is based on SAN arrays).
Correct. The LED is amber due to the fact that the tape is only using 1 of the 4 channels. If you had a 1x4 cable and cabled 4 drives into the port you would then see the green LED.
Dev Mgr
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November 19th, 2010 06:00
A single cable in a SAS setup can actually carry multiple SAS connections (I know the SAS5E adapter (3Gbit/s, but also SAS) can do 4 SAS connections for a combined bandwidth of 12Gbit/s to an MD3000). It's very possible that a tape library doesn't support multiple SAS connections and therefor only uses a single SAS connection in that cable, leave the rest of them unused.
Maybe someone that's more familiar with SAS tape libraries can confirm this (my knowledge is based on SAN arrays).
DELL-Bob D
899 Posts
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November 19th, 2010 11:00
Correct. The LED is amber due to the fact that the tape is only using 1 of the 4 channels. If you had a 1x4 cable and cabled 4 drives into the port you would then see the green LED.
Bob
fzb
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November 22nd, 2010 01:00
thanks for the insight