I have purchased two items that I want to mate:

• A SuperMicro motherboard: X10SL7-F
• A Seagate Enterprise SAS drive: ST6000NM0034

The motherboard seems to be somewhat unique in that it has eight (8) SAS/SATA connectors connected to an LSI 2308 SAS controller. The connectors are SATA-type rather than the (apparently more common) SFF-8087 connectors.

So far, I have attempted to mate these using an adapter that has a 22-pin SFF-8482 on the female side and a pair of standard SATA data and power connectors on the male side. From what I can tell, the only pin difference between the 22-pin SFF-8482 and the 29-pin SFF-8482 is the existence of the additional 7 pins in the middle that form the second SAS lane to support SAS3. Since my motherboard can only do SAS2, I assume that these pins would not be useful anyway.

Connectors

• On the motherboard: SATA data connector (7-pin)
• On the Seagate drive: 29-pin SFF-8482

• On the power supply: SATA power connector (15-pin)
• On the adapter: 22-pin SFF-8482, SATA data and power

What doesn't work?

• None of the four Seagate drives seem to spin up at all. It's like they have no power whatsoever. Each has its own 22-pin adapter, SATA data cable, and SATA power.

What works?

• The motherboard POSTs and seems generally happy
• To test, a WD Red Pro drive, which is SATA-based, spins up and is detected on a port owned by the LSI controller AND it is powered by the standard SATA power connector from the power supply.
• The LSI controller's option BIOS appears and reports the presence of the WD drive.
• There are two SATA power cables coming from the power supply. Both have been shown to work with the WD drive.

My assumptions

• My SAS3 drive is backward compatible with SAS2
• 29-pin SFF-8482 is backward compatible with the 22-pin SFF-8482, albeit at reduced performance
• 29-pin SFF-8482's 7 center pins (on the drive) need not be connected to anything
• 22-pin SFF-8482 is pin-identical to SATA data + SATA power
• A drive with good power will spin up regardless of its data connectivity

Are any of these assumptions invalid? I'm new to SAS, so please forgive my ignorance.

Update

The entire premise of this question is faulty because the solution described in it works after all. The fault lay with my power supply, which incorrectly supplies 3.3 volts to pin 3 of its SATA power connectors. See my answer below for details.

I have purchased two items that I want to mate:

• A SuperMicro motherboard: X10SL7-F
• A Seagate Enterprise SAS drive: ST6000NM0034

The motherboard seems to be somewhat unique in that it has eight (8) SAS/SATA connectors connected to an LSI 2308 SAS controller. The connectors are SATA-type rather than the (apparently more common) SFF-8087 connectors.

So far, I have attempted to mate these using an adapter that has a 22-pin SFF-8482 on the female side and a pair of standard SATA data and power connectors on the male side. From what I can tell, the only pin difference between the 22-pin SFF-8482 and the 29-pin SFF-8482 is the existence of the additional 7 pins in the middle that form the second SAS lane to support SAS3. Since my motherboard can only do SAS2, I assume that these pins would not be useful anyway.

Connectors

• On the motherboard: SATA data connector (7-pin)

• On the Seagate drive: 29-pin SFF-8482

  

• On the power supply: SATA power connector (15-pin)

• On the adapter: 22-pin SFF-8482, SATA data and power

  

What doesn't work?

• None of the four Seagate drives seem to spin up at all. It's like they have no power whatsoever. Each has its own 22-pin adapter, SATA data cable, and SATA power.

What works?

• The motherboard POSTs and seems generally happy
• To test, a WD Red Pro drive, which is SATA-based, spins up and is detected on a port owned by the LSI controller AND it is powered by the standard SATA power connector from the power supply.
• The LSI controller's option BIOS appears and reports the presence of the WD drive.
• There are two SATA power cables coming from the power supply. Both have been shown to work with the WD drive.

My assumptions

• My SAS3 drive is backward compatible with SAS2
• 29-pin SFF-8482 is backward compatible with the 22-pin SFF-8482, albeit at reduced performance
• 29-pin SFF-8482's 7 center pins (on the drive) need not be connected to anything
• 22-pin SFF-8482 is pin-identical to SATA data + SATA power
• A drive with good power will spin up regardless of its data connectivity

Are any of these assumptions invalid? I'm new to SAS, so please forgive my ignorance.

Update

The entire premise of this question is faulty because the solution described in it works after all. The fault lay with my power supply, which incorrectly supplies 3.3 volts to pin 3 of its SATA power connectors. See my answer below for details.

I have purchased two items that I want to mate:

• A SuperMicro motherboard: X10SL7-F
• A Seagate Enterprise SAS drive: ST6000NM0034

The motherboard seems to be somewhat unique in that it has eight (8) SAS/SATA connectors connected to an LSI 2308 SAS controller. The connectors are SATA-type rather than the (apparently more common) SFF-8087 connectors.

So far, I have attempted to mate these using an adapter that has a 22-pin SFF-8482 on the female side and a pair of standard SATA data and power connectors on the male side. From what I can tell, the only pin difference between the 22-pin SFF-8482 and the 29-pin SFF-8482 is the existence of the additional 7 pins in the middle that form the second SAS lane to support SAS3. Since my motherboard can only do SAS2, I assume that these pins would not be useful anyway.

Connectors

• On the motherboard: SATA data connector (7-pin)
• On the Seagate drive: 29-pin SFF-8482

• On the power supply: SATA power connector (15-pin)
• On the adapter: 22-pin SFF-8482, SATA data and power

What doesn't work?

• None of the four Seagate drives seem to spin up at all. It's like they have no power whatsoever. Each has its own 22-pin adapter, SATA data cable, and SATA power.

What works?

• The motherboard POSTs and seems generally happy
• To test, a WD Red Pro drive, which is SATA-based, spins up and is detected on a port owned by the LSI controller AND it is powered by the standard SATA power connector from the power supply.
• The LSI controller's option BIOS appears and reports the presence of the WD drive.
• There are two SATA power cables coming from the power supply. Both have been shown to work with the WD drive.

My assumptions

• My SAS3 drive is backward compatible with SAS2
• 29-pin SFF-8482 is backward compatible with the 22-pin SFF-8482, albeit at reduced performance
• 29-pin SFF-8482's 7 center pins (on the drive) need not be connected to anything
• 22-pin SFF-8482 is pin-identical to SATA data + SATA power
• A drive with good power will spin up regardless of its data connectivity

Are any of these assumptions invalid? I'm new to SAS, so please forgive my ignorance.

I have purchased two items that I want to mate:

• A SuperMicro motherboard: X10SL7-F
• A Seagate Enterprise SAS drive: ST6000NM0034

The motherboard seems to be somewhat unique in that it has eight (8) SAS/SATA connectors connected to an LSI 2308 SAS controller. The connectors are SATA-type rather than the (apparently more common) SFF-8087 connectors.

So far, I have attempted to mate these using an adapter that has a 22-pin SFF-8482 on the female side and a pair of standard SATA data and power connectors on the male side. From what I can tell, the only pin difference between the 22-pin SFF-8482 and the 29-pin SFF-8482 is the existence of the additional 7 pins in the middle that form the second SAS lane to support SAS3. Since my motherboard can only do SAS2, I assume that these pins would not be useful anyway.

Connectors

• On the motherboard: SATA data connector (7-pin)
• On the Seagate drive: 29-pin SFF-8482

• On the power supply: SATA power connector (15-pin)
• On the adapter: 22-pin SFF-8482, SATA data and power

What doesn't work?

• None of the four Seagate drives seem to spin up at all. It's like they have no power whatsoever. Each has its own 22-pin adapter, SATA data cable, and SATA power.

What works?

• The motherboard POSTs and seems generally happy
• To test, a WD Red Pro drive, which is SATA-based, spins up and is detected on a port owned by the LSI controller AND it is powered by the standard SATA power connector from the power supply.
• The LSI controller's option BIOS appears and reports the presence of the WD drive.
• There are two SATA power cables coming from the power supply. Both have been shown to work with the WD drive.

My assumptions

• My SAS3 drive is backward compatible with SAS2
• 29-pin SFF-8482 is backward compatible with the 22-pin SFF-8482, albeit at reduced performance
• 29-pin SFF-8482's 7 center pins (on the drive) need not be connected to anything
• 22-pin SFF-8482 is pin-identical to SATA data + SATA power
• A drive with good power will spin up regardless of its data connectivity

Are any of these assumptions invalid? I'm new to SAS, so please forgive my ignorance.

Update

The entire premise of this question is faulty because the solution described in it works after all. The fault lay with my power supply, which incorrectly supplies 3.3 volts to pin 3 of its SATA power connectors. See my answer below for details.

I have purchased two items that I want to mate:

• A SuperMicro motherboard: X10SL7-F
• A Seagate Enterprise SAS drive: ST6000NM0034

The motherboard seems to be somewhat unique in that it has eight (8) SAS/SATA connectors connected to an LSI 2308 SAS controller. The connectors are SATA-type rather than the (apparently more common) SFF-8087 connectors.

So far, I have attempted to mate these using an adapter that has a 22-pin SFF-8482 on the female side and a pair of standard SATA data and power connectors on the male side. From what I can tell, the only pin difference between the SFF-8482 and the SFF-8639 is the existence of the additional 7 pins in the middle that form the second SAS lane to support SAS3. Since my motherboard can only do SAS2, I assume that these pins would not be useful anyway.

Connectors

• On the motherboard: SATA data connector (7-pin)
• On the Seagate drive: SFF-8639 (29-pin)
• On the power supply: SATA power connector (15-pin)

What doesn't work?

• None of the four Seagate drives seem to spin up at all. It's like they have no power whatsoever. Each has its own 22-pin adapter, SATA data cable, and SATA power.

What works?

• The motherboard POSTs and seems generally happy
• To test, a WD Red Pro drive, which is SATA-based, spins up and is detected on a port owned by the LSI controller AND it is powered by the standard SATA power connector from the power supply.
• The LSI controller's option BIOS appears and reports the presence of the WD drive.
• There are two SATA power cables coming from the power supply. Both have been shown to work with the WD drive.

My assumptions

• My SAS3 drive is backward compatible with SAS2
• SFF-8639 is backward compatible with SFF-8482, albeit at reduced performance
• SFF-8639's 7 center pins (on the drive) need not be connected to anything
• SFF-8482 is pin-identical to SATA data + SATA power
• A drive with good power will spin up regardless of its data connectivity

Are any of these assumptions invalid? I'm new to SAS, so please forgive my ignorance.

I have purchased two items that I want to mate:

• A SuperMicro motherboard: X10SL7-F
• A Seagate Enterprise SAS drive: ST6000NM0034

The motherboard seems to be somewhat unique in that it has eight (8) SAS/SATA connectors connected to an LSI 2308 SAS controller. The connectors are SATA-type rather than the (apparently more common) SFF-8087 connectors.

So far, I have attempted to mate these using an adapter that has a 22-pin SFF-8482 on the female side and a pair of standard SATA data and power connectors on the male side. From what I can tell, the only pin difference between the 22-pin SFF-8482 and the 29-pin SFF-8482 is the existence of the additional 7 pins in the middle that form the second SAS lane to support SAS3. Since my motherboard can only do SAS2, I assume that these pins would not be useful anyway.

Connectors

• On the motherboard: SATA data connector (7-pin)
• On the Seagate drive: 29-pin SFF-8482

• On the power supply: SATA power connector (15-pin)
• On the adapter: 22-pin SFF-8482, SATA data and power

What doesn't work?

• None of the four Seagate drives seem to spin up at all. It's like they have no power whatsoever. Each has its own 22-pin adapter, SATA data cable, and SATA power.

What works?

• The motherboard POSTs and seems generally happy
• To test, a WD Red Pro drive, which is SATA-based, spins up and is detected on a port owned by the LSI controller AND it is powered by the standard SATA power connector from the power supply.
• The LSI controller's option BIOS appears and reports the presence of the WD drive.
• There are two SATA power cables coming from the power supply. Both have been shown to work with the WD drive.

My assumptions

• My SAS3 drive is backward compatible with SAS2
• 29-pin SFF-8482 is backward compatible with the 22-pin SFF-8482, albeit at reduced performance
• 29-pin SFF-8482's 7 center pins (on the drive) need not be connected to anything
• 22-pin SFF-8482 is pin-identical to SATA data + SATA power
• A drive with good power will spin up regardless of its data connectivity

Are any of these assumptions invalid? I'm new to SAS, so please forgive my ignorance.