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Alex.Covecube

Successfully Enabled Port Multiplier on eSATA

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xerces8

1) The MicroServer's port multiplier (PM) support is command-based switching (CBS) only. This isn't "bad"; it's just not (quite) as good as it could be. The other mode of PM support is frame-based [aka FIS-based] switching (FBS), which is more time- and bandwidth-efficient. (Results below)

The table at https://ata.wiki.ker...rdware_features claims the AMD SB850 supports FBS.

Is it wrong? Or is there some "artificial" limitation in the microserver?

 

Regards,

David

Edited by xerces8

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UhClem

The table at https://ata.wiki.ker...rdware_features claims the AMD SB850 supports FBS.

Is it wrong? Or is there some "artificial" limitation in the microserver?

 

Regards,

David

The MicroServers use the AMD SB820M, which only has CBS. Interestingly, port multiplier support is not mentioned anywhere in the 140-page official documentation on the SB820M Southbridge [link]

 

However 6Gbps support is mentioned, but only in a power-consumption table where it is listed under a "High Power Consumption" heading. (I think it was only an extra watt. Too bad HP seems to have left it out of our baby's gene pool.)

 

--UhClem

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xerces8

Oops, I don't know why I looked at SB850 instread of SB820M.... my mistake.

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ziki

What are the practical differences between CBS and FBS?

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foxxiu7

Hi,

I want to share that I successfully enabled port multiplier on eSata back port on my HP N40L (4x 2TB HDD, 8GB RAM) following this guide: http://homeservershow.com/hp-proliant-n40l-microserver-build-and-bios-modification-revisited.html .

Then I connected Sharkoon 8-bay Raid Station configured to run in Clean Mode which requires working port multiplier on server side: http://www.sharkoon.com/?q=en/node/2217 . It's nice, robust, working out-of-the box but extremely loud, so keep it hidden.

So far I put there 2 hard disks Seagate Barracuda 7200.14 ST3000DM001, 3TB. I can see both disks independently as other disks residing inside the HP box - so it works and integrates perfectly.

Everything is managed by WHS2011 running on HP N40L and disks are combined into one pool controlled by StableBit DrivePool http://stablebit.com/DrivePool/Features

 

So far it all run perfectly!

Thank you all for this topic and information here.

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ikon

Thanks very much for posting back with your results. Glad to hear it's all working so well. And kudos to Joe_Miner for his guide.

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ziki

Hi,

I want to share that I successfully enabled port multiplier on eSata back port on my HP N40L (4x 2TB HDD, 8GB RAM) following this guide: http://homeservershow.com/hp-proliant-n40l-microserver-build-and-bios-modification-revisited.html .

Then I connected Sharkoon 8-bay Raid Station configured to run in Clean Mode which requires working port multiplier on server side: http://www.sharkoon.com/?q=en/node/2217 . It's nice, robust, working out-of-the box but extremely loud, so keep it hidden.

So far I put there 2 hard disks Seagate Barracuda 7200.14 ST3000DM001, 3TB. I can see both disks independently as other disks residing inside the HP box - so it works and integrates perfectly.

Everything is managed by WHS2011 running on HP N40L and disks are combined into one pool controlled by StableBit DrivePool http://stablebit.com/DrivePool/Features

 

So far it all run perfectly!

Thank you all for this topic and information here.

 

Nice, BTW how does your Sharkoon behaves when ading or removing drives? Cause i got the 5-bay drive, and every time i add or remove a drive the controller resets. Does the same happen to you?

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foxxiu7

Nice, BTW how does your Sharkoon behaves when ading or removing drives? Cause i got the 5-bay drive, and every time i add or remove a drive the controller resets. Does the same happen to you?

 

Didn't test it yet.

I just put 2 new disks at once and added them to StableBit drive pool without any issues. This solved my space constraint for coming time, I guess...

All in all my Sharkoon box is running some time already without breaks and with no problems. I'm happy with it.

Edited by foxxiu7

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wizzbang

I've done the bios mod, I can't see how I can build a 2TB array out of 2x1TB disks on ports 5 and 6.
Yes, 5 and 6 – ESATA and optical ports. Is it possible to build a hardware RAID array from those 2 ports?

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jmwills

If you MOD the BIOS, doesn't the RAID function go away?

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