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That shows why raid 6 should be used. I dont think you can recover much, but maybe try:

If you click the link, you'll see this: https://www.amazon.co.uk/gp/product/B01C86K4IG/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1

This one works in DSM 6.0, but i only use it to connect my UPS. I cannot tell you the performance.

This one works with DSM 6.0.

Yes, I did that, and used sataportmap=42 in grub.cfg More info: http://blog.chrispomfret.com/2013/07/31/allow-hot-plug-sata-and-5th-sata-port-full-speed-on-hp-n54l-proliant-microserver/

Change the ethernet cables.

synogeek: No, this card is here to stay; it gives me USB 3 and UPS compatibility support, plus I was not using the PCI slots. ordimans: Thanks for the links. However the post is old and refers to a lower DSM version. Unless someone posts the procedure for microservers and DSM 6, I would not want to break my install and lose access to my files. In short: if you have a free PCI slot, that card is not expensive and WORKS!!. Now I can wait for a new boot procedure for 6.1.

I just want to point out that this fix WORKS!: https://xpenology.com/forum/topic/6253-dsm-6xx-loader/?do=findComment&comment=68478

Debería funcionar, pero deberías tener una copia de seguridad por si acaso.

Creo que el DSM se almacena en una partición de todos los discos. Si dejas uno, arrancará.

The greatest problem now is the lack of UPS support, supposedly for the lack of USB 1 drivers.

What about this u-nas case?: http://www.u-nas.com/xcart/product.php?productid=17617

Yes, AHCI. I had recently a problem with an HP n54l not recognizing a disk because the second SATA controller was not in AHCI mode.

Just out of curiosity: how do you do that without losing all the data in your raid array?.

It seems amazon is not unlimited anymore....