LOL... okay, free servers are hard to pass up.
Well, my best advice would be to find somewhere to put these, far far away from humans.
Unfortunately you can't just unplug the fans and setup some alternate cooling system, because the server will see missing fans and start throwing errors.
Otherwise you could take all the fans out and point a portable AC unit right at it or something. The DL5xx models are even big enough that you *might* get away with liquid coolers on the CPU's, although mounting the radiators would be tricky to place with the off-the-shelf coolers. They don't always have the longest tubing. You'd probably be looking at one of the systems that routes the tubing outside the case entirely and has an external pump/radiator.
But you'd still need to have fans installed to avoid the errors... yeah, no good way around that, besides figuring out the pinout on the fan pins and faking it into thinking a fan is there, but there's also a speed sense so it knows how fast it's going, and that might need to be faked too.
The big problem is, anywhere you put this server to minimize the environmental noise is also probably going to mean shoving it in a closet or something with minimal air exchange, which will lead to overheating. If it weren't for that, you could wrap the thing in insulation and call it good; but it would melt in a few minutes. :)
The nearest example I can come up with of my own is an installation of a handful of servers that went into what used to be a tiny office, turned into a storage room, and then they threw some telco racks in there and made it a "server room".
It had zero ventilation once the door was closed, and if the door was open, it was too loud for people in other offices.
The "solution" was to get one of those portable AC units you can find at any big-box store, put that in the room and then run the exhaust of the AC unit up into the drop ceiling and just let it flood that space with the warm air.
It wasn't perfect, and those portable AC units also have a lovely side effect of dehumidifying, so I found myself checking the water in there each morning to empty out a few pints.
Once, I didn't check that water level for a couple days. It filled up, the AC shut off because it's water thing was full, and next thing you know that tiny room had an ambient temp of over 100 degrees F, which caused all the HP's to thermal shutdown and made the switches unhappy too.
We finally found a sweet spot on the portable AC of around 74 degrees F which was cool enough to keep the equipment happy and warm enough to keep it from dehumidifying, so it didn't normally condense anything. If we changed it even a couple degrees to 72, it would dehumidify... so it's a very fine line depending on your relative humidity. In the deep south or coastal areas with high humidity, you'd probably be dealing more with 80F or even higher... which is still tolerable for servers, though not ideal.
Well, my best advice would be to find somewhere to put these, far far away from humans.
Unfortunately you can't just unplug the fans and setup some alternate cooling system, because the server will see missing fans and start throwing errors.
Otherwise you could take all the fans out and point a portable AC unit right at it or something. The DL5xx models are even big enough that you *might* get away with liquid coolers on the CPU's, although mounting the radiators would be tricky to place with the off-the-shelf coolers. They don't always have the longest tubing. You'd probably be looking at one of the systems that routes the tubing outside the case entirely and has an external pump/radiator.
But you'd still need to have fans installed to avoid the errors... yeah, no good way around that, besides figuring out the pinout on the fan pins and faking it into thinking a fan is there, but there's also a speed sense so it knows how fast it's going, and that might need to be faked too.
The big problem is, anywhere you put this server to minimize the environmental noise is also probably going to mean shoving it in a closet or something with minimal air exchange, which will lead to overheating. If it weren't for that, you could wrap the thing in insulation and call it good; but it would melt in a few minutes. :)
The nearest example I can come up with of my own is an installation of a handful of servers that went into what used to be a tiny office, turned into a storage room, and then they threw some telco racks in there and made it a "server room".
It had zero ventilation once the door was closed, and if the door was open, it was too loud for people in other offices.
The "solution" was to get one of those portable AC units you can find at any big-box store, put that in the room and then run the exhaust of the AC unit up into the drop ceiling and just let it flood that space with the warm air.
It wasn't perfect, and those portable AC units also have a lovely side effect of dehumidifying, so I found myself checking the water in there each morning to empty out a few pints.
Once, I didn't check that water level for a couple days. It filled up, the AC shut off because it's water thing was full, and next thing you know that tiny room had an ambient temp of over 100 degrees F, which caused all the HP's to thermal shutdown and made the switches unhappy too.
We finally found a sweet spot on the portable AC of around 74 degrees F which was cool enough to keep the equipment happy and warm enough to keep it from dehumidifying, so it didn't normally condense anything. If we changed it even a couple degrees to 72, it would dehumidify... so it's a very fine line depending on your relative humidity. In the deep south or coastal areas with high humidity, you'd probably be dealing more with 80F or even higher... which is still tolerable for servers, though not ideal.