0PSU LogoLa recherche d'un bloc d'alimentation de serveur de stockage

I recently pos­ted abi­out my search for a new stor­age serv­er case. My next search involves find­ing a suit­able PSU! It seems in recent years it has got much harder to find the type of hard­ware I like to use, prob­ably because the fash­ion has been to go smal­ler and sleeker which is gen­er­ally more pos­sible in this era of improved per­form­ance-per-watt devices. cependant, if you have space and you want sys­tems to be cool, silencieux, and effi­cient then large is still the way to go.

My cur­rent serv­er has the excel­lent Cor­sair HX520 PSU que j'ai eu pour environ 10 ans. This mod­u­lar PSU a 5 AUX con­nect­ors which can take SATA ou des câbles Molex. Je suis supplémentaire SATA câbles et ont 1 câble molex et 4 SATA câbles qui me permet d'alimenter les deux ventilateurs (molex) et jusqu'à 16 lecteurs de disque dur (4 x 4 SATA câbles). I cur­rently have 12 SATA drives powered with a little bit of spare capa­city.

I would be very happy with anoth­er HX520 power sup­ply for my new serv­er but of course being a 10 year old design it is no longer avail­able, and I haven’t been able to find one second hand so I have been search­ing for some­thing equi­val­ent. The prob­lem is that mod­ern designs seem obsessed with provid­ing silly num­bers of GPU câbles d'alimentation (silly giv­en that a sig­ni­fic­ant major­ity of people use either 0 ou 1 processeurs graphiques, et très peu utilisent en effet 2, laisser seul 3!) mais beaucoup d'entre eux ont seulement 3 AUX con­nect­ors with even the reas­on­ably high power mod­els only offer­ing 4.

It is pos­sible to get mod­els with 5 or more AUX sock­ets but these are typ­ic­ally £200 or more for 1000W or more. My cur­rent serv­er pulls 125W at the sock­et so this sort of PSU would be com­plete overkill and would also be oper­at­ing at only 10% capa­city which is far below the optim­um effi­ciency. A 400W PSU would be far more suit­able (to give head­room for the syst­me under full load and for the drive spin up power draw at boot up).

One final frus­tra­tion is that even if I am able to find a much older mod­el second hand it is likely to be sig­ni­fic­antly less effi­cient that a mod­ern design. With the serv­er run­ning 24.7 effi­ciency does make a dif­fer­ence. Is it too much to ask to find a mod­ern equi­val­ent of the HX520 with an 80 plus l'or (or bet­ter) rat­ing for price of around £60?

Bare in mind there is a lot of mis­in­form­a­tion about the amount of power required for sys­tems with mul­tiple HDDs. Il y a un good thread on Super­User where some typ­ic­al fig­ures are giv­en and a sim­il­ar dis­cus­sion on Tom’s Hard­ware for­ums where a typ­ic­al example is giv­en…

  • WD Cavi­ar Black (WD2001FASS)
  • Star­tup Cur­rent +12V: 1.16 ampère
  • Star­tup Cur­rent +5V: 0.60 ampère
  • Star­tup Power (total): 16.92W
  • Lire écrire: 10.70 watts
  • Tourner au ralenti: 8.20 watts
  • Etre prêt: 1.30 watts
  • Sommeil: 1.30 watts

The total spin up power at 17W is fairly typ­ic­al. A WD Red utilise 15W 3 To.

Avec 16 of these drives there would be a max­im­um draw of 48W from the 5v line and 223W from the 12V line (271W au total). Même avec 125W a permis une CPU under full load and anoth­er 100W for the rest of the sys­tem, the total max­im­um power draw is still only 471W. And let’s remem­ber that the cpu and sys­tem will not be draw­ing max­im­um power at bootup time when the drives are at max­im­um. La dernière chose à vérifier est que le PSU can sup­ply enough power on the 5V line and 12v line as these each have a max­im­um rat­ing. Even my old Cor­sair HX520 can provide 24A at 5V which is a total of 120W (Basic sec­ond­ary school phys­ics les­sons will tell you that Power = Cur­rent x Voltage) which is 2.5x the demand of this hypo­tet­ic­al 16-drive sys­tem.

In fact the area I would have to be care­ful of (if I did­n’t have staggered spin up) est que mon ancien a HX520 3 12V lines which each have a max­im­um sup­ply of 18A which means 216W. Seulement 1 de ceux-ci est utilisé pour la puissance d'entraînement si j'ai essayé à tourner 16 HDDs sim­ul­tan­eously I would be slightly over my power budget. Bien sûr, je n'ai spin-up décalée et je ne 10 spin­ning-rust based drives so I am well with­in the lim­its. The les­son is clear though — in any build the lim­it­ing factor is more likely to be the max­im­um power provided per 12v line and not the total power the PSU est évalué pour. Once we know this it becomes appar­ent that there really is no need for a kilo­watt PSU for this sort of sys­tem, but hav­ing staggered spin up is immensely valu­able and even with that, it is worth pay­ing atten­tion to the max­im­um rat­ing of each 12v line, and the max­im­um rat­ing for the 5v sup­ply. Most mod­ern PSU now use a single 12v line which can sup­ply 50A+ which solves this prob­lem.

It is worth not­ing that using “green” drives that like to go to sleep could cause issues if they all try to spin up at once. Si elles ne le font pas, alors vous obtiendrez un long délai de Reponse à chaque fois que le réveil! I recom­mend using NAS grade (or bet­ter) HDDs for a stor­age sys­tem of this kind. Some good inform­a­tion and graphs about start-up power are avail­able at 45Drives.com

My cur­rent serv­er has 12 lecteurs, 1 carte de raid, et 2 cartes de télévision. It typ­ic­ally draws about 125W at the sock­et, with all the drives spin­ning and the TV stream­ing. No doubt if I ham­mer the serv­er it will go high­er, but for a glor­i­fied NAS a kilo­watt power sup­ply is utterly overkill. L'élément clé de la montre est le pouvoir en tirer si vous ne disposez pas de spin-up décalé activé (which you can prob­ably only enable with a RAID carte). J'ai jusqu'à spin décalée, et 2 de mon 12 les disques sont disques SSD qui n'ont pas le spin up question. Assum­ing the new serv­er also draws around 125W then a 500W PSU sera à 25% charge, tandis qu'un 1000W PSU sera à 12.5% charge. Giv­en an equal 80 plus rat­ing the 500W PSU is almost cer­tain to be more effi­cient at this load, as well as being a reas­on­able price to start with.

J'ai eu un bon aperçu de la marque principale PSU man­u­fac­tur­ers (Cor­sair, Season­ic, EVGA, antec, FSP, Bequiet, Sil­ver­stone, Thermal­take, Cool­er­Mas­ter, XFX, fractal design, Ener­max) et fait la liste ci-dessous de la plus approchante. Most man­u­fac­tur­ers don’t offer any­thing at all below 650W with 5 or more aux con­nect­ors. I’ve included a 750W Cor­sair as I’ve seen it on offer at a sim­il­ar price to 650W mod­els fre­quently.

Pos­sible new mod­els

  • Cor­sair RM750 (750W; £ 75; 80+ or)
  • EVGA Super­NOVA 650 G + (650W; £ 85; 80+ or)
  • EVGA 650 BQ (650W; £ 74; 80+ bronze)

Jusqu'à présent, la PSU’s I am aware of to search for second hand are…

  • Cor­sair HX520
  • Cor­sair HX620
  • Cor­sair HX550
  • Cor­sair HX650
  • Season­ic 660XP2
  • Season­ic 650KM3

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