Enterprise SSD "small deals"

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89giop

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Dec 4, 2020
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luckylinux said:
Worst case I guess you can just return it at you own Cost, and possibly incur some restocking Fee ?
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I'd have to check the terms with ebay global shipping and returns. The postage alone for one drive to Australia was about 45usd
 
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luckylinux

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Mar 18, 2012
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kapone said:
Yup. Most Supermicro PSUs > ~700w are less than 70-75% efficient when you're idling in the two digits. Even power hungry CPUs like the Ivy Bridge era, idle at less than 40w with a single CPU. Even with dual CPUs they idle ~78-80w (I've done extensive measurements over the years).

The SM "platinum" PSUs are only efficient in the 30-90% range, and generally in a homely setting, we don't drive them that way.
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That's why I always remove the Redundant PSU and in most Cases I'm replacing the PWS-920P-SQ with the PWS-501P-1R (500W) (for those with the PDU) or similar Wattage with Cables. Still a Transition Phase though ...
 
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luckylinux

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lopgok said:
All 80+ rated power supplies need to meet their efficiency goal at 20%, except for titanium which needs to meet the goal at 10%.

See the chart at 80 PLUS certification specifications and ratings | CLEAResult

Platinum needs to be 90% efficient at 20% load.
Titanium needs to be 90% efficient at 10% load.
That is for 115v rated power supplies.
I don't have 1U or 2U servers, so I buy reasonably efficient ATX power supplies. My biggest power supply in use an a 550w platinum unit I use for my 64 core EPYC milan system.
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Sure, but it doesn't say how fast the Efficiency drops below that Point (< 20%) :) .

Plus you'll have to add the Efficiency of the PDU to generate 5V and 3.3V.

Anyways, we are going [very] Off-Topic.
 
Fritz

Fritz

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For some time now I've been buying new SSD's from amazon. Just don't like the prices and the risk of used drives on eBay.
 
BackupProphet

BackupProphet

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Fritz said:
For some time now I've been buying new SSD's from amazon. Just don't like the prices and the risk of used drives on eBay.
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This is great for us that needs the enterprise features. I have had great success with 99% of the used SSD's I've bought from Ebay. However when we talk about hard drives the story is completely different. Most hard drives sold on Ebay by a random seller have some kind of defects. If I buy a lot of 10 hard drives from someone, I can be sure that 1-2 hard drives have major defects and 2-4 have minor defects. So paying slightly extra from reputable sellers as serverpartdeals is definitely worth it.
 
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89giop

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ca3y6 said:
would be curious thank you. My previous experience with IBM SAS were not good.
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I did a lot more research on these IBM drives after I pulled the trigger and wrorked out it was unlikely I could reformat one. (Thank you for pointing that out to me!). I ended up asking the seller if these were 512b otherwise I might want to refund them and then they just responded with "no 512b" followed by a refund.
 
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luckylinux

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tubeit said:
I have a g292-z20 (which is a power hog), removing one of the two power supplies lets me idle at around 270W instead of 290W.
I'm quite sure that most of it is the CPU frequency/voltage being lowered by the system (I have the P-state managed by Linux, but removing the PSU changes the frequency a bit), but probably also some efficiency gain by using a single PSU.
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That's NOT why the Power Drops by removing one PSU.

If you remove one PSU, you take away a "Offset" Power Consumption that every switching Power Supply (or any Power Supply for that Matter) has: Auxiliary Power Consumption. Controller, Fan, the switching Effect and the losses it Generates in MOSFETs, Inductors, Capacitors, etc.

Furthermore, at low Load (in %), the PSU is NOT very efficient. In particular below 10% but also between 10% and 20%. For the same Reason (you still have Auxiliary and Filter Currents).

So if you have 2 x PSU each operating at 10% the efficiency will be FAR below that of a single PSU (of the same Model) being operated at 20% Load. Similar story but even bigger change if you do 2 x 5% Load << efficiency of 1 x 10% Load. The story reverses to some extent at high load, where 2 x PSUs can be more efficient, but then we are talking about each PSU being operated at > 40 - 50% compared to a single PSU being operated at 60-100%, the latter of which has its own Set of Issues ;).

The efficiency curve follows (approximately) an inverted Parabola. Reality is more complex than that of course ;) .

Just one Example of many:
1755550094130.png
 
Fritz

Fritz

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Thank you sir. I'm going to check mine. I assumed it had the garbage firmware so I stopped using it. going to fire it up and check.
 
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Proliferation

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Found a potential deal for the Australians among us:
eBay.com.au - Cisco / Samsung PM893 7.68TB SATA SSD UCS-SD76T6S1X-EV
4x units listed @ 769 AUD each, or 699 with an eBay+ code

In the listing the photo is of a drive with a manufacturing date of 2022, though that may not apply to all of them- and no details are provided about their current health; also, and sorry for being ignorant on the topic, but was Cisco one of the vendors that locks down their drives/makes it a pain to update the firmware?
(Actually are these even usable in a non-Cisco system)
 
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89giop

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Proliferation said:
Found a potential deal for the Australians among us:
eBay.com.au - Cisco / Samsung PM893 7.68TB SATA SSD UCS-SD76T6S1X-EV
4x units listed @ 769 AUD each, or 699 with an eBay+ code

In the listing the photo is of a drive with a manufacturing date of 2022, though that may not apply to all of them- and no details are provided about their current health; also, and sorry for being ignorant on the topic, but was Cisco one of the vendors that locks down their drives/makes it a pain to update the firmware?
(Actually are these even usable in a non-Cisco system)
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They actually listed them at 679ea in the beginning and when i tried to haggle them down to 500 each they actaully jacked up the price ans said 679 was a pricing error ☹
 
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89giop

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89giop said:
I did a lot more research on these IBM drives after I pulled the trigger and wrorked out it was unlikely I could reformat one. (Thank you for pointing that out to me!). I ended up asking the seller if these were 512b otherwise I might want to refund them and then they just responded with "no 512b" followed by a refund.
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Looks like maybe they could have been reformatted to 512b....

ebay.us

Samsung 15.36TB PM1643 IBM 2.5" SAS SSD 12Gb/s MZILT15THMLA - 100% Health | eBay Australia

Find many great new & used options and get the best deals for Samsung 15.36TB PM1643 IBM 2.5" SAS SSD 12Gb/s MZILT15THMLA - 100% Health at the best online prices at eBay Australia!
ebay.us
This seller is reselling their drives and formatted as 512b. You can tell because they even left on the sticker from the previous seller. I also had the same sticker on all my 3.84tb drives I got from them.

This is a link to the 3.84TB they resold from the same seller.

ebay.us

Dell 3.84TB 2.5 in Internal SSD - N85XX for sale online | eBay Australia

Find many great new & used options and get the best deals for Dell 3.84TB 2.5 in Internal SSD - N85XX at the best online prices at eBay Australia!
ebay.us ebay.us
 
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