Potentially BURNING HOT INFERNO deal 10TB HGST He10's

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wildpig1234

Well-Known Member
Aug 22, 2016
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but how are those 10tb going to rebuild if one drive fail?
in theory same as any other. except that it will take a long time . i guess if you have 20x disks vs 6x disks, i guess the probability of at least 1 disk fail would be greater out of 20 vs 6? still its just scary to see how amount of data loss can result from one disk down.
 

i386

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Mar 18, 2016
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RobertFontaine

Active Member
Dec 17, 2015
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zfs or something similar is clearly a requirement to recovering from a dead 10tb disk. I can't see this being a good buy for a homelab though. 5 x 2tb are going to be a lot more responsive and provide easier recovery.
 

Terry Kennedy

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Jun 25, 2015
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How insane would it be to go back to refrigerator-sized 5-ton HDDs consisting of 20x 4 foot diameter platters driven by a 10-hp motor using today's technologies spinning at 7.2k, 10K, or even 15K RPMs? Have it so you could repair them with ease and still keep them dust free. What capacity would that be? using 1.2Tbpsi? However you look at it, that would be ... Crazy!!!
It simply isn't possible, for a number of reasons. Assuming a somewhat more modern technology, like the CDC 9766 (12 x 14" platters, 3600 RPM, 300-ish MB), you have a couple of problems:
  • The outer edge of the platter, while still subsonic, is going to have a lot of flutter from air turbulence. 14" * π gets you a circumference of 44". 44 (") * 7200 (RPM) = 316.000 inches / minute, or 26,400 feet / minute. Which works out to 1,582,000 feet / hour or 300 miles/hour.
  • Even at the low track densities of that era (400-ish TPI for the CDC 9766), repeatable and non-repeatable runout (spindle wobble) caused problems with off-track writes. TPI isn't often published for modern drives, but the Seagate Cheetah 10K.7 spec sheet says 165,000 tracks per inch, over 400 times that of the 9766.
Anyway, you get the point - it just isn't possible. Far more effective to gut the drive from the rack it is in and use the space for current-generation hard drives.
 

Boddy

Active Member
Oct 25, 2014
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If someone could expand on 'Rebuild Assist' that would be great!

According to the above documentation, you require ' a RAID controller supporting Rebuild Assist'.

Is this usually documented in RAID controller documentation?
Or do I assume a RAID controller post Aug 2013, when 'SCSI SBC-3 specification' or ''TPR-045 (Rebuild Assist) as part of the SATA 3.2 specification.' was adopted (or I look for these specifications) would support Rebuild Assist?

I guess Rebuild Assist would not work with software RAID like ZFS?
 

dm3

New Member
Oct 3, 2016
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I ended up rolling the dice and picking up 8 of these. SMART data shows between 80 and 130 hours of use, and 7 power cycles or so.

They have been run through a few smart short tests, with no errors, and currently I am putting all of them through a SMART Long test.

I've checked the Serial numbers and these were clearly a pull from a datacenter/storage component. No warranty is valid. Barring any errors, I'm feeling really good about the purchase. I was able to get a solid offer bidding for 8.
 
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Patrick

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Dec 21, 2010
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BTW here is my theory of what is going on. Month-end/ quarter-end I wonder if HGST is selling those 60-bay 8TB/ 10TB JBODs at a low price. Perhaps something that works out to $275-300/ 10TB drive. If that is the case, it explains why those new-ish 60-bay JBODs are on the market so inexpensively along with this quantity of 10TB hard drives.

Call it a theory but when I see a large quantity of $700+ HGST 10TB drives selling for less than half price and a large quantity of 60-bay JBODs available, it seems like that is a plausible storyline.
 

croakz

Active Member
Nov 8, 2015
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Also maybe competitor take outs. I've seen a vendor buy out a competitors storage to make a deal. Then that bought out storage goes to grey market resellers for super cheap.
 

dm3

New Member
Oct 3, 2016
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I finished my Extended scans of the disks. All 8 are squeaky clean. Definitely a good deal to jump on if any are left.
 

Churchill

Admiral
Jan 6, 2016
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Warranty 90 Days Serverpart Deals Warranty
PRODUCT CONDITION USED. LIKE NEW.


You'd need to buy extras just in case. N+1 scenario.