HGST 4TB HUS726040AL5210 SAS Drives

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fohdeesha

Kaini Industries
Nov 20, 2016
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fohdeesha.com
I bought 7x of these last week to replace the 7 failed drives from my order from that nightmare seller last month. Just installed them and running badblocks as we speak. They all had less than 100hrs and less than 1tb written, seem good so far
 

realtomatoes

Active Member
Oct 3, 2016
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I bought 7x of these last week to replace the 7 failed drives from my order from that nightmare seller last month. Just installed them and running badblocks as we speak. They all had less than 100hrs and less than 1tb written, seem good so far
who was the bad seller you ran into?
 

JDMWAAAT

Owner, serverbuilds.net
Aug 15, 2016
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wildpig1234

Well-Known Member
Aug 22, 2016
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Yes, you definitely cannot use these drives with a SATA controller, such as the one on your motherboard. You need to attach them to a SAS controller. Typically you would either do this through a backplane or with 8482 breakout cables.
I got an adaptec 31605.... sadly only have the SATA breakout cables.. but the 31605 is an SAS/SATA controller so might still consider it. but then again maybe not seeing this:

https://forums.servethehome.com/ind...nterprise-6tb-sata-for-85-after-coupon.21440/
 

Cipher

Member
Aug 8, 2014
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One question I have about this family of drives is the difference between the SATA and SAS version. From their specs page (6TB & 5TB Hard Drive | Ultrastar 7K6000 | HGST), here are a couple of performance comparisons:

Sustained Transfer Rate (MB/sec, typ.)
SATA
(6Gb/s) - MB/s: 227 (6TB), 202 (<6TB) / MiB/s: 216 (6TB), 192
SAS (12Gb/s) - MB/s: 227 (6TB), 202 (<6TB) / MiB/s: 216 (6TB), 192

Seek Time (read, ms, typical)
SATA
(6Gb/s) - 7.6 (Read), 8.0 (Write)
SAS (12Gb/s) - 7.6 (Read), 8.0 (Write)

Any idea why the performance is rated the same even though the SATA drives are 6Gb/s and the SAS drives are 12Gb/s?
 

Samir

Post Liker and Deal Hunter Extraordinaire!
Jul 21, 2017
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HSV and SFO
Thank you, that makes sense!

Are there any advantages to HGST including the 12Gb/s interface on these SAS drives?
Same advantage to using a gigabit connection when you're only using 100Mbps of bandwidth--just more overhead to max it out imo.
 

andy

Member
Oct 10, 2016
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Thank you, that makes sense!

Are there any advantages to HGST including the 12Gb/s interface on these SAS drives?
The REAL benefit is that sas has dual path support, so you can "split" a drive between 2 hosts/controllers unlike sata
 

BLinux

cat lover server enthusiast
Jul 7, 2016
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I'm not 100% sure, so this is actually more of a question to someone who knows for sure.... but if you use exclusively SAS-3 HDDs on a SAS3 expander backplane, doesn't the link from backplane to HBA then able to provide 12Gbps (per SAS lane, so 4x SAS lanes means 48Gbps) of bandwidth between the backplane and HBA? Meaning, even if the individual HDDs can't saturate the 12Gbps SAS link, can the aggregate bandwidth of all HDDs in the backplane make use of the 48Gbps (6GB/sec) bandwidth from the backplane to HBA?

if the above is true, then another advantage of using SAS3 HDDs that can't saturate 12Gbps, is that it enables SAS3 backplane to operate at 12Gbps and provide broader aggregate bandwidth to the HBA while maintaining the advantage of an expander setup (simpler cabling, require less SAS ports/HBA cards, less power to power HBAs, etc.)