HGST 4TB HUS726040AL5210 SAS Drives

Discussion in 'Great Deals' started by Robert Fontaine, Aug 9, 2018.

  1. Robert Fontaine

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    #1
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  2. BLinux

    BLinux Well-Known Member

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    indeed. except there's also sale tax for CA buyers, but very low use.
     
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  3. fohdeesha

    fohdeesha Well-Known Member

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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
     
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  4. realtomatoes

    realtomatoes Active Member

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    who was the bad seller you ran into?
     
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  5. fohdeesha

    fohdeesha Well-Known Member

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    #5
  6. JDMWAAAT

    JDMWAAAT New Member

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    I bought 16 of these last week, and they will be here tuesday. I'll try to update ya'll on what happens.
     
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  7. NobleX13

    NobleX13 Member

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    You seem to infiltrate all my favorite places. :) Next thing I know you will be on [H] too. Do keep us posted.
     
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  8. JDMWAAAT

    JDMWAAAT New Member

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    [H] is a love / hate relationship for me. STH and my community are all love :)
     
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  9. wildpig1234

    wildpig1234 Active Member

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    #9
  10. JDMWAAAT

    JDMWAAAT New Member

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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.
     
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  11. wildpig1234

    wildpig1234 Active Member

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    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/
     
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  12. Cipher

    Cipher Member

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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?
     
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  13. BLinux

    BLinux Well-Known Member

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    @Cipher because current magnetic spindle drives cannot exceed the bandwidth of 6Gbps (SAS-2 or SATA-3).
     
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  14. JDMWAAAT

    JDMWAAAT New Member

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    #14
  15. Cipher

    Cipher Member

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    Thank you, that makes sense!

    Are there any advantages to HGST including the 12Gb/s interface on these SAS drives?
     
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  16. Samir

    Samir Active Member

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    Same advantage to using a gigabit connection when you're only using 100Mbps of bandwidth--just more overhead to max it out imo.
     
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  17. andy

    andy Member

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    The REAL benefit is that sas has dual path support, so you can "split" a drive between 2 hosts/controllers unlike sata
     
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  18. wildpig1234

    wildpig1234 Active Member

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    why would you want to do that?
     
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  19. Samir

    Samir Active Member

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    Useful for multi-host multi-drive setups.
     
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  20. BLinux

    BLinux Well-Known Member

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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.)
     
    #20
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