# [OmniOS-discuss] OmniOS backup box hanging regularly

Hildebrandt, Bill bhildebrandt at exegy.com
Fri Oct 23 16:57:55 UTC 2015

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    It's a 4U direct-attached backplane . . . not an expander.  Each drive requires its own connection.

    The zdb -bbccsv of my exported pool just finished and without error this time.

    Dump is still available if you would like to review it.

    -Bill

    -----Original Message-----
    From: Dan McDonald [mailto:danmcd at omniti.com]
    Sent: Friday, October 23, 2015 10:24 AM
    To: Hildebrandt, Bill
    Cc: Yavor Tomov; jimklimov at cos.ru; OmniOS-discuss; Dan McDonald
    Subject: Re: [OmniOS-discuss] OmniOS backup box hanging regularly

    > On Oct 23, 2015, at 12:42 AM, Hildebrandt, Bill <bhildebrandt at exegy.com> wrote:
    >
    > Controllers:        2x LSI 9201-16i with SAS-SATA break-out cables going to a SAS846TQ backplane
    > System disk:       mirrored Innodisk 128GB SATADOMs (SATADOM-MV 3ME) off mobo
    > ZIL:                         mirrored Samsung SSD 845D (400GB) off mobo
    > L2ARC:                  SAMSUNG MZHPU512 (512GB PCIe)
    > NICs:                     Intel 10G (X520)
    > Data disks:          24x WD 1TB Enterprise SATA (WDC WD1002FBYS)

    SATA disks attached to a SAS expander (this is the SAS846TQ, an expander, right?) are known to be a dangerous deployment.  SATA doesn't have the reporting capabilities SAS does, and many SAS expanders don't relay SATA well enough.

    We do not support paying customers who deploy like this.

    FYI,
    Dan

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