# [OmniOS-discuss] Slow NFS writes in 151026

Doug Hughes doug at will.to
Thu Aug 23 19:19:44 UTC 2018

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    Out of curiosity, if you disable the zil through the evil zfs tuning
    wiki mechanisms (diagnostic purposes only), does it dramatically help?

    If not, there's something else going on, if yes, it could be that the
    l2arc and zil are interfering with each other (I could imagine that the
    l2arc is causing a lot of need for erasing of blocks on the SSD which
    could be dramatically slowing things down. I haven't been following the
    implementation of TRIM support and any outstanding issues)

    On 8/23/2018 1:39 PM, Lee Damon wrote:
    > Do you mean c0t55CD2E414EC0FF43d0?
    >
    > It's an SSD. It just has a long name because it's in a hotswap sled
    > instead being inside the chassis.
    >     Hardware properties:
    >                 name='devid' type=string items=1
    >                     value='id1,sd at n55cd2e414ec0ff43'
    >                 name='class' type=string items=1
    >                     value='scsi'
    >                 name='inquiry-revision-id' type=string items=1
    >                     value='0121'
    >                 name='inquiry-product-id' type=string items=1
    >                     value='INTEL SSDSC2KG48'
    >                 name='inquiry-vendor-id' type=string items=1
    >                     value='ATA'
    >                 name='inquiry-device-type' type=int items=1
    >                     value=00000000
    >                 name='pm-capable' type=int items=1
    >                     value=00000001
    >                 name='compatible' type=string items=4
    > value='scsiclass,00.vATA.pINTEL_SSDSC2KG48.r0121' +
    > 'scsiclass,00.vATA.pINTEL_SSDSC2KG48' + 'scsiclass,00' + 'scsiclass'
    >                 name='client-guid' type=string items=1
    >                     value='55cd2e414ec0ff43'
    > nomad
    >
    > On Thu, Aug 23, 2018 at 10:35 AM Bob Friesenhahn
    > <bfriesen at simple.dallas.tx.us <mailto:bfriesen at simple.dallas.tx.us>>
    > wrote:
    >
    >     Lee,
    >
    >     Just in case you did not see my follow-up post, it looks like
    >     there is
    >     an error in your pool configuration that a large spinning disk was
    >     added as a log device rather than a SSD as was intended. Luckily it
    >     should be possible to fix this without restarting the pool from
    >     scratch.
    >
    >     Bob
    >     --
    >     Bob Friesenhahn
    >     bfriesen at simple.dallas.tx.us
    >     <mailto:bfriesen at simple.dallas.tx.us>,
    >     http://www.simplesystems.org/users/bfriesen/
    >     GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
    >
    >
    >
    > _______________________________________________
    > OmniOS-discuss mailing list
    > OmniOS-discuss at lists.omniti.com
    > http://lists.omniti.com/mailman/listinfo/omnios-discuss

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