Use Intel P4600 NVMe 2TB as both SLOG and L2ARC

Discussion in 'FreeBSD and FreeNAS' started by gpastor, Oct 14, 2019.

  1. gpastor

    gpastor New Member

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    Hi,

    We are planning a new virtualization deployment for a customer. Virtualization hosts will be VMware 6.7 and storage array will be a shiny new Lenovo ThinkSystem SR650 which has an Intel P4600 NVMe 2TB (fixed configuraton from our provider, I can't chage that). I'm planning to make 2 partitions and use them as a SLOG and L2ARC respectively.

    Is there any downside in having both SLOG and L2ARC on the same NVMe disk? Obviously if I had two separate devices for SLOG and L2ARC, performance will be better, but as I said, unfortunately I can't change that.

    ¿Have you any experience on this? ¿Any suggestions to better use this NVMe drive?

    Thanks
     
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    Last edited: Oct 14, 2019
  2. gea

    gea Well-Known Member

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    This would work and the P4600 would make a decent Slog/L2Arc.

    The but is the price and the waste of space. Slog needs no more than 10-20 GB and L2Arc does not help much with enough RAM and should not be larger than 5-10x RAM.

    With P4600 I would try to get a second one to build a Raid-1/10 Pool or use them as a special vdev to place metadata and some filesystem onto, see https://forums.servethehome.com/ind...ocation-classes-performance-benchmarks.26111/

    An Intel 4801X -200 is faster (or the Optane 900 if you do not need guaranteed PLP), mabay even the 100GB Optane is on par.
     
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  3. T_Minus

    T_Minus Moderator

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    Agreed, would go with 2xP4600 and 1x Optane :D
     
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  4. gpastor

    gpastor New Member

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    Hi, gea
    Never tried to do this before, just wanted to be sure.

    Caching metadata is an interesting idea, sure I will dig deeper in to this.

    We will get an Optane 900 for the next Freenas server for our company. Looking forward to putting my hands on it! :)

    Thanks!
     
    #4
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