• This topic has 5 replies, 3 voices, and was last updated July 20, 2018 by Ron F.

Limit to number of Shadow VRA's (VRAH)?

  • Ron F
    July 19, 2018 10:18:55 PM

    Hello,

    We frequently have shadow VRA’s on hosts in our recovery site clusters. Anybody know if there is a limit to the number of Shadow VRA’s that Zerto will spawn? We have some clusters with larger hosts and am wondering if there is a limit to the number of VRAH’s that Zerto will create?

    Chris S
    July 20, 2018 12:01:03 PM

    My understanding (as a customer) is that the VRAH machines spin up due to a VMWare limitation in the number of VMDK’s that can be attached to a single VM. Once that limit is reached on the VRA, it will spin up a VRAH to handle to load. Conversely, when the VRAH is no longer needed, it will remove itself automatically. I think it’s pretty hands off from what I’ve observed. When it’s needed, it spins up, when it’s not, it removes itself.

    Hope that helps.

    Ron F
    July 20, 2018 03:10:56 PM

    The limitation is due to SCSI itself not VMware. The VRA’s have 4 controllers with a max of 15 disks per, an age old SCSI limitation. I’m just curious if we exceed that on a VRAH will it spin up VRAH2 if you will.

    Chris S
    July 20, 2018 03:12:36 PM

    Ahh yes, good old scsi. Good call. Sounds like a question for Zerto support.

    Lee L
    July 20, 2018 07:47:54 PM

    I haven’t run into a limit myself, I’ve seen some of my recovery hosts with 4 Z-VRAH VMs.

    Ron F
    July 20, 2018 08:05:25 PM

    Awesome thanks for the reply Connie

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