Problem with Hyper-V Sync Speed

SolutionITdr 96 Reputation points
2021-05-03T18:54:08.657+00:00

Hello,

i added an Hyper-V Replication Server (HP DL380 G8 2x E5-2680 + 512GB RAM - 10GBit SFP+ - 7x5TB SATA drives (RAID5) - yes, it's not the newest Server, but good)

in same moment i added 10GBit Cards to all other Hyper-V-Hosts - connected to HP Arruba Switch.

everything working first (so that's what i thought) - started first replication syncs - LAN going up 5GBit on Replication Host.

after some minutes LAN drops down to some MBit or 0 - sync still running, but now RAM is growing and growing (up to 270GB)

in the same moment when i do a Hard disk benchmark the speed is very unclear sometimes just 20MB/s for 32KB-128KB Size i/o - and for 256KB and above still 4-5GB/s

nothing special in eventlog.

it depends to all 3 Hyper-V Host, so i think the problem will be on the Replication Host or Network - but i don't loose connection to it, so i don't think it's the network.

so my thought will be something with RAID - but don't know where to start - already recreated RAID with 64kb Stripe Size - to Test, and restart procedure - but same here. first Sync no problem, second also OK, after 15 Min the first will sync difference, and RAM growing, LAN speed from 2,4GBit to 10Mbit - and this is it - never getting better again.

don't know where to start - would be fine if someone can help :)

all Hosts are DL360 G9 - 256GB RAM - SSDs RAID5 and 2x 2690v4 with Server 2019 Std. - working great (for my luck)

Hyper-V
Hyper-V
A Windows technology providing a hypervisor-based virtualization solution enabling customers to consolidate workloads onto a single server.
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  1. SolutionITdr 96 Reputation points
    2021-05-11T17:22:10.087+00:00

    instead of RAID5 i created RAID10 - i don't know if this really was the problem - got the error once again, but after that everything was fine.

    so as expected the hardware / software combination was not the problem

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  1. Dave Patrick 330.7K Reputation points Microsoft MVP
    2021-05-03T18:59:58.527+00:00

    all Hosts are DL360 G9 - 256GB RAM - SSDs RAID5 and 2x 2690v4 with Server 2019 Std

    Seems problematic running Server 2019
    https://www.windowsservercatalog.com/item.aspx?idItem=e6e64720-a019-5a69-f56d-a78cfbbbcc76&bCatID=1282

    Might want to ask in the HP forums for help with this older hardware.

    --please don't forget to Accept as answer if the reply is helpful--

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  2. SolutionITdr 96 Reputation points
    2021-05-03T19:02:55.987+00:00

    i'm pretty sure that's not the problem... but yes, it's an easy answer...

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  3. Dave Patrick 330.7K Reputation points Microsoft MVP
    2021-05-03T19:08:10.557+00:00

    Unsupported hardware can be problematic and produce unexpected results. It doesn't mean it can't or won't work but does mean all of the testing / vetting of components that the hardware / server manufacturer's normally do is left to the end user to do. In the end, regardless of the outcome, you'll still be left with an unsupportable system.

    --please don't forget to Accept as answer if the reply is helpful--

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