topic Re: FAS2552 Fibre Channel Slowly Speed to Dell Vmware in ONTAP Hardware

FAS2552 Fibre Channel Slowly Speed to Dell Vmware

grax — Wed, 04 Jun 2025 12:39:22 GMT

Hello! I have a problem with disk read/write via FC (NetAPP Fas 2552 and Vmware Dell R640).

I have 2 channels FC online 8gbps - connections are ok. If i Power on some Virtual Machine (Windows 2019 Server) it`s start very slowly and on working Console (start Internet Explorer etc) a long time...

What is the reason?

To storage are connected 2 other servers via FC too.

Here my Test Speed on Windows Server 2019 Virtual Machine:

Help me pls 😕 It`s correct speed?

Re: FAS2552 Fibre Channel Slowly Speed to Dell Vmware

cedric_renauld — Wed, 10 Apr 2019 07:03:44 GMT

Hi Grax,

I've some questions for you 🙂

- Wath's your vSphere version ?

- How many disk have you in your NetApp ?

- This disk are shared betwen the 2 controlers ?

- Your VMDK arent in Thin provisioning ?

Thanks

Re: FAS2552 Fibre Channel Slowly Speed to Dell Vmware

grax — Wed, 10 Apr 2019 07:08:55 GMT

- vSphere 6.7U1

- 12disks SAS and 12disks NLSAS

- Yes, i have 2 controllers

- Yes Thin provisioning

Re: FAS2552 Fibre Channel Slowly Speed to Dell Vmware

grax — Fri, 12 Apr 2019 15:31:13 GMT

I have 2x 16Gb Fibre Channel GBIC

Look read speed is ok but write no.

I don`t know why 😕 Who help me?

Re: FAS2552 Fibre Channel Slowly Speed to Dell Vmware

cedric_renauld — Sat, 13 Apr 2019 05:21:18 GMT

Hummmm

I know the versions are not the same, but could you check tjis Vmware post :

https://communities.vmware.com/thread/564087

Dont forget th page's 2 of this