[SPDK] Re: SPDK Controller create failure

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Hi Niranjan,

The default max number of subsystems is set to 1024, please use nvmf_set_ma=
x_subsystems RPC to modify it.

Could you double check if you've encountered the issue after 1024 or 1025 c=
ontrollers ? If there is an off-by one error somewhere here, please report =
it to https://github.com/spdk/spdk/issues.

Thanks,
Tomek

> -----Original Message-----
> From: N K Das <nkdas5544(a)gmail.com>
> Sent: Tuesday, October 18, 2022 12:45 PM
> To: spdk(a)lists.01.org
> Subject: [SPDK] SPDK Controller create failure
> =

> Hi,
> I was trying to create  1024 SPDK controller with 1 NS attached to each S=
PDK
> controller. It creates upto 1023 SPDK controller but fails at 1024. Is th=
ere any
> limitation on how many SPDK controller we can create in a single Linux se=
rver
> ? I am using Ubuntu 20.04 Linux Server.
> =

> Here is screenshot of error message:
> =

> [2022-10-18 10:22:13.343807] nvmf_rpc.c: 416:rpc_nvmf_create_subsystem:
> *ERROR*: Unable to create subsystem nqn.2016-06.io.spdk:cnode1023
> request:
> {
>   "nqn": "nqn.2016-06.io.spdk:cnode1023",
>   "serial_number": "SPDK0000000001023",
>   "model_number": "SPDK_Controller1023",
>   "allow_any_host": true,
>   "method": "nvmf_create_subsystem",
>   "req_id": 1
> }
> Got JSON-RPC error response
> response:
> {
>   "code": -32603,
>   "message": "Unable to create subsystem nqn.2016-06.io.spdk:cnode1023"
> }
> + exit
> =

> Any help is appreciated.
> =

> Regards,
> Niranjan
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