Re: [SPDK] spdk user mode initiator

[Kirubakaran Kaliannan <kirubak at zadarastorage.com>]

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Hi Gang,



I am on 3.18 kernel on initiator. I assume, I cannot use the nvme-cli
command on the initiator with 3.18 kernel. Right  (as this needs
nvme_fabrics driver !! )?

or am I missing some option in the command to expose the nvme devices
through spdk user-mode with out any support from the nvme kernel divers ?



Thanks

-kiru



*From:* SPDK [mailto:spdk-bounces(a)lists.01.org] *On Behalf Of *Cao, Gang
*Sent:* Friday, September 22, 2017 9:16 PM
*To:* Storage Performance Development Kit
*Subject:* Re: [SPDK] spdk user mode initiator



One thing is that you can try the nvme cli with SPDK support. Reference
here http://www.spdk.io/doc/nvme-cli.html



You can also use *nvme* *connect* command which through spdk user mode
initiator to connect the spdk nvme-of target and expose the /dev/nvmeX and
/dev/nvmeXn1 devices locally. Once these devices are listed, can run the
application on it.



If you have some issue when using SPDK supported nvme cli, please let us
know.



Thanks,

Gang



*From:* SPDK [mailto:spdk-bounces(a)lists.01.org <spdk-bounces(a)lists.01.org>] *On
Behalf Of *Kirubakaran Kaliannan
*Sent:* Friday, September 22, 2017 2:19 AM
*To:* Storage Performance Development Kit <spdk(a)lists.01.org>
*Subject:* Re: [SPDK] spdk user mode initiator





Just to cross check,  we need to build a plugin (to use the spdk SDK) for
the application we have and to compile it with the spdk to use it as the
initiator. Right ?



As I understand there is no traditional way of exposing the device for the
application to consume. Please confirm.



Thanks,

-kiru



*From:* Kirubakaran Kaliannan [mailto:kirubak(a)zadarastorage.com]
*Sent:* Friday, September 22, 2017 2:43 PM
*To:* 'Storage Performance Development Kit'
*Subject:* RE: [SPDK] spdk user mode initiator





Thanks Liu.



Now i can run perf test using

./perf -q 1 -s 1048576 -w read -M 100 -t 10 -r 'trtype:rdma adrfam:IPv4
traddr:10.3.7.2 trsvcid:4420 subnqn:nqn.2016-06.io.spdk:cnode1'



How can I import this as a block deivce (/dev/sd? Or /dev/nvme0?? Or some
other device format), so I can use this for the application locally ?





Thanks,

-kiru



*From:* SPDK [mailto:spdk-bounces(a)lists.01.org <spdk-bounces(a)lists.01.org>] *On
Behalf Of *Liu, Changpeng
*Sent:* Friday, September 22, 2017 10:42 AM
*To:* Storage Performance Development Kit
*Subject:* Re: [SPDK] spdk user mode initiator



Hi Kiru,



Yes, actually SPDK nvme library already support NVM-oF initiator, please
see examples/nvme/perf as an example.

It can connect local PCI NVMe or remote NVM-oF target.





*From:* SPDK [mailto:spdk-bounces(a)lists.01.org <spdk-bounces(a)lists.01.org>] *On
Behalf Of *Kirubakaran Kaliannan
*Sent:* Friday, September 22, 2017 12:57 PM
*To:* Storage Performance Development Kit <spdk(a)lists.01.org>
*Subject:* [SPDK] spdk user mode initiator





Hi,



We are evaluating the spdk-target with NVMf initiator (installing linux 4.9
only on the initator but 3.18 on the target).

This is good so for, and we do have customers don’t want to upgrade 3.18
kernel even on the initiator side.



So, Similarly do we have SPDK initiator (at user land) so I can have this
configured on 3.18 kernel ?

If we have one, any pointer to the documentation will help ?



Thanks

-kiru

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