Re: RBD with iSCSI

[Nick Fisk <nick@xxxxxxxxxx>]

It’s a long shot, but check if librados is installed.

 

From: ceph-users [mailto:ceph-users-bounces@xxxxxxxxxxxxxx] On Behalf Of Daleep Bais
Sent: 11 September 2015 10:18
To: Jake Young <jak3kaj@xxxxxxxxx>; paul@xxxxxxxxxxxx
Cc: Ceph-User <ceph-users@xxxxxxxx>
Subject: Re: RBD with iSCSI

 

Hi Jake, Hello Paul,

 

I was able to mount the iscsi target to another initiator. However, after installing the tgt and tgt-rbd, my rbd was not working. Getting error message :

 

root@ceph-node1:~# rbd ls test1

rbd: symbol lookup error: rbd: undefined symbol: _ZTIN8librados9WatchCtx

 

I am using this node as target for iscsi initiator ( Ref : http://xo4t.mj.am/link/xo4t/n3pignm/1/0PtGZ2Pi9sIuwLcgmNuMvw/aHR0cDovL3RyYWNrZXIuY2VwaC5jb20vaXNzdWVzLzEyNTYz) and using other node in cluster to create pools and images.

 

root@ceph-node1:~# tgtadm --version

1.0.51

 

Paul, I will also check the option you have suggested.  Appreciate the suggestion!

 

Thanks.

 

Daleep Singh Bais

 

On Thu, Sep 10, 2015 at 7:57 PM, Jake Young <jak3kaj@xxxxxxxxx> wrote:

 

 

On Wed, Sep 9, 2015 at 8:13 AM, Daleep Bais <daleepbais@xxxxxxxxx> wrote:

Hi,

 

I am following steps from URL http://xo4t.mj.am/link/xo4t/n3pignm/2/vAKmezglc355K3PqM72TPw/aHR0cDovL3d3dy5zZWJhc3RpZW4taGFuLmZyL2Jsb2cvMjAxNC8wNy8wNy9zdGFydC13aXRoLXRoZS1yYmQtc3VwcG9ydC1mb3ItdGd0Lw   to create a RBD pool  and share to another initiator.

 

I am not able to get rbd in the backstore list. Please suggest.

 

below is the output of tgtadm command:

 

tgtadm --lld iscsi --op show --mode system           

System:

    State: ready

    debug: off

LLDs:

    iscsi: ready

    iser: error

Backing stores:

    sheepdog

    bsg

    sg

    null

    ssc

    smc (bsoflags sync:direct)

    mmc (bsoflags sync:direct)

    rdwr (bsoflags sync:direct)

Device types:

    disk

    cd/dvd

    osd

    controller

    changer

    tape

    passthrough

iSNS:

    iSNS=Off

    iSNSServerIP=

    iSNSServerPort=3205

    iSNSAccessControl=Off

 

 

I have installed tgt and tgt-rbd packages till now. Working on Debian GNU/Linux 8.1 (jessie)

 

Thanks.

 

Daleep Singh Bais

 

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Hey Daleep,

 

The tgt you have installed does not support Ceph rbd.  See the output from my system using a more recent tgt that supports rbd.

 

tgtadm --lld iscsi --mode system --op show

System:

    State: ready

    debug: off

LLDs:

    iscsi: ready

    iser: error

Backing stores:

    rbd (bsoflags sync:direct)

    sheepdog

    bsg

    sg

    null

    ssc

    rdwr (bsoflags sync:direct)

Device types:

    disk

    cd/dvd

    osd

    controller

    changer

    tape

    passthrough

iSNS:

    iSNS=Off

    iSNSServerIP=

    iSNSServerPort=3205

    iSNSAccessControl=Off

 

 

You will need a new version of tgt.  I think the earliest version that supports rbd is 1.0.42

 

http://xo4t.mj.am/link/xo4t/n3pignm/4/BIGXHfS2FIVWd9rlMmR4Dg/aHR0cHM6Ly9naXRodWIuY29tL2Z1aml0YS90Z3Q

 

 

 

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