NFS over CEPH - best practice

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It's easy to install tgtd with ceph support. ubuntu 12.04 for example:


Connect ceph-extras repo:
echo deb?http://ceph.com/packages/ceph-extras/debian?$(lsb_release -sc) main | sudo tee /etc/apt/sources.list.d/ceph-extras.list


Install tgtd with rbd support:
apt-get update
apt-get install tgt

It's important to disable the rbd cache on tgtd host. Set in /etc/ceph/ceph.conf:
[client]
rbd_cache = false

Define permanent export rbd with iscsi in /etc/tgt/targets.conf:

<target iqn.2014-04.rbdstore.example.com:volume512>
? ? driver iscsi
? ? bs-type rbd
? ? backing-store iscsi/volume512
? ? initiator-address 10.166.18.87
</target




service tgt reload


Or use commands:


tgtadm --lld iscsi --mode logicalunit --op new --tid 1 --lun 1 --backing-store iscsi/volume512 --bstype rbd



	

tgtadm -C 0 --lld iscsi --op bind --mode target --tid 1 -I 10.166.18.87

?


tgt-admin -s
show current iscsi settings and sessions.





You can install tgtd on multiple osd/monitor hosts and connect iscsi initiator to this servers with multipath enabled. ?Iscsi proxy servers not needed with tgtd.

?

On Thu, May  8, 2014 at 12:20 AM, Sergey Malinin<hell at newmail.com>, wrote:


                    http://www.hastexo.com/resources/hints-and-kinks/turning-ceph-rbd-images-san-storage-devices
                

                

                 
                On Wednesday, May 7, 2014 at 15:06, Andrei Mikhailovsky wrote:

                
                    



Vlad, is there a howto somewhere describing the steps on how to setup iscsi multipathing over ceph? It looks like a good alternative to nfs

Thanks




From: "Vlad Gorbunov" <vadikgo@xxxxxxxxx>
To: "Andrei Mikhailovsky" <andrei at arhont.com>
Cc: ceph-users at lists.ceph.com
Sent: Wednesday, 7 May, 2014 12:02:09 PM
Subject: Re: NFS over CEPH - best practice

For XenServer or VMware is better to use iscsi client to tgtd with ceph support. You can install tgtd on osd or monitor server and use multipath for failover.


On Wed, May 7, 2014 at 9:47 PM, Andrei Mikhailovsky <andrei at arhont.com> wrote:


Hello guys,

I would like to offer NFS service to the XenServer and VMWare hypervisors for storing vm images. I am currently running ceph rbd with kvm, which is working reasonably well.

What would be the best way of running NFS services over CEPH, so that the XenServer and VMWare's vm disk images are stored in ceph storage over NFS?

Many thanks

Andrei 












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