[Ocfs2-devel] Adding new node to an online OCFS2 cluster

[alex chen <alex.chen@huawei.com>]

Hi C?dric,

Now we don't support change the slot number when the device is online.
you should umount the OCFS2 filesystem if you want to update the slot number.

Thanks,
Alex

On 2017/11/9 21:04, BASSAGET C?dric wrote:
> Hi Joseph.
> my shared disk is formatted with 2 slots :
> root at debian2:~# debugfs.ocfs2 /dev/sdb -R stats | grep Slots
> Max Node Slots: 2
> 
> I was hoping I can change it without unmounting my partition but it seems not :
> root at debian2:~# tunefs.ocfs2 -N 3 /dev/sdb
> tunefs.ocfs2: Trylock failed while opening device "/dev/sdb"
> 
> C?dric
> 
> 
> 2017-11-09 12:54 GMT+01:00 Joseph Qi <jiangqi903 at gmail.com <mailto:jiangqi903@gmail.com>>:
> 
>     Hi C?dric,
>     I guess it is because your shared disk is formatted with only 2 slots.
>     You can check it using debugfs.ocfs2.
>     If it is, you may update slot count using tunefs.ocfs2 -N <num_of_slot>.
>     Hope it will help you.
> 
>     Thanks,
>     Joseph
> 
>     On 17/11/9 18:56, BASSAGET C?dric wrote:
>     > Hello,
>     > As I did not get help on users mailing list, I allow myself to post my
>     > question here. Sorry if it's not the right place, but I can't find any
>     > documentation.
>     >
>     > I'm currently running an OCFS2 cluster on two hosts.
>     > My ocfs2 partition is an iscsi disk mounted on both hosts debian1 and
>     > debian2
>     >
>     > I need to add a third host (debian3) to this cluster.
>     > I've set up  iscsi (& multipath), but now I'm looking for the correct way
>     > to add the ocfs2 partition to my existing cluster.
>     >
>     > root at debian1:~# cat /etc/ocfs2/cluster.conf
>     > node:
>     >         ip_port = 7777
>     >         ip_address = 192.168.0.11
>     >         number = 0
>     >         name = debian1
>     >         cluster = ocfs2
>     > node:
>     >         ip_port = 7777
>     >         ip_address = 192.168.0.12
>     >         number = 1
>     >         name = debian2
>     >         cluster = ocfs2
>     > cluster:
>     >         node_count = 2
>     >         name = ocfs2
>     >
>     > Same config on debian2.
>     >
>     > I try to add the new node to the cluster, running this command on nodes
>     > debian1 et debian2 :
>     >
>     > root at debian1:~# o2cb_ctl -C -i -n debian3 -t node -a number=2 -a
>     > ip_address=192.168.0.13 -a ip_port=7777 -a cluster=ocfs2
>     >
>     > my new node is added to the config file, and node_count is incremented to 3.
>     >
>     > then I do a "systemctl reload ocfs2" on debian1 and debian2.
>     > I copy the cluster.conf file on debian3 and restart ocfs2 on it.
>     >
>     > and in dmesg, I get :
>     > [  145.582469] o2net: Connected to node debian2 (num 1) at 192.168.0.12:7777 <https://urldefense.proofpoint.com/v2/url?u=http-3A__192.168.0.12-3A7777&d=DwMFaQ&c=RoP1YumCXCgaWHvlZYR8PZh8Bv7qIrMUB65eapI_JnE&r=C7gAd4uDxlAvTdc0vmU6X8CMk6L2iDY8-HD0qT6Fo7Y&m=2EscYgpUzamy6kXer3E9ni-s4QSmWNqUMBPuy0bdPUg&s=6GK0ClcSvN8cn-ZeNxir0kxLlGwKc83XFX77IRPtZcI&e=>
>     > [  145.582978] o2net: Connected to node debian1 (num 0) at 192.168.0.11:7777 <https://urldefense.proofpoint.com/v2/url?u=http-3A__192.168.0.11-3A7777&d=DwMFaQ&c=RoP1YumCXCgaWHvlZYR8PZh8Bv7qIrMUB65eapI_JnE&r=C7gAd4uDxlAvTdc0vmU6X8CMk6L2iDY8-HD0qT6Fo7Y&m=2EscYgpUzamy6kXer3E9ni-s4QSmWNqUMBPuy0bdPUg&s=hM2TN0X94tyug5Xe3syHQDl6GCTBvQaetKLtWwdZq04&e=>
>     > [  149.631921] o2dlm: Joining domain D2A1F74976E04C55B625CDC8DAC1D5E5
>     > [  149.631922] (
>     > [  149.631923] 0
>     > [  149.631924] 1
>     > [  149.631924] 2
>     > [  149.631925] ) 3 nodes
>     > [  149.634255] (mount.ocfs2,1627,0):ocfs2_find_slot:490 *ERROR: no free
>     > slots available!*
>     > [  149.634784] (mount.ocfs2,1627,0):ocfs2_mount_volume:1859 ERROR: status =
>     > -22
>     > [  153.738044] o2dlm: Leaving domain D2A1F74976E04C55B625CDC8DAC1D5E5
>     > [  153.738153] ocfs2: Unmounting device (254,0) on (node 2)
>     > [  153.738174] (mount.ocfs2,1627,0):ocfs2_fill_super:1218 ERROR: status =
>     > -22
>     > [  155.657295] o2net: No longer connected to node debian1 (num 0) at
>     > 192.168.0.11:7777 <https://urldefense.proofpoint.com/v2/url?u=http-3A__192.168.0.11-3A7777&d=DwMFaQ&c=RoP1YumCXCgaWHvlZYR8PZh8Bv7qIrMUB65eapI_JnE&r=C7gAd4uDxlAvTdc0vmU6X8CMk6L2iDY8-HD0qT6Fo7Y&m=2EscYgpUzamy6kXer3E9ni-s4QSmWNqUMBPuy0bdPUg&s=hM2TN0X94tyug5Xe3syHQDl6GCTBvQaetKLtWwdZq04&e=>
>     > [  155.657387] o2net: No longer connected to node debian2 (num 1) at
>     > 192.168.0.12:7777 <https://urldefense.proofpoint.com/v2/url?u=http-3A__192.168.0.12-3A7777&d=DwMFaQ&c=RoP1YumCXCgaWHvlZYR8PZh8Bv7qIrMUB65eapI_JnE&r=C7gAd4uDxlAvTdc0vmU6X8CMk6L2iDY8-HD0qT6Fo7Y&m=2EscYgpUzamy6kXer3E9ni-s4QSmWNqUMBPuy0bdPUg&s=6GK0ClcSvN8cn-ZeNxir0kxLlGwKc83XFX77IRPtZcI&e=>
>     >
>     >
>     > Can anyone tell me how I can add a slot, so my new node can work ?
>     >
>     > Thanks for your help.
>     > Regards,
>     > C?dric
>     >
>     >
>     >
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> 
> 
> 
> 
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