[Sheepdog] Configuring simple cluster on CentOS 5.5 x86_64

[Yuriy Kohut]

One more new issue with TGTd.

Initially we have one sheepdog vdi (on which we would like to create iscsi unit) and no tgt targets/units:
[root at centos ~]# tgtadm --op show --mode target
[root at centos ~]# collie vdi list
  name        id    size    used  shared    creation time   vdi id
------------------------------------------------------------------
  test0        1  4.0 GB  4.0 GB  0.0 MB 2010-10-15 17:55   fd34af
[root at centos ~]#  


Creating new target:
[root at centos ~]# tgtadm --op new --mode target --tid 1 -T some.vps:disk0
[root at centos ~]# tgtadm --op show --mode target
Target 1: some.vps:disk0
    System information:
        Driver: iscsi
        State: ready
    I_T nexus information:
    LUN information:
        LUN: 0
            Type: controller
            SCSI ID: IET     00010000
            SCSI SN: beaf10
            Size: 0 MB
            Online: Yes
            Removable media: No
            Readonly: No
            Backing store type: null
            Backing store path: None
            Backing store flags: 
    Account information:
    ACL information:
[root at centos ~]#


Try to create new logicalunit on existing tgt target and sheepdog vdi:
[root at centos ~]# tgtadm --op new --mode logicalunit --tid 1 --lun 1 -b test0 --bstype sheepdog


But the process never ends.
Please advise ...
---
Yura

On Oct 15, 2010, at 4:55 PM, Yuriy Kohut wrote:

> Cool, that works.
> 
> Thanks
> ---
> Yura
> 
> On Oct 15, 2010, at 3:52 PM, MORITA Kazutaka wrote:
> 
>> At Fri, 15 Oct 2010 13:38:16 +0300,
>> Yuriy Kohut wrote:
>>> 
>>> Hi,
>>> 
>>> I'm using the following 'Getting Started' guide to configure simple cluster:
>>> http://www.osrg.net/sheepdog/usage.html
>>> 
>>> I have configured cluster on 1 node/box, so the first questions are:
>>> Can I configure cluster on single node (1 box) under CentOS 5.5 x86_64 ? 
>>> Is it required at least 3 nodes/boxes ... ?
>>> 
>>> I have faced with the following issue on my single-node cluster. I have rebooted the box after my first image creation. The following done for that:
>>> - corosync is up and running
>>> udp        0      0 192.168.128.195:5404        0.0.0.0:*                               3541/corosync       
>>> udp        0      0 192.168.128.195:5405        0.0.0.0:*                               3541/corosync       
>>> udp        0      0 226.94.1.1:5405             0.0.0.0:*                               3541/corosync 
>>> 
>>> - sheep is up and running
>>> tcp        0      0 0.0.0.0:7000                0.0.0.0:*                   LISTEN      3561/sheep
>>> 
>>> - cluster is formatted with 1 copy only
>>> #collie cluster format --copies=1
>>> 
>>> - the image with prelocated data is created
>>> # qemu-img create sheepdog:test0 -o preallocation=data 4G
>>> 
>>> 
>>> So after such siple steps I got:
>>> # collie vdi list
>>> name        id    size    used  shared    creation time   vdi id
>>> ------------------------------------------------------------------
>>> test0        1  4.0 GB  4.0 GB  0.0 MB 2010-10-15 12:42   fd34af
>>> 
>>> 
>>> Then I rebooted the box, and no image(s) are available for me after box came back. The vdi list just show nothing:
>>> # collie vdi list
>>> name        id    size    used  shared    creation time   vdi id
>>> ------------------------------------------------------------------
>>> 
>>> and 'collie vdi list' never ends ...
>>> corosync and sheep are still running.
>>> 
>>> 
>>> Could somebody assist me with that.
>> 
>> Sorry, the following patch will fixes the problem.
>> 
>> =
>> From: MORITA Kazutaka <morita.kazutaka at lab.ntt.co.jp>
>> Subject: [PATCH] sheep: call start_recovery when cluster restarts with one node
>> 
>> Sheepdog recovers objects before starting a storage service, and the
>> routine is called when nodes are joined.  However If sheepdog consists
>> of only one node, no node doesn't send join messages, so
>> start_recovery doesn't called.  This patch fixes the problem.
>> 
>> Signed-off-by: MORITA Kazutaka <morita.kazutaka at lab.ntt.co.jp>
>> ---
>> sheep/group.c |    3 +++
>> 1 files changed, 3 insertions(+), 0 deletions(-)
>> 
>> diff --git a/sheep/group.c b/sheep/group.c
>> index ba8cdfb..86cbdb8 100644
>> --- a/sheep/group.c
>> +++ b/sheep/group.c
>> @@ -1226,6 +1226,9 @@ static void __sd_confchg_done(struct cpg_event *cevent)
>> 
>> 		update_cluster_info(&msg);
>> 
>> +		if (sys->status == SD_STATUS_OK) /* sheepdog starts with one node */
>> +			start_recovery(sys->epoch, NULL, 0);
>> +
>> 		return;
>> 	}
>> 
>> -- 
>> 1.5.6.5
>> 
> 
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