[sheepdog] Redundancy policy via iSCSI

[Hitoshi Mitake]

Hi Hu,
Thanks for your report!

At Tue, 3 Feb 2015 15:52:12 +0800,
hujianyang wrote:
> 
> Hi Hitoshi,
> 
> Sorry for disturb.
> 
> I'm testing redundancy policy of sheepdog via iSCSI. I think
> if I create a 1G v-disk, the total space cost of this device
> should be 3*1G under a 3 copies policy. But after tests, I
> find the cost of this device is only 1G. Seems no additional
> copy is created.
> 
> I don't know what happened. I'd like to should my configurations
> and wish you could take some time to help me. Many thanks!
> 
> 
> linux-rme9:/mnt # dog cluster info
> Cluster status: running, auto-recovery enabled
> 
> Cluster created at Tue Feb  3 23:07:13 2015
> 
> Epoch Time           Version [Host:Port:V-Nodes,,,]
> 2015-02-03 23:07:13      1 [130.1.0.147:7000:128, 130.1.0.148:7000:128, 130.1.0.149:7000:128]
> linux-rme9:/mnt # dog node list
>   Id   Host:Port         V-Nodes       Zone
>    0   130.1.0.147:7000    	128          0
>    1   130.1.0.148:7000    	128          0
>    2   130.1.0.149:7000    	128          0
> linux-rme9:/mnt # dog vdi list
>   Name        Id    Size    Used  Shared    Creation time   VDI id  Copies  Tag   Block Size Shift
>   Hu0          0  1.0 GB  1.0 GB  0.0 MB 2015-02-03 23:12   6e7762      3                22
> linux-rme9:/mnt # dog node info
> Id	Size	Used	Avail	Use%
>  0	261 GB	368 MB	260 GB	  0%
>  1	261 GB	336 MB	261 GB	  0%
>  2	261 GB	320 MB	261 GB	  0%
> Total	783 GB	1.0 GB	782 GB	  0%
> 
> Total virtual image size	1.0 GB
> 
> linux-rme9:/mnt # tgtadm --op show --mode target
> Target 1: iqn.2015.01.org.sheepdog
>     System information:
>         Driver: iscsi
>         State: ready
>     I_T nexus information:
>         I_T nexus: 3
>             Initiator: iqn.1996-04.de.suse:01:23a8f73738e7 alias: Fs-Server
>             Connection: 0
>                 IP Address: 130.1.0.10
>     LUN information:
>         LUN: 0
>             Type: controller
>             SCSI ID: IET     00010000
>             SCSI SN: beaf10
>             Size: 0 MB, Block size: 1
>             Online: Yes
>             Removable media: No
>             Prevent removal: No
>             Readonly: No
>             SWP: No
>             Thin-provisioning: No
>             Backing store type: null
>             Backing store path: None
>             Backing store flags:
>         LUN: 1
>             Type: disk
>             SCSI ID: IET     00010001
>             SCSI SN: beaf11
>             Size: 1074 MB, Block size: 512
>             Online: Yes
>             Removable media: No
>             Prevent removal: No
>             Readonly: No
>             SWP: No
>             Thin-provisioning: No
>             Backing store type: sheepdog
>             Backing store path: tcp:130.1.0.147:7000:Hu0
>             Backing store flags:
>     Account information:
>     ACL information:
>         ALL
> 
> 
> Client:
>  # iscsiadm -m node --targetname iqn.2015.01.org.sheepdog --portal 130.1.0.147:3260 --rescan
> Rescanning session [sid: 4, target: iqn.2015.01.org.sheepdog, portal: 130.1.0.147,3260]
>  # dd if=/dev/random of=/dev/sdg bs=2M
> dd: writing `/dev/sdg': No space left on device
> 0+13611539 records in
> 0+13611538 records out
> 1073741824 bytes (1.1 GB) copied, 956.511 s, 1.1 MB/s

Hmm, seems strange. For diagnosing, I have some questions:

1. Can you see any error messages in log files of sheep?
2. Could you provide lists of obj/ directories of sheep servers?
3. Is this reproducible even you make file system on the iSCSI target
   and put data on the file system?
4. Is this reproducible even you append oflag=sync to the option of dd?

Thanks,
Hitoshi

> 
> Thanks!
> Hu
> 
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