[sheepdog] Redundancy policy via iSCSI

[Hitoshi Mitake]

At Tue, 03 Feb 2015 17:02:24 +0900,
Hitoshi Mitake wrote:
> 
> 
> 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?

Additionaly, could you provide options of sheep?

Thanks,
Hitoshi

> 
> Thanks,
> Hitoshi
> 
> > 
> > Thanks!
> > Hu
> > 
> > -- 
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> > sheepdog at lists.wpkg.org
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