Have you made any headway with this issue? I'm having a write issue
that seems to share some similarities with yours.

On Apr 13, 8:14 am, Gonçalo Borges <borges.gonc...@gmail.com> wrote:
> Hi...
>
> > Is /apoio04/b1 a scsi/iscsi disk or is it LVM/DM/RAID on top of a
> > iscsi/scsi disk?
>
> /apoio04/ is a RAID1 of two disks accessible via iscsi (in the
> following tests, I changed the mount point from /apoio04/ to /iscsi04-
> lun0/ but they are exactly the same).
>
>
>
> > Could you set the IO scheduler to noop
> > echo noop > /sys/block/sdX/queue/scheduler and see if that makes a 
> > difference.
>
> I checked the definition and I have
>
> [r...@core06 ~]# cat /sys/block/sdh/queue/scheduler
> noop anticipatory deadline [cfq]
>
> Now I've changed to
>
> [r...@core06 ~]# cat /sys/block/sdh/queue/scheduler
> [noop] anticipatory deadline cfq
>
> and I've run the tests again. This is what I got:
>
> [r...@core06 ~]# dd if=/dev/zero of=/iscsi04-lun0/b1 bs=64k
> count=125000
> 125000+0 records in
> 125000+0 records out
> 8192000000 bytes (8.2 GB) copied, 470.332 seconds, 17.4 MB/s
>
> [r...@core06 ~]# dd if=/dev/zero of=/iscsi04-lun0/b2 bs=128k
> count=62500
> 62500+0 records in
> 62500+0 records out
> 8192000000 bytes (8.2 GB) copied, 470.973 seconds, 17.4 MB/s
>
> Basically, the performance didn't increase :(
>
> > And then also run
> > iscsiadm -m session -P 3
>
> [r...@core06 ~]# iscsiadm -m session -P 3
> iSCSI Transport Class version 2.0-724
> iscsiadm version 2.0-868
> Target: iqn.1992-01.com.lsi:1535.600a0b80003ad11c00000000490ade2d
>         Current Portal: 10.131.2.14:3260,1
>         Persistent Portal: 10.131.2.14:3260,1
>                 **********
>                 Interface:
>                 **********
>                 Iface Name: default
>                 Iface Transport: tcp
>                 Iface Initiatorname: iqn.1994-05.com.redhat:8c56e324f294
>                 Iface IPaddress: 10.131.4.6
>                 Iface HWaddress: default
>                 Iface Netdev: default
>                 SID: 37
>                 iSCSI Connection State: LOGGED IN
>                 iSCSI Session State: Unknown
>                 Internal iscsid Session State: NO CHANGE
>                 ************************
>                 Negotiated iSCSI params:
>                 ************************
>                 HeaderDigest: None
>                 DataDigest: None
>                 MaxRecvDataSegmentLength: 131072
>                 MaxXmitDataSegmentLength: 65536
>                 FirstBurstLength: 8192
>                 MaxBurstLength: 262144
>                 ImmediateData: Yes
>                 InitialR2T: Yes
>                 MaxOutstandingR2T: 1
>                 ************************
>                 Attached SCSI devices:
>                 ************************
>                 Host Number: 38 State: running
>                 scsi38 Channel 00 Id 0 Lun: 0
>                 scsi38 Channel 00 Id 0 Lun: 1
>                 scsi38 Channel 00 Id 0 Lun: 2
>                 scsi38 Channel 00 Id 0 Lun: 3
>                 scsi38 Channel 00 Id 0 Lun: 4
>                 scsi38 Channel 00 Id 0 Lun: 5
>                 scsi38 Channel 00 Id 0 Lun: 31
>         Current Portal: 10.131.2.13:3260,1
>         Persistent Portal: 10.131.2.13:3260,1
>                 **********
>                 Interface:
>                 **********
>                 Iface Name: default
>                 Iface Transport: tcp
>                 Iface Initiatorname: iqn.1994-05.com.redhat:8c56e324f294
>                 Iface IPaddress: 10.131.4.6
>                 Iface HWaddress: default
>                 Iface Netdev: default
>                 SID: 38
>                 iSCSI Connection State: LOGGED IN
>                 iSCSI Session State: Unknown
>                 Internal iscsid Session State: NO CHANGE
>                 ************************
>                 Negotiated iSCSI params:
>                 ************************
>                 HeaderDigest: None
>                 DataDigest: None
>                 MaxRecvDataSegmentLength: 131072
>                 MaxXmitDataSegmentLength: 65536
>                 FirstBurstLength: 8192
>                 MaxBurstLength: 262144
>                 ImmediateData: Yes
>                 InitialR2T: Yes
>                 MaxOutstandingR2T: 1
>                 ************************
>                 Attached SCSI devices:
>                 ************************
>                 Host Number: 39 State: running
>                 scsi39 Channel 00 Id 0 Lun: 0
>                 scsi39 Channel 00 Id 0 Lun: 1
>                 scsi39 Channel 00 Id 0 Lun: 2
>                 scsi39 Channel 00 Id 0 Lun: 3
>                 scsi39 Channel 00 Id 0 Lun: 4
>                 scsi39 Channel 00 Id 0 Lun: 5
>                 scsi39 Channel 00 Id 0 Lun: 31
>         Current Portal: 10.131.2.16:3260,2
>         Persistent Portal: 10.131.2.16:3260,2
>                 **********
>                 Interface:
>                 **********
>                 Iface Name: default
>                 Iface Transport: tcp
>                 Iface Initiatorname: iqn.1994-05.com.redhat:8c56e324f294
>                 Iface IPaddress: 10.131.4.6
>                 Iface HWaddress: default
>                 Iface Netdev: default
>                 SID: 39
>                 iSCSI Connection State: LOGGED IN
>                 iSCSI Session State: Unknown
>                 Internal iscsid Session State: NO CHANGE
>                 ************************
>                 Negotiated iSCSI params:
>                 ************************
>                 HeaderDigest: None
>                 DataDigest: None
>                 MaxRecvDataSegmentLength: 131072
>                 MaxXmitDataSegmentLength: 65536
>                 FirstBurstLength: 8192
>                 MaxBurstLength: 262144
>                 ImmediateData: Yes
>                 InitialR2T: Yes
>                 MaxOutstandingR2T: 1
>                 ************************
>                 Attached SCSI devices:
>                 ************************
>                 Host Number: 40 State: running
>                 scsi40 Channel 00 Id 0 Lun: 0
>                 scsi40 Channel 00 Id 0 Lun: 1
>                 scsi40 Channel 00 Id 0 Lun: 2
>                 scsi40 Channel 00 Id 0 Lun: 3
>                 scsi40 Channel 00 Id 0 Lun: 4
>                 scsi40 Channel 00 Id 0 Lun: 5
>                 scsi40 Channel 00 Id 0 Lun: 31
>         Current Portal: 10.131.2.15:3260,2
>         Persistent Portal: 10.131.2.15:3260,2
>                 **********
>                 Interface:
>                 **********
>                 Iface Name: default
>                 Iface Transport: tcp
>                 Iface Initiatorname: iqn.1994-05.com.redhat:8c56e324f294
>                 Iface IPaddress: 10.131.4.6
>                 Iface HWaddress: default
>                 Iface Netdev: default
>                 SID: 40
>                 iSCSI Connection State: LOGGED IN
>                 iSCSI Session State: Unknown
>                 Internal iscsid Session State: NO CHANGE
>                 ************************
>                 Negotiated iSCSI params:
>                 ************************
>                 HeaderDigest: None
>                 DataDigest: None
>                 MaxRecvDataSegmentLength: 131072
>                 MaxXmitDataSegmentLength: 65536
>                 FirstBurstLength: 8192
>                 MaxBurstLength: 262144
>                 ImmediateData: Yes
>                 InitialR2T: Yes
>                 MaxOutstandingR2T: 1
>                 ************************
>                 Attached SCSI devices:
>                 ************************
>                 Host Number: 41 State: running
>                 scsi41 Channel 00 Id 0 Lun: 0
>                 scsi41 Channel 00 Id 0 Lun: 1
>                 scsi41 Channel 00 Id 0 Lun: 2
>                 scsi41 Channel 00 Id 0 Lun: 3
>                 scsi41 Channel 00 Id 0 Lun: 4
>                 scsi41 Channel 00 Id 0 Lun: 5
>                 scsi41 Channel 00 Id 0 Lun: 31
>
> Cheers and thanks
> Goncalo Borges
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