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Nathan Coulson

2016-Apr-11 20:14 UTC

[CentOS-virt] Problems with scsi-target-utils when hosted on dom0 centos 7 xen box

Hello

We were attempting to use scsi-target-utils, hosted on a xen dom0 vm 
using localhost, and running into some problems.  I was not able to 
reproduce this on a centos 7.2 server using the default kernel.


(From dmesg)
Apr  4 11:18:42 funk kernel: [  596.511204]  connection2:0: detected 
conn error (1022)
Apr  4 11:18:42 funk kernel: connection2:0: ping timeout of 5 secs 
expired, recv timeout 5, last rx 4295253788, last ping 4295258790, now 
4295263808
Apr  4 11:18:42 funk kernel: connection2:0: detected conn error (1022)
Apr  4 11:18:42 funk iscsid: Kernel reported iSCSI connection 2:0 error 
(1022 - Invalid or unknown error code) state (3)
Apr  4 11:18:44 funk iscsid: connection2:0 is operational after recovery 
(1 attempts)

Repeated a few times, until eventually


Apr  4 11:19:44 funk kernel: Result: hostbyte=DID_TRANSPORT_DISRUPTED 
driverbyte=DRIVER_OK
Apr  4 11:19:44 funk kernel: sd 7:0:0:1: [sdd] CDB:
Apr  4 11:19:44 funk kernel: Write(10): 2a 00 01 df c7 e8 00 00 18 00
Apr  4 11:19:44 funk kernel: blk_update_request: I/O error, dev sdd, 
sector 31442920
Apr  4 11:19:44 funk kernel: [  658.127596] sd 7:0:0:1: [sdd]
Apr  4 11:19:44 funk kernel: [  658.127688] Result: 
hostbyte=DID_TRANSPORT_DISRUPTED driverbyte=DRIVER_OK
Apr  4 11:19:44 funk kernel: [  658.127761] sd 7:0:0:1: [sdd] CDB:
Apr  4 11:19:44 funk kernel: [  658.127826] Write(10): 2a 00 01 df c7 e8 
00 00 18 00
Apr  4 11:19:44 funk kernel: [  658.127927] blk_update_request: I/O 
error, dev sdd, sector 31442920
Apr  4 11:19:44 funk kernel: [  658.128040] sd 7:0:0:1: [sdd]
Apr  4 11:19:44 funk kernel: sd 7:0:0:1: [sdd]
Apr  4 11:19:44 funk kernel: [  658.128105] Result: 
hostbyte=DID_TRANSPORT_DISRUPTED driverbyte=DRIVER_OK
Apr  4 11:19:44 funk kernel: [  658.128177] sd 7:0:0:1: [sdd] CDB:
Apr  4 11:19:44 funk kernel: [  658.128241] Write(10): 2a 00 00 00 08 00 
00 00 18 00
Apr  4 11:19:44 funk kernel: [  658.128339] blk_update_request: I/O 
error, dev sdd, sector 2048
Apr  4 11:19:44 funk kernel: Result: hostbyte=DID_TRANSPORT_DISRUPTED 
driverbyte=DRIVER_OK
Apr  4 11:19:44 funk kernel: sd 7:0:0:1: [sdd] CDB:
Apr  4 11:19:44 funk kernel: Write(10): 2a 00 00 00 08 00 00 00 18 00
Apr  4 11:19:44 funk kernel: blk_update_request: I/O error, dev sdd, 
sector 2048


(Test Setup)
scsi-target-utils installed via yum, default config
/etc/tgt/conf.d/xenguests.conf
<target iqn.2016-02.com.bravenet:test>
     backing-store //mnt/vmdisk/test # vm image
</target>

systemctl tgtd restart

iscsiadm -m discovery -t sendtargets -p localhost

iscsiadm -m node -T iqn.2016-02.com.bravenet:test -l


add it to lvm (pvcreate, vgcreate), let's call it /dev/vmdisk.vg/test.lv

and then use libvirt to attempt to install an os on 
/dev/vmdisk.vg/test.lv  (using anaconda)




Around the time it tries to create the disk label, is when the conn 
errors start, until eventually it gives up trying to create the disk label.



We tested a similar setup on a centos 7.2 host we use kvm based 
virtualmachine hosting on (default 3.10 kernel), and it worked fine.  It 
may be similar to what was reported on 
https://bugzilla.redhat.com/show_bug.cgi?id=1245990, but I never saw a 
resolution on what they discovered (other then a reference to comment18 
which does not appear to exist).

Testing over the network appears to also work as well (where another 
machine connects to scsi-target-utils on the funk server above.





Longterm Purpose of the above setup, was to get direct access to a 
filesystem image hosted on a gluster setup, using bs-type glfs on 
scsi-target-utils.

-- 
Nathan Coulson
www.bravenet.com
nathan at bravenet.com

George Dunlap

2016-Apr-12 10:26 UTC

head link

[CentOS-virt] Problems with scsi-target-utils when hosted on dom0 centos 7 xen box

On Mon, Apr 11, 2016 at 9:14 PM, Nathan Coulson <nathan at bravenet.com>
wrote:> Hello
>
> We were attempting to use scsi-target-utils, hosted on a xen dom0 vm using
> localhost, and running into some problems.  I was not able to reproduce
this
> on a centos 7.2 server using the default kernel.
Have you tried booting the Virt SIG kernel natively and seeing if you
can reproduce the problem at all?

Thanks,
 -George
>
>
> (From dmesg)
> Apr  4 11:18:42 funk kernel: [  596.511204]  connection2:0: detected conn
> error (1022)
> Apr  4 11:18:42 funk kernel: connection2:0: ping timeout of 5 secs expired,
> recv timeout 5, last rx 4295253788, last ping 4295258790, now 4295263808
> Apr  4 11:18:42 funk kernel: connection2:0: detected conn error (1022)
> Apr  4 11:18:42 funk iscsid: Kernel reported iSCSI connection 2:0 error
> (1022 - Invalid or unknown error code) state (3)
> Apr  4 11:18:44 funk iscsid: connection2:0 is operational after recovery (1
> attempts)
>
> Repeated a few times, until eventually
>
>
> Apr  4 11:19:44 funk kernel: Result: hostbyte=DID_TRANSPORT_DISRUPTED
> driverbyte=DRIVER_OK
> Apr  4 11:19:44 funk kernel: sd 7:0:0:1: [sdd] CDB:
> Apr  4 11:19:44 funk kernel: Write(10): 2a 00 01 df c7 e8 00 00 18 00
> Apr  4 11:19:44 funk kernel: blk_update_request: I/O error, dev sdd, sector
> 31442920
> Apr  4 11:19:44 funk kernel: [  658.127596] sd 7:0:0:1: [sdd]
> Apr  4 11:19:44 funk kernel: [  658.127688] Result:
> hostbyte=DID_TRANSPORT_DISRUPTED driverbyte=DRIVER_OK
> Apr  4 11:19:44 funk kernel: [  658.127761] sd 7:0:0:1: [sdd] CDB:
> Apr  4 11:19:44 funk kernel: [  658.127826] Write(10): 2a 00 01 df c7 e8 00
> 00 18 00
> Apr  4 11:19:44 funk kernel: [  658.127927] blk_update_request: I/O error,
> dev sdd, sector 31442920
> Apr  4 11:19:44 funk kernel: [  658.128040] sd 7:0:0:1: [sdd]
> Apr  4 11:19:44 funk kernel: sd 7:0:0:1: [sdd]
> Apr  4 11:19:44 funk kernel: [  658.128105] Result:
> hostbyte=DID_TRANSPORT_DISRUPTED driverbyte=DRIVER_OK
> Apr  4 11:19:44 funk kernel: [  658.128177] sd 7:0:0:1: [sdd] CDB:
> Apr  4 11:19:44 funk kernel: [  658.128241] Write(10): 2a 00 00 00 08 00 00
> 00 18 00
> Apr  4 11:19:44 funk kernel: [  658.128339] blk_update_request: I/O error,
> dev sdd, sector 2048
> Apr  4 11:19:44 funk kernel: Result: hostbyte=DID_TRANSPORT_DISRUPTED
> driverbyte=DRIVER_OK
> Apr  4 11:19:44 funk kernel: sd 7:0:0:1: [sdd] CDB:
> Apr  4 11:19:44 funk kernel: Write(10): 2a 00 00 00 08 00 00 00 18 00
> Apr  4 11:19:44 funk kernel: blk_update_request: I/O error, dev sdd, sector
> 2048
>
>
> (Test Setup)
> scsi-target-utils installed via yum, default config
> /etc/tgt/conf.d/xenguests.conf
> <target iqn.2016-02.com.bravenet:test>
>     backing-store //mnt/vmdisk/test # vm image
> </target>
>
> systemctl tgtd restart
>
> iscsiadm -m discovery -t sendtargets -p localhost
>
> iscsiadm -m node -T iqn.2016-02.com.bravenet:test -l
>
>
> add it to lvm (pvcreate, vgcreate), let's call it
/dev/vmdisk.vg/test.lv
>
> and then use libvirt to attempt to install an os on /dev/vmdisk.vg/test.lv
> (using anaconda)
>
>
>
>
> Around the time it tries to create the disk label, is when the conn errors
> start, until eventually it gives up trying to create the disk label.
>
>
>
> We tested a similar setup on a centos 7.2 host we use kvm based
> virtualmachine hosting on (default 3.10 kernel), and it worked fine.  It
may
> be similar to what was reported on
> https://bugzilla.redhat.com/show_bug.cgi?id=1245990, but I never saw a
> resolution on what they discovered (other then a reference to comment18
> which does not appear to exist).
>
> Testing over the network appears to also work as well (where another
machine
> connects to scsi-target-utils on the funk server above.
>
>
>
>
>
> Longterm Purpose of the above setup, was to get direct access to a
> filesystem image hosted on a gluster setup, using bs-type glfs on
> scsi-target-utils.
>
> --
> Nathan Coulson
> www.bravenet.com
> nathan at bravenet.com
> _______________________________________________
> CentOS-virt mailing list
> CentOS-virt at centos.org
> https://lists.centos.org/mailman/listinfo/centos-virt

Nathan Coulson

2016-Apr-12 16:43 UTC

head link

[CentOS-virt] Problems with scsi-target-utils when hosted on dom0 centos 7 xen box

By natively, I take it using
kernel /vmlinuz (vs kernel /xen)

Not yet, but working on setting up such an environment.

(At this time, I was using virt-install to reproduce the problem, and 
the original server we are testing on did not support kvm but the 2nd 
server does).

On 2016-04-12 03:26 AM, George Dunlap wrote:> On Mon, Apr 11, 2016 at 9:14 PM, Nathan Coulson <nathan at
bravenet.com> wrote:
>> Hello
>>
>> We were attempting to use scsi-target-utils, hosted on a xen dom0 vm
using
>> localhost, and running into some problems.  I was not able to reproduce
this
>> on a centos 7.2 server using the default kernel.
> Have you tried booting the Virt SIG kernel natively and seeing if you
> can reproduce the problem at all?
>
> Thanks,
>   -George
>
>>
>> (From dmesg)
>> Apr  4 11:18:42 funk kernel: [  596.511204]  connection2:0: detected
conn
>> error (1022)
>> Apr  4 11:18:42 funk kernel: connection2:0: ping timeout of 5 secs
expired,
>> recv timeout 5, last rx 4295253788, last ping 4295258790, now
4295263808
>> Apr  4 11:18:42 funk kernel: connection2:0: detected conn error (1022)
>> Apr  4 11:18:42 funk iscsid: Kernel reported iSCSI connection 2:0 error
>> (1022 - Invalid or unknown error code) state (3)
>> Apr  4 11:18:44 funk iscsid: connection2:0 is operational after
recovery (1
>> attempts)
>>
>> Repeated a few times, until eventually
>>
>>
>> Apr  4 11:19:44 funk kernel: Result: hostbyte=DID_TRANSPORT_DISRUPTED
>> driverbyte=DRIVER_OK
>> Apr  4 11:19:44 funk kernel: sd 7:0:0:1: [sdd] CDB:
>> Apr  4 11:19:44 funk kernel: Write(10): 2a 00 01 df c7 e8 00 00 18 00
>> Apr  4 11:19:44 funk kernel: blk_update_request: I/O error, dev sdd,
sector
>> 31442920
>> Apr  4 11:19:44 funk kernel: [  658.127596] sd 7:0:0:1: [sdd]
>> Apr  4 11:19:44 funk kernel: [  658.127688] Result:
>> hostbyte=DID_TRANSPORT_DISRUPTED driverbyte=DRIVER_OK
>> Apr  4 11:19:44 funk kernel: [  658.127761] sd 7:0:0:1: [sdd] CDB:
>> Apr  4 11:19:44 funk kernel: [  658.127826] Write(10): 2a 00 01 df c7
e8 00
>> 00 18 00
>> Apr  4 11:19:44 funk kernel: [  658.127927] blk_update_request: I/O
error,
>> dev sdd, sector 31442920
>> Apr  4 11:19:44 funk kernel: [  658.128040] sd 7:0:0:1: [sdd]
>> Apr  4 11:19:44 funk kernel: sd 7:0:0:1: [sdd]
>> Apr  4 11:19:44 funk kernel: [  658.128105] Result:
>> hostbyte=DID_TRANSPORT_DISRUPTED driverbyte=DRIVER_OK
>> Apr  4 11:19:44 funk kernel: [  658.128177] sd 7:0:0:1: [sdd] CDB:
>> Apr  4 11:19:44 funk kernel: [  658.128241] Write(10): 2a 00 00 00 08
00 00
>> 00 18 00
>> Apr  4 11:19:44 funk kernel: [  658.128339] blk_update_request: I/O
error,
>> dev sdd, sector 2048
>> Apr  4 11:19:44 funk kernel: Result: hostbyte=DID_TRANSPORT_DISRUPTED
>> driverbyte=DRIVER_OK
>> Apr  4 11:19:44 funk kernel: sd 7:0:0:1: [sdd] CDB:
>> Apr  4 11:19:44 funk kernel: Write(10): 2a 00 00 00 08 00 00 00 18 00
>> Apr  4 11:19:44 funk kernel: blk_update_request: I/O error, dev sdd,
sector
>> 2048
>>
>>
>> (Test Setup)
>> scsi-target-utils installed via yum, default config
>> /etc/tgt/conf.d/xenguests.conf
>> <target iqn.2016-02.com.bravenet:test>
>>      backing-store //mnt/vmdisk/test # vm image
>> </target>
>>
>> systemctl tgtd restart
>>
>> iscsiadm -m discovery -t sendtargets -p localhost
>>
>> iscsiadm -m node -T iqn.2016-02.com.bravenet:test -l
>>
>>
>> add it to lvm (pvcreate, vgcreate), let's call it
/dev/vmdisk.vg/test.lv
>>
>> and then use libvirt to attempt to install an os on
/dev/vmdisk.vg/test.lv
>> (using anaconda)
>>
>>
>>
>>
>> Around the time it tries to create the disk label, is when the conn
errors
>> start, until eventually it gives up trying to create the disk label.
>>
>>
>>
>> We tested a similar setup on a centos 7.2 host we use kvm based
>> virtualmachine hosting on (default 3.10 kernel), and it worked fine. 
It may
>> be similar to what was reported on
>> https://bugzilla.redhat.com/show_bug.cgi?id=1245990, but I never saw a
>> resolution on what they discovered (other then a reference to comment18
>> which does not appear to exist).
>>
>> Testing over the network appears to also work as well (where another
machine
>> connects to scsi-target-utils on the funk server above.
>>
>>
>>
>>
>>
>> Longterm Purpose of the above setup, was to get direct access to a
>> filesystem image hosted on a gluster setup, using bs-type glfs on
>> scsi-target-utils.
>>
>> --
>> Nathan Coulson
>> www.bravenet.com
>> nathan at bravenet.com
>> _______________________________________________
>> CentOS-virt mailing list
>> CentOS-virt at centos.org
>> https://lists.centos.org/mailman/listinfo/centos-virt
> _______________________________________________
> CentOS-virt mailing list
> CentOS-virt at centos.org
> https://lists.centos.org/mailman/listinfo/centos-virt
>

-- 
Nathan Coulson
System Administrator for Bravenet
www.bravenet.com
nathan at bravenet.com

Hans Loots

2016-Apr-14 14:10 UTC

head link

[CentOS-virt] Problems with scsi-target-utils when hosted on dom0 centos 7 xen box

Hello Nathan, dear all,
> We were attempting to use scsi-target-utils, hosted on a xen dom0 vm
using localhost,> and running into some problems.  I was not able to reproduce this on a
centos 7.2> server using the default kernel.
I am seeing comparable things on our centos6 xen servers running 3.18
kernels. We have about 20 of those machines running and have started
upgrading them from 3.10.68 to 3.18 a couple of weeks ago. But currently,
at 3/4 of finishing, I'm having second thoughts and am thinking about
rolling back because of reliability issues.

Stuff I've tried before is taking care that all machine runs latest
BIOS'es
and ethernet firmware. The servers in question are Dell PowerEdges from
different generations, talking to an Equallogic diskarray over 1Gbit
copper. Dells toolset is installed, OMSA as well as hitkit.

The errors I'm seeing are looking like this:

Apr 13 23:03:43 xen15-2 iscsid: Kernel reported iSCSI connection 25:0 error
(1020 - ISCSI_ERR_TCP_CONN_CLOSE: TCP connection closed) state (1)
Apr 13 23:03:43 xen15-2 iscsid: Connection25:0 to [target: iqn.xxxxx,
portal: a.b.c.d,3260] through [iface: eql.em2] is operational now
Apr 13 23:03:48 xen15-2 iscsid: Connection9:0 to [target: iqn.xxxxx,
portal: a.b.c.d,3260] through [iface: eql.em2] is shutdown.

While the the only noticeable difference in dmesg output is stuff like this:
(on 3.18)
pci 0000:02:00.0: can't claim BAR 6 [mem 0xfff00000-0xffffffff pref]: no
compatible bridge window
pci 0000:01:00.0: can't claim BAR 6 [mem 0xfff80000-0xffffffff pref]: no
compatible bridge window
pci 0000:01:00.0: BAR 6: assigned [mem 0x91e80000-0x91efffff pref]
pci 0000:01:00.1: BAR 6: no space for [mem size 0x00080000 pref]
pci 0000:01:00.1: BAR 6: failed to assign [mem size 0x00080000 pref]
pci 0000:01:00.2: BAR 6: no space for [mem size 0x00080000 pref]
pci 0000:01:00.2: BAR 6: failed to assign [mem size 0x00080000 pref]
pci 0000:01:00.3: BAR 6: no space for [mem size 0x00080000 pref]
pci 0000:01:00.3: BAR 6: failed to assign [mem size 0x00080000 pref]
(and on 3.10)
pci 0000:00:03.0: BAR 15: assigned [mem 0xd5200000-0xd53fffff pref]
pci 0000:01:00.1: BAR 6: assigned [mem 0xd5000000-0xd507ffff pref]
pci 0000:01:00.2: BAR 6: assigned [mem 0xd5080000-0xd50fffff pref]
pci 0000:01:00.3: BAR 6: assigned [mem 0xd5100000-0xd517ffff pref]
pci 0000:00:01.0: PCI bridge to [bus 01]
pci 0000:00:01.0:   bridge window [mem 0xd8000000-0xd8ffffff]
pci 0000:00:01.0:   bridge window [mem 0xd5000000-0xd51fffff pref]

But to be honest, my knowledge as to the possible cause of this is lacking.
Is this just a small ACPI related glitch or is it the sign ethernet cards
are misbehaving somehow?

Are more people seeing errors in this area?

Thx and regards,
-- Hans (just trying to make sense of it all)


2016-04-11 22:14 GMT+02:00 Nathan Coulson <nathan at bravenet.com>:
> Hello
>
> We were attempting to use scsi-target-utils, hosted on a xen dom0 vm using
> localhost, and running into some problems.  I was not able to reproduce
> this on a centos 7.2 server using the default kernel.
>
>
> (From dmesg)
> Apr  4 11:18:42 funk kernel: [  596.511204]  connection2:0: detected conn
> error (1022)
> Apr  4 11:18:42 funk kernel: connection2:0: ping timeout of 5 secs
> expired, recv timeout 5, last rx 4295253788, last ping 4295258790, now
> 4295263808
> Apr  4 11:18:42 funk kernel: connection2:0: detected conn error (1022)
> Apr  4 11:18:42 funk iscsid: Kernel reported iSCSI connection 2:0 error
> (1022 - Invalid or unknown error code) state (3)
> Apr  4 11:18:44 funk iscsid: connection2:0 is operational after recovery
> (1 attempts)
>
> Repeated a few times, until eventually
>
>
> Apr  4 11:19:44 funk kernel: Result: hostbyte=DID_TRANSPORT_DISRUPTED
> driverbyte=DRIVER_OK
> Apr  4 11:19:44 funk kernel: sd 7:0:0:1: [sdd] CDB:
> Apr  4 11:19:44 funk kernel: Write(10): 2a 00 01 df c7 e8 00 00 18 00
> Apr  4 11:19:44 funk kernel: blk_update_request: I/O error, dev sdd,
> sector 31442920
> Apr  4 11:19:44 funk kernel: [  658.127596] sd 7:0:0:1: [sdd]
> Apr  4 11:19:44 funk kernel: [  658.127688] Result:
> hostbyte=DID_TRANSPORT_DISRUPTED driverbyte=DRIVER_OK
> Apr  4 11:19:44 funk kernel: [  658.127761] sd 7:0:0:1: [sdd] CDB:
> Apr  4 11:19:44 funk kernel: [  658.127826] Write(10): 2a 00 01 df c7 e8
> 00 00 18 00
> Apr  4 11:19:44 funk kernel: [  658.127927] blk_update_request: I/O error,
> dev sdd, sector 31442920
> Apr  4 11:19:44 funk kernel: [  658.128040] sd 7:0:0:1: [sdd]
> Apr  4 11:19:44 funk kernel: sd 7:0:0:1: [sdd]
> Apr  4 11:19:44 funk kernel: [  658.128105] Result:
> hostbyte=DID_TRANSPORT_DISRUPTED driverbyte=DRIVER_OK
> Apr  4 11:19:44 funk kernel: [  658.128177] sd 7:0:0:1: [sdd] CDB:
> Apr  4 11:19:44 funk kernel: [  658.128241] Write(10): 2a 00 00 00 08 00
> 00 00 18 00
> Apr  4 11:19:44 funk kernel: [  658.128339] blk_update_request: I/O error,
> dev sdd, sector 2048
> Apr  4 11:19:44 funk kernel: Result: hostbyte=DID_TRANSPORT_DISRUPTED
> driverbyte=DRIVER_OK
> Apr  4 11:19:44 funk kernel: sd 7:0:0:1: [sdd] CDB:
> Apr  4 11:19:44 funk kernel: Write(10): 2a 00 00 00 08 00 00 00 18 00
> Apr  4 11:19:44 funk kernel: blk_update_request: I/O error, dev sdd,
> sector 2048
>
>
> (Test Setup)
> scsi-target-utils installed via yum, default config
> /etc/tgt/conf.d/xenguests.conf
> <target iqn.2016-02.com.bravenet:test>
>     backing-store //mnt/vmdisk/test # vm image
> </target>
>
> systemctl tgtd restart
>
> iscsiadm -m discovery -t sendtargets -p localhost
>
> iscsiadm -m node -T iqn.2016-02.com.bravenet:test -l
>
>
> add it to lvm (pvcreate, vgcreate), let's call it
/dev/vmdisk.vg/test.lv
>
> and then use libvirt to attempt to install an os on /dev/vmdisk.vg/test.lv
> (using anaconda)
>
>
>
>
> Around the time it tries to create the disk label, is when the conn errors
> start, until eventually it gives up trying to create the disk label.
>
>
>
> We tested a similar setup on a centos 7.2 host we use kvm based
> virtualmachine hosting on (default 3.10 kernel), and it worked fine.  It
> may be similar to what was reported on
> https://bugzilla.redhat.com/show_bug.cgi?id=1245990, but I never saw a
> resolution on what they discovered (other then a reference to comment18
> which does not appear to exist).
>
> Testing over the network appears to also work as well (where another
> machine connects to scsi-target-utils on the funk server above.
>
>
>
>
>
> Longterm Purpose of the above setup, was to get direct access to a
> filesystem image hosted on a gluster setup, using bs-type glfs on
> scsi-target-utils.
>
> --
> Nathan Coulson
> www.bravenet.com
> nathan at bravenet.com
> _______________________________________________
> CentOS-virt mailing list
> CentOS-virt at centos.org
> https://lists.centos.org/mailman/listinfo/centos-virt
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Nathan Coulson

2016-Apr-15 20:27 UTC

head link

[CentOS-virt] Problems with scsi-target-utils when hosted on dom0 centos 7 xen box

On 2016-04-14 07:10 AM, Hans Loots wrote:> Hello Nathan, dear all,
>
> > We were attempting to use scsi-target-utils, hosted on a xen dom0 vm 
> using localhost,
> > and running into some problems.  I was not able to reproduce this on 
> a centos 7.2
> > server using the default kernel.
>
> I am seeing comparable things on our centos6 xen servers running 3.18 
> kernels. We have about 20 of those machines running and have started 
> upgrading them from 3.10.68 to 3.18 a couple of weeks ago. But 
> currently, at 3/4 of finishing, I'm having second thoughts and am 
> thinking about rolling back because of reliability issues.
>
> Stuff I've tried before is taking care that all machine runs latest 
> BIOS'es and ethernet firmware. The servers in question are Dell 
> PowerEdges from different generations, talking to an Equallogic 
> diskarray over 1Gbit copper. Dells toolset is installed, OMSA as well 
> as hitkit.
>
> The errors I'm seeing are looking like this:
>
> Apr 13 23:03:43 xen15-2 iscsid: Kernel reported iSCSI connection 25:0 
> error (1020 - ISCSI_ERR_TCP_CONN_CLOSE: TCP connection closed) state (1)
> Apr 13 23:03:43 xen15-2 iscsid: Connection25:0 to [target: iqn.xxxxx, 
> portal: a.b.c.d,3260] through [iface: eql.em2] is operational now
> Apr 13 23:03:48 xen15-2 iscsid: Connection9:0 to [target: iqn.xxxxx, 
> portal: a.b.c.d,3260] through [iface: eql.em2] is shutdown.
>
I did not have interface shutdowns in my tests (well, Network Manager 
was doing something there but I disabled it for my tests). The hardware 
is an old Tyan S2882D motherboard, 8GB Ram, and 2x Opteron 275 
processors (Dual Core).


> While the the only noticeable difference in dmesg output is stuff like 
> this:
> (on 3.18)
> pci 0000:02:00.0: can't claim BAR 6 [mem 0xfff00000-0xffffffff pref]: 
> no compatible bridge window
> pci 0000:01:00.0: can't claim BAR 6 [mem 0xfff80000-0xffffffff pref]: 
> no compatible bridge window
> pci 0000:01:00.0: BAR 6: assigned [mem 0x91e80000-0x91efffff pref]
> pci 0000:01:00.1: BAR 6: no space for [mem size 0x00080000 pref]
> pci 0000:01:00.1: BAR 6: failed to assign [mem size 0x00080000 pref]
> pci 0000:01:00.2: BAR 6: no space for [mem size 0x00080000 pref]
> pci 0000:01:00.2: BAR 6: failed to assign [mem size 0x00080000 pref]
> pci 0000:01:00.3: BAR 6: no space for [mem size 0x00080000 pref]
> pci 0000:01:00.3: BAR 6: failed to assign [mem size 0x00080000 pref]
> (and on 3.10)
> pci 0000:00:03.0: BAR 15: assigned [mem 0xd5200000-0xd53fffff pref]
> pci 0000:01:00.1: BAR 6: assigned [mem 0xd5000000-0xd507ffff pref]
> pci 0000:01:00.2: BAR 6: assigned [mem 0xd5080000-0xd50fffff pref]
> pci 0000:01:00.3: BAR 6: assigned [mem 0xd5100000-0xd517ffff pref]
> pci 0000:00:01.0: PCI bridge to [bus 01]
> pci 0000:00:01.0:   bridge window [mem 0xd8000000-0xd8ffffff]
> pci 0000:00:01.0:   bridge window [mem 0xd5000000-0xd51fffff pref]
>
> But to be honest, my knowledge as to the possible cause of this is 
> lacking. Is this just a small ACPI related glitch or is it the sign 
> ethernet cards are misbehaving somehow?
>
> Are more people seeing errors in this area?
>
> Thx and regards,
> -- Hans (just trying to make sense of it all)
>
>
> 2016-04-11 22:14 GMT+02:00 Nathan Coulson <nathan at bravenet.com 
> <mailto:nathan at bravenet.com>>:
>
>     Hello
>
>     We were attempting to use scsi-target-utils, hosted on a xen dom0
>     vm using localhost, and running into some problems.  I was not
>     able to reproduce this on a centos 7.2 server using the default
>     kernel.
>
>
>     (From dmesg)
>     Apr  4 11:18:42 funk kernel: [  596.511204]  connection2:0:
>     detected conn error (1022)
>     Apr  4 11:18:42 funk kernel: connection2:0: ping timeout of 5 secs
>     expired, recv timeout 5, last rx 4295253788, last ping 4295258790,
>     now 4295263808
>     Apr  4 11:18:42 funk kernel: connection2:0: detected conn error (1022)
>     Apr  4 11:18:42 funk iscsid: Kernel reported iSCSI connection 2:0
>     error (1022 - Invalid or unknown error code) state (3)
>     Apr  4 11:18:44 funk iscsid: connection2:0 is operational after
>     recovery (1 attempts)
>
>     Repeated a few times, until eventually
>
>
>     Apr  4 11:19:44 funk kernel: Result:
>     hostbyte=DID_TRANSPORT_DISRUPTED driverbyte=DRIVER_OK
>     Apr  4 11:19:44 funk kernel: sd 7:0:0:1: [sdd] CDB:
>     Apr  4 11:19:44 funk kernel: Write(10): 2a 00 01 df c7 e8 00 00 18 00
>     Apr  4 11:19:44 funk kernel: blk_update_request: I/O error, dev
>     sdd, sector 31442920
>     Apr  4 11:19:44 funk kernel: [  658.127596] sd 7:0:0:1: [sdd]
>     Apr  4 11:19:44 funk kernel: [  658.127688] Result:
>     hostbyte=DID_TRANSPORT_DISRUPTED driverbyte=DRIVER_OK
>     Apr  4 11:19:44 funk kernel: [  658.127761] sd 7:0:0:1: [sdd] CDB:
>     Apr  4 11:19:44 funk kernel: [  658.127826] Write(10): 2a 00 01 df
>     c7 e8 00 00 18 00
>     Apr  4 11:19:44 funk kernel: [  658.127927] blk_update_request:
>     I/O error, dev sdd, sector 31442920
>     Apr  4 11:19:44 funk kernel: [  658.128040] sd 7:0:0:1: [sdd]
>     Apr  4 11:19:44 funk kernel: sd 7:0:0:1: [sdd]
>     Apr  4 11:19:44 funk kernel: [  658.128105] Result:
>     hostbyte=DID_TRANSPORT_DISRUPTED driverbyte=DRIVER_OK
>     Apr  4 11:19:44 funk kernel: [  658.128177] sd 7:0:0:1: [sdd] CDB:
>     Apr  4 11:19:44 funk kernel: [  658.128241] Write(10): 2a 00 00 00
>     08 00 00 00 18 00
>     Apr  4 11:19:44 funk kernel: [  658.128339] blk_update_request:
>     I/O error, dev sdd, sector 2048
>     Apr  4 11:19:44 funk kernel: Result:
>     hostbyte=DID_TRANSPORT_DISRUPTED driverbyte=DRIVER_OK
>     Apr  4 11:19:44 funk kernel: sd 7:0:0:1: [sdd] CDB:
>     Apr  4 11:19:44 funk kernel: Write(10): 2a 00 00 00 08 00 00 00 18 00
>     Apr  4 11:19:44 funk kernel: blk_update_request: I/O error, dev
>     sdd, sector 2048
>
>
>     (Test Setup)
>     scsi-target-utils installed via yum, default config
>     /etc/tgt/conf.d/xenguests.conf
>     <target iqn.2016-02.com.bravenet:test>
>         backing-store //mnt/vmdisk/test # vm image
>     </target>
>
>     systemctl tgtd restart
>
>     iscsiadm -m discovery -t sendtargets -p localhost
>
>     iscsiadm -m node -T iqn.2016-02.com.bravenet:test -l
>
>
>     add it to lvm (pvcreate, vgcreate), let's call it
>     /dev/vmdisk.vg/test.lv <http://vmdisk.vg/test.lv>
>
>     and then use libvirt to attempt to install an os on
>     /dev/vmdisk.vg/test.lv <http://vmdisk.vg/test.lv> (using
anaconda)
>
>
>
>
>     Around the time it tries to create the disk label, is when the
>     conn errors start, until eventually it gives up trying to create
>     the disk label.
>
>
>
>     We tested a similar setup on a centos 7.2 host we use kvm based
>     virtualmachine hosting on (default 3.10 kernel), and it worked
>     fine.  It may be similar to what was reported on
>     https://bugzilla.redhat.com/show_bug.cgi?id=1245990, but I never
>     saw a resolution on what they discovered (other then a reference
>     to comment18 which does not appear to exist).
>
>     Testing over the network appears to also work as well (where
>     another machine connects to scsi-target-utils on the funk server
>     above.
>
>
>
>
>
>     Longterm Purpose of the above setup, was to get direct access to a
>     filesystem image hosted on a gluster setup, using bs-type glfs on
>     scsi-target-utils.
>
>     -- 
>     Nathan Coulson
>     www.bravenet.com <http://www.bravenet.com>
>     nathan at bravenet.com <mailto:nathan at bravenet.com>
>     _______________________________________________
>     CentOS-virt mailing list
>     CentOS-virt at centos.org <mailto:CentOS-virt at centos.org>
>     https://lists.centos.org/mailman/listinfo/centos-virt
>
>
>
>
> _______________________________________________
> CentOS-virt mailing list
> CentOS-virt at centos.org
> https://lists.centos.org/mailman/listinfo/centos-virt

-- 
Nathan Coulson
System Administrator for Bravenet
www.bravenet.com
nathan at bravenet.com

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