Re: [Xen-users] iSCSI initiator problems accessing Infortrend storage

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Thu, Aug 27, 2009 at 10:21:46AM -0700, Werner Kuballa wrote:
> 
> I am trying to use two Infortrend iSCSI systems (A16E-G2130-4, each with 
> 16x750GB in Raid 6) for our Oracle VM environment (three big Dell R900 
> servers).  When I copy files on the Infortrend I receive SCSI errors, 
> resulting in loss of connection.  I read some postings to this user group 
> indicating that others are successfully using Infortrend storage systems.  
> However, I have tried pretty much everything I can think of, but can not get 
> the Infortrend working reliably with Dom0.  This is what I have tried: 
> 
> - simple iSCSI network connection, just one server connected with only one 
> 1Gb Ethernet NIC to the Infortrend (exclusively no other connections on the 
> Infortrend) 
> 
> - when installing Oracle Enterprise Linux 5.3 natively on the R900, the 
> Infortrend works fine - in all  
> different network connections (single connection, bonded NICs, etc.) 
> 

What is your dom0 OS? Oracle Enterprise Linux 5.3 and the Xen included
in it? 

Or something else? 

> - accessing an EMC AX4 iSCSI system works without any problems 
> 

That's weird.

> No matter what I tried, when utilizing the Infortrend in Dom0 I always get 
> errors as shown below.  And it gets worse when I am using "ocfs2" (what I 
> eventually have to use) - ocfs2 fences off the system when these errors occur 
> and reboots the server. 
> 
> Infortrend Support has no solution for this problem, they maintain that XEN 
> is not a supported platform. 
> 
> Any suggestions would be appreciated. 
> 

Does this happen when only dom0 is running, ie. no domUs? 

If it happens when you have load on the server, try giving dom0 more
weight (and dedicating a cpu core for it) so that it can always get the
needed cpu time for iSCSI processing.

-- Pasi

> Regards, 
> Werner 
> 
> 
> 
> 
> Aug 27 05:16:24 ovm3 multipathd: IFT110: load table [0 8787689472 multipath 1 
> queue_if_no_path 0 1 1 round-robin 0 1 1 8:48 100] 
>   
> Aug 27 05:16:24 ovm3 multipathd: IFT110: event checker started  
> Aug 27 05:16:24 ovm3 multipathd: dm-0: add map (uevent)  
> Aug 27 05:16:24 ovm3 multipathd: dm-0: devmap already registered  
> Aug 27 05:16:24 ovm3 multipathd: dm-1: add map (uevent)  
> Aug 27 05:16:24 ovm3 multipathd: dm-1: devmap already registered  
> Aug 27 05:16:25 ovm3 iscsid: received iferror -38 
> Aug 27 05:16:25 ovm3 last message repeated 2 times 
> Aug 27 05:16:25 ovm3 iscsid: connection1:0 is operational now 
> Aug 27 05:18:08 ovm3 kernel: kjournald starting.  Commit interval 5 seconds 
> Aug 27 05:18:08 ovm3 kernel: EXT3 FS on dm-1, internal journal 
> Aug 27 05:18:08 ovm3 kernel: EXT3-fs: mounted filesystem with ordered data 
> mode. 
> Aug 27 05:19:16 ovm3 kernel: ping timeout of 5 secs expired, last rx 13940, 
> last ping 15190, now 16440 
> Aug 27 05:19:16 ovm3 kernel:  connection1:0: iscsi: detected conn error 
> (1011) 
> Aug 27 05:19:17 ovm3 kernel: sd 4:0:0:1: SCSI error: return code = 0x00020000 
> Aug 27 05:19:17 ovm3 kernel: end_request: I/O error, dev sdd, sector 49529536 
> Aug 27 05:19:17 ovm3 kernel: device-mapper: multipath: Failing path 8:48. 
> Aug 27 05:19:17 ovm3 kernel: sd 4:0:0:1: SCSI error: return code = 0x00020000 
> Aug 27 05:19:17 ovm3 kernel: end_request: I/O error, dev sdd, sector 
> 1569783144 
> Aug 27 05:19:17 ovm3 kernel: sd 4:0:0:1: SCSI error: return code = 0x00020000 
> Aug 27 05:19:17 ovm3 kernel: end_request: I/O error, dev sdd, sector 
> 1569784168 
> Aug 27 05:19:17 ovm3 kernel: sd 4:0:0:1: SCSI error: return code = 0x00020000 
> Aug 27 05:19:17 ovm3 kernel: end_request: I/O error, dev sdd, sector 
> 1569785192 
> Aug 27 05:19:17 ovm3 kernel: sd 4:0:0:1: SCSI error: return code = 0x00020000 
> Aug 27 05:19:17 ovm3 kernel: end_request: I/O error, dev sdd, sector 
> 1569786216 
> Aug 27 05:19:17 ovm3 kernel: sd 4:0:0:1: SCSI error: return code = 0x00020000 
> Aug 27 05:19:17 ovm3 kernel: end_request: I/O error, dev sdd, sector 
> 1569786224 
> Aug 27 05:19:17 ovm3 kernel: sd 4:0:0:1: SCSI error: return code = 0x00020000 
> Aug 27 05:19:17 ovm3 kernel: end_request: I/O error, dev sdd, sector 
> 1569787248 
> Aug 27 05:19:17 ovm3 iscsid: Kernel reported iSCSI connection 1:0 error 
> (1011) state (3) 
> Aug 27 05:19:17 ovm3 kernel: sd 4:0:0:1: SCSI error: return code = 0x00020000 
> Aug 27 05:19:17 ovm3 kernel: end_request: I/O error, dev sdd, sector 
> 1569788272 
> 
> 
> Save Paper.
> Think before you print.

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