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Re: linux-iscsi and emc powerpath



Hi, 

I have the same implementation and seems that our powerPath does not fail
over properly. Did you by chance come up with a solution to this? I am also
experiencing the following error in the logs: Have you ever seen this before
while you were setting up EMC?

Apr 30 11:59:43 sahara iscsid[5891]: Connection to Discovery Address IP
failed
Apr 30 11:59:43 sahara iscsid[5891]: Connected to Discovery Address IP
Apr 30 11:59:43 sahara iscsid[5893]: Connection to Discovery Address IP
failed
Apr 30 11:59:43 sahara iscsid[5893]: Connected to Discovery Address IP
Apr 30 12:00:14 sahara iscsid[5891]: Connection to Discovery Address IP
failed
Apr 30 12:00:14 sahara iscsid[5891]: Connected to Discovery Address IP
Apr 30 12:00:14 sahara iscsid[5893]: Connection to Discovery Address IP
failed

Cheers, 
Thusjanthan Kubendranathan



Dejan Donovski wrote:
> 
> Hi,
> 
> We are in the implementation phase of an project that includes iscsi
> access to FC storage (EMC CX3-20) via 2 MCData Eclipse 2640 storage
> routers (that make the FC to ISCSI conversion).
> Each Eclipse router is connected to both storage service processors via
> FC switches, and the host discovers 4 targets (two per router for each
> storage processor) for each assigned LUN.
> Various combinations were tested (NICs/HBAs, native multipath/powerpath,
> open-iscsi/linux-iscsi) and only the HBAs/native multipath combination
> gives acceptable results.
> All other combinations work until a path fails, then either the host
> does not failover to other paths or does not restore the failed paths
> after they are available again.
> 
> If anyone has any previous experience with this or similar environment
> please share your ideas on how to make this thing work.
> I am sending the configuration details for the linux-iscsi/EMC powerpath
> setup.
> 
> 
> SLES 9 SP3,2xGB NICs
> 
> uname-a
> Linux linux 2.6.5-7.244-smp #1 SMP Mon Dec 12 18:32:25 UTC 2005 x86_64
> x86_64 x86_64 GNU/Linux
> linux-iscsi-4.0.1-88.13
> EMCpower.LINUX-4.5.1-022 (EMC powerpath)
> 
> after iscid startup i get this
> 
> iscsi-device /dev/sda
> /dev/sda: 0   0   0       10.10.24.3   3260  eui.5006016141e0163a
> iscsi-device /dev/sdb
> /dev/sdb: 0   1   0       10.10.24.3   3260  eui.5006016841e0163a
>  iscsi-device /dev/sdc
> /dev/sdc: 0   2   0       10.10.24.130   3260  eui.5006016041e0163a
> iscsi-device /dev/sdd
> /dev/sdd: 0   3   0       10.10.24.130   3260  eui.5006016941e0163a
> 
> powerpath recognizes that those device files all point to same disk
> 
> powermt display dev=all
> Pseudo name=emcpowera
> CLARiiON ID=CK200063300360 [backup]
> Logical device ID=6006016079E11900E4F44DB01568DB11 [LUN 100GB]
> state=alive; policy=CLAROpt; priority=0; queued-IOs=0
> Owner: default=SP B, current=SP A
> ==============================================================================
> ---------------- Host ---------------   - Stor -   -- I/O Path -  -- Stats
> ---
> ### HW Path                 I/O Paths    Interf.   Mode    State  Q-IOs
> Errors
> ==============================================================================
>    0 SFNet iSCSI driver        sda       SP A1     active  alive      0
> 0
>    0 SFNet iSCSI driver        sdb       SP B0     active  alive      0
> 0
>    0 SFNet iSCSI driver        sdc       SP A0     active  alive      0
> 0
>    0 SFNet iSCSI driver        sdd       SP B1     active  alive      0
> 0
> 
> 
> /etc/iscsi.conf
> #all settings not specified here have default values
> #these initiator settings were recommended by EMC
> DiscoveryAddress=10.10.24.3
> DiscoveryAddress=10.10.24.130
> HeaderDigest=Never
> DataDigest=Never
> PortalFailover=no
> Multipath=yes
> LUNs=0-255
> MaxDiskCommandTimeout=2
> AbortTimeout=3
> ResetTimeout=5
> Continuous=yes
> SendAsyncText=yes
> InitialR2T=yes
> 
> after a combination of LUN tresspassing and enable/disable of the storage
> router iscsi
> ports all of the paths are dead.
> 
> 
> 
> 
> -- 
> 
> Pozdrav,
> Dejan Donovski
> 
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> 

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