iscsi offload on rh el based servers guide?

Clint Dilks clintd at scms.waikato.ac.nz
Mon May 17 16:11:07 CDT 2010


On 15/05/10 03:48, Gianluca Cecchi wrote:
> On Fri, May 14, 2010 at 5:40 PM, Gianluca Cecchi 
> <gianluca.cecchi at gmail.com <mailto:gianluca.cecchi at gmail.com>> wrote:
>
>     [snip]
>
>     But actually I can connect only with one card and only to one
>     node..... ;-(
>     [snip]
>
>
> Just a correction/clarification: the single interface that can connect 
> to the EQL, CAN see all the three volumes (in my latest test I ran a 
> login to a single target volume)
> In fact the command:
> [root at orasvi2 LINUX]# iscsiadm --mode node --portal 10.10.100.30:3260 
> <http://10.10.100.30:3260> -I bnx2i.00:10:18:58:e8:f9 --login
>
> now returns
> Logging in to [iface: bnx2i.00:10:18:58:e8:f9, target: 
> iqn.2001-05.com.equallogic:0-8a0906-97d4b5e06-596000000264bc83-blg9-vol3, 
> portal: 10.10.100.30,3260]
> Logging in to [iface: bnx2i.00:10:18:58:e8:f9, target: 
> iqn.2001-05.com.equallogic:0-8a0906-8904b5e06-b66000000204bc83-blg9-vol1, 
> portal: 10.10.100.30,3260]
> Logging in to [iface: bnx2i.00:10:18:58:e8:f9, target: 
> iqn.2001-05.com.equallogic:0-8a0906-94c4b5e06-df9000000234bc83-blg9-vol2, 
> portal: 10.10.100.30,3260]
> Login to [iface: bnx2i.00:10:18:58:e8:f9, target: 
> iqn.2001-05.com.equallogic:0-8a0906-97d4b5e06-596000000264bc83-blg9-vol3, 
> portal: 10.10.100.30,3260]: successful
> Login to [iface: bnx2i.00:10:18:58:e8:f9, target: 
> iqn.2001-05.com.equallogic:0-8a0906-8904b5e06-b66000000204bc83-blg9-vol1, 
> portal: 10.10.100.30,3260]: successful
> iscsiadm: Could not login to [iface: bnx2i.00:10:18:58:e8:f9, target: 
> iqn.2001-05.com.equallogic:0-8a0906-94c4b5e06-df9000000234bc83-blg9-vol2, 
> portal: 10.10.100.30,3260]:
> iscsiadm: initiator reported error (15 - already exists)
>
> and the other two volumes get connected (while the previous one 
> correctly gets the "already exists" error)
> .
> So that
> # multipath -l
> gives:
>
> vol3 (36090a068e0b5d49783bc640200006059) dm-6 EQLOGIC,100E-00
> [size=200G][features=1 queue_if_no_path][hwhandler=0][rw]
> \_ round-robin 0 [prio=0][active]
>  \_ 2:0:1:0 sdd 8:48  [active][undef]
> vol2 (36090a068e0b5c49483bc3402000090df) dm-3 EQLOGIC,100E-00
> [size=200G][features=1 queue_if_no_path][hwhandler=0][rw]
> \_ round-robin 0 [prio=0][active]
>  \_ 2:0:0:0 sdb 8:16  [active][undef]
> vol1 (36090a068e0b5048983bc0402000060b6) dm-4 EQLOGIC,100E-00
> [size=200G][features=1 queue_if_no_path][hwhandler=0][rw]
> \_ round-robin 0 [prio=0][active]
>  \_ 2:0:2:0 sdc 8:32  [active][undef]
>
>
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My own testing with Dell over a 3 - 4 month period found that if you are 
using Broadcom NICS the technology simply does not work.  Dell suppy a 
driver that is suposed to enable iscsi offloading and seems to.  But 
this driver is only compatible with an older version of open iscsi that 
will only support single path rather than multi-path configurations.


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