[dm-devel] Failover between two paths to one LU doesn't work onlinux-iscsi

[Michael Lyulko]

Dave Wysochanski wrote:
>> I ran iozone benchmark and manually failed one of two paths. There was 
>> no failover to second path.
>> The iSCSI initiator retried to reconnect to the first path - 
>> unsuccessfully. When I restored the first
>> path - the initiator reconnected to the target via the first path.
>>
>> Thanks!
>>
>> ------------- INFO -------------
>> Versions:
>> device-mapper-1.01.01-1.6
>> multipath-tools-0.4.5-0.11
>>
>> Machine:
>> 2.6.5-7.244-smp; x86_64; SLES9 sp3
>>
>>     
>
> Did you set ConnFailTimeout to a non-zero value?  This sounds like it's
> still at default (reconnect indefinately).  You also need to set the
> Multipath variable, but it sounds like you may have done that already.
>
>
>
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>   
Thanks! Now I set ConnFailTimeout=30 and when one of the paths failed a 
fail-over to
second path occurred (I had Multipath=portal). But after the first path 
is back (iSCSI session
is established and I can read from the device) multipath -l shows:
<snip>
\_ round-robin 0 [enabled]
 \_ 0:0:6:0 sda 8:0  [failed][ready]            //   still "failed" - 
Michael
\_ round-robin 0 [active]
 \_ 0:1:6:0 sdb 8:16 [active][ready]

1. How can I configure the DM to automatically detect that a path is 
active again?
2. I don't have a multipath.conf in /etc. Is 
/usr/share/doc/packages/multipath-tools/
the right place to take it from?
3. What params in multipath.conf are a must in this case of fail-over 
setup regarding question no.1?

Thanks again!