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



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!


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