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Re: AW: [dm-devel] multipathd failback



sorry but I am not sure what you mean.
I am using an iscsi initiator (linux-iscsi rev 4.2)
and this is what the multipathd daemon sees
pepper:~ # multipath -l
dm names   N
dm table 3600c0ff00000000007c1d167985b4b06  N
dm table 3600c0ff00000000007c1d167985b4b06  N
dm status 3600c0ff00000000007c1d167985b4b06  N
dm info 3600c0ff00000000007c1d167985b4b06  O
3600c0ff00000000007c1d167985b4b06
[size=20 GB][features="0"][hwhandler="0"]
\_ round-robin 0 [enabled]
\_ 14:0:0:0 sda 8:0  [failed]
\_ round-robin 0 [active]
 \_ 14:1:0:0 sdb 8:16 [active]

sda and sdb are actually the same device discovered by iscsi via 2 different paths. when sda failed multipathd identified the problem and diverted traffic to sdb but after correcting the sda problem, multipathd did not become aware of this and of course when
i failed sdb it did not failback to sda.
i know that multipathd is suppose to poll for failed paths and reinstate them when they become valid.
but for some reason it does not.


Herr, Manuel wrote:

On which Hardware? (HBAs, SAN)?

> -----Urspr√ľngliche Nachricht-----
> Von: dm-devel-bounces redhat com
> [mailto:dm-devel-bounces redhat com] Im Auftrag von Yonathan Cohen
> Gesendet: Mittwoch, 25. Oktober 2006 08:50
> An: dm-devel redhat com
> Betreff: [dm-devel] multipathd failback
>
> Hello.
> My "multipathd" daemon does not FailBack It does not check
> the availability of a failed path and of course does not
> reinstate it My configuration is as follows:
> cat /etc/multipath.conf
>
> defaults {
>
>         failback        immediate
> }
> I am using the following packages:
> multipath-tools-0.4.5-0.11
> device-mapper-1.01.01-1.6
> I have them installed on a SUSE LINUX Enterprise Server 9
> (x86_64) sp-3 With kernel version: 2.6.5-7.244-smp Please help.
> Thanks.
>
> ____________________________________________________________
>
> Cohen Yonatan | +972-9-9718607 (o) >
> Software. Eng,  Storage group
>
> Voltaire - _The Grid Backbone_
>
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