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From: "Moger, Babu" <Babu.Moger@lsi.com>
To: device-mapper development <dm-devel@redhat.com>
Subject: RE: multipath - AAArgh! How do I turn "features=1 queue_if_no_path" off?
Date: Wed, 30 Sep 2009 10:22:29 -0600	[thread overview]
Message-ID: <E463DF2B2E584B4A82673F53D62C2EF474E780A7@cosmail01.lsi.com> (raw)
In-Reply-To: <4AC333E2.9090005@Calva.COM>

You will see "features=1 queue_if_no_path" if you have one of the following entry in your multipath.conf.

1. Features		"1 queue_if_no_path"

  Or

2. no_path_retry           5


The first option will queue the i/o forever. The second option will queue the i/o only for 5 polling intervals. But, queue_if_no_path will show up as enabled if one of the above is true.

Try "no_path_retry    fail"  then you will not see this feature in your multipath.conf.

Thanks
Babu Moger 

> -----Original Message-----
> From: dm-devel-bounces@redhat.com [mailto:dm-devel-bounces@redhat.com]
> On Behalf Of John Hughes
> Sent: Wednesday, September 30, 2009 5:33 AM
> To: device-mapper development
> Subject: [dm-devel] multipath - AAArgh! How do I turn "features=1
> queue_if_no_path" off?
> 
> I want to turn queue_if_no_path off and use
> 
>                 polling_interval        5
>                 no_path_retry           5
> 
> because I've had problems with things hanging when a lun "vanishes" (I
> deleted it from my external raid box).
> 
> But whatever I put in /etc/multipath.conf when I do a "multipath -l" or
> "multipath-ll" it shows:
> 
> 360024e80005b3add000001b64ab05c87dm-28 DELL    ,MD3000
> [size=68G][features=1 queue_if_no_path][hwhandler=1 rdac]
> \_ round-robin 0 [prio=3][active]
>  \_ 3:0:1:13 sdad 65:208 [active][ready]
> \_ round-robin 0 [prio=0][enabled]
>  \_ 4:0:0:13 sdas 66:192 [active][ghost]
> 
> 
> How on earth do I turn this damn thing off?
> 
> --
> dm-devel mailing list
> dm-devel@redhat.com
> https://www.redhat.com/mailman/listinfo/dm-devel

  parent reply	other threads:[~2009-09-30 16:22 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-09-30 10:33 multipath - AAArgh! How do I turn "features=1 queue_if_no_path" off? John Hughes
2009-09-30 15:42 ` malahal
2009-10-01  6:24   ` Hannes Reinecke
2009-10-01  8:55     ` John Hughes
2009-10-01  9:41       ` Diedrich Ehlerding
2009-10-01  9:44       ` Hannes Reinecke
2009-09-30 16:22 ` Moger, Babu [this message]
2009-09-30 17:11   ` John Hughes
2009-10-01  9:05   ` John Hughes

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