From: Luca Berra <bluca@comedia.it>
To: linux-lvm@redhat.com
Subject: Re: [linux-lvm] LVM + Multipathing
Date: Tue, 20 Feb 2007 07:11:51 +0100 [thread overview]
Message-ID: <20070220061150.GA3215@percy.comedia.it> (raw)
In-Reply-To: <3nmja4-jtv.ln1@www.researchut.com>
On Sat, Feb 17, 2007 at 09:52:27PM +0530, Ritesh Raj Sarraf wrote:
>Hi,
>
>I have a question regarding the combination of LVM + Multipathing in a SAN
>environment.
>
>I have a LUN mapped to a host using iSCSI. I have two two paths to the LUN. This
>setup, using multipathing, provides me failover functionality.
>
>My question is how does LVM react to path failures ?
>In a failover environment, multipathing can take upto 120 seconds to detect that
>the active path to the LUN is no more available and then switch to the
>secondary path. During this 120 seconds, how does LVM react ? Does it really
>sense that the device is offlined ? Or that information is never passed to LVM
>and it just allows I/O to happen leaving that responsibility to the
>multipathing layer ?
i believe LVM does not react at all.
L.
--
Luca Berra -- bluca@comedia.it
Communication Media & Services S.r.l.
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next prev parent reply other threads:[~2007-02-20 6:11 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-17 16:22 [linux-lvm] LVM + Multipathing Ritesh Raj Sarraf
2007-02-20 6:11 ` Luca Berra [this message]
2007-02-20 12:30 ` [linux-lvm] " Ritesh Raj Sarraf
2007-02-20 13:19 ` Luca Berra
2007-02-20 14:49 ` [linux-lvm] " Ritesh Raj Sarraf
2007-02-28 18:30 ` Dave Wysochanski
2007-02-20 17:03 ` [linux-lvm] " Matt P
2007-02-20 17:13 ` Christian.Rohrmeier
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