[linux-lvm] LVM + Multipathing

[Luca Berra]

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 at comedia.it
        Communication Media & Services S.r.l.
 /"\
 \ /     ASCII RIBBON CAMPAIGN
  X        AGAINST HTML MAIL
 / \