Customers using Linux host (mostly RHEL host) using a SAN network for block
storage, complain the Linux multipath stack is not resilient to handle
non-deterministic storage network behaviors. This has caused many customer move
away to non-linux based servers. The intent of the below patch and th
On 12/19/2016 12:50 PM, Muneendra Kumar M wrote:
> Customers using Linux host (mostly RHEL host) using a SAN network for
> block storage, complain the Linux multipath stack is not resilient to
> handle non-deterministic storage network behaviors. This has caused many
> customer move away to non-lin
Have you looked into the delay_watch_checks and delay_wait_checks
configuration parameters? The idea behind them is to minimize the use
of paths that are intermittently failing.
-Ben
On Mon, Dec 19, 2016 at 11:50:36AM +, Muneendra Kumar M wrote:
>Customers using Linux host (mostly RHEL h
: dm-devel@redhat.com
Subject: Re: [dm-devel] deterministic io throughput in multipath
Have you looked into the delay_watch_checks and delay_wait_checks configuration
parameters? The idea behind them is to minimize the use of paths that are
intermittently failing.
-Ben
On Mon, Dec 19, 2016 at 11
it_checks.
Regards,
Muneendra.
-Original Message-
From: Muneendra Kumar M
Sent: Thursday, December 22, 2016 11:10 AM
To: 'Benjamin Marzinski'
Cc: dm-devel@redhat.com
Subject: RE: [dm-devel] deterministic io throughput in multipath
Hi Ben,
Thanks for the reply.
I will look i
dd for delay_watch_checks and
> delay_wait_checks.
>
> Regards,
> Muneendra.
>
>
>
> -Original Message-
> From: Muneendra Kumar M
> Sent: Thursday, December 22, 2016 11:10 AM
> To: 'Benjamin Marzinski'
> Cc: dm-devel@redhat.com
> Subject:
Hi Ben,
Thanks for the information.
Regards,
Muneendra.
-Original Message-
From: Benjamin Marzinski [mailto:bmarz...@redhat.com]
Sent: Tuesday, January 03, 2017 10:42 PM
To: Muneendra Kumar M
Cc: dm-devel@redhat.com
Subject: Re: [dm-devel] deterministic io throughput in multipath
On
devel@redhat.com<mailto:dm-devel@redhat.com>
Subject: Re: [dm-devel] deterministic io throughput in multipath
On Mon, Dec 26, 2016 at 09:42:48AM +, Muneendra Kumar M wrote:
> Hi Ben,
>
> If there are two paths on a dm-1 say sda and sdb as below.
>
> # multipath -ll
> m
;state for san_path_err_recovery_time duration. Once
>san_path_err_recovery_time has timeout we will reinstate the failed path
>.
>
> Regards,
>Muneendra.
>
> -Original Message-
>From: Muneendra Kumar M
>Sent: Wednesday, Jan
Hi Ben,
>Thanks for the information.
>
>Regards,
>Muneendra.
>
> -----Original Message-----
>From: Benjamin Marzinski [[1]mailto:bmarz...@redhat.com]
>Sent: Tuesday, January 03, 2017 10:42 PM
>To: Muneendra Kumar M
> <[2]mmand...@brocade.com
+++---
Regards,
Muneendra.
_
From: Muneendra Kumar M
Sent: Tuesday, January 17, 2017 4:13 PM
To: 'Benjamin Marzinski'
Cc: dm-devel@redhat.com
Subject: RE: [dm-devel] deterministic io throughput in multipath
Hi Ben,
Thanks for the
0
>+++---
>
>
>Regards,
>Muneendra.
>
>_
>From: Muneendra Kumar M
> Sent: Tuesday, January 17, 2017 4:13 PM
>To: 'Ben
ill incorporate all the changes mentioned below and will resend the
>patch once the testing is done.
>
>Regards,
>Muneendra.
>
>
>
>-Original Message-----
>From: Benjamin Marzinski [[1]mailto:bmarz...@redhat.com]
>Sent: Tu
egards,
> Muneendra.
>
>
>
> -Original Message-
> From: Benjamin Marzinski [mailto:bmarz...@redhat.com]
> Sent: Wednesday, January 25, 2017 2:59 PM
> To: Muneendra Kumar M
> Cc: dm-devel@redhat.com
> Subject: Re: [dm-devel] deterministic io throughput in multipa
:37 PM
To: Muneendra Kumar M
Cc: dm-devel@redhat.com
Subject: Re: [dm-devel] deterministic io throughput in multipath
On Wed, Jan 25, 2017 at 11:48:33AM +, Muneendra Kumar M wrote:
> Hi Ben,
> Thanks for the review .
> I will consider the below points and will do the necessary change
This is certainly moving in the right direction. There are a couple of
things I would change. check_path_reinstate_state() will automatically
disable the path if there are configuration problems. If things aren't
configured correctly, or the code can't get the current time, it seems
like it should
Message-
From: Benjamin Marzinski [mailto:bmarz...@redhat.com]
Sent: Thursday, February 02, 2017 7:20 AM
To: Muneendra Kumar M
Cc: device-mapper development
Subject: RE: [dm-devel] deterministic io throughput in multipath
This is certainly moving in the right direction. There are a couple of
;
>
>
>
> -Original Message-
> From: Benjamin Marzinski [mailto:bmarz...@redhat.com]
> Sent: Thursday, February 02, 2017 7:20 AM
> To: Muneendra Kumar M
> Cc: device-mapper development
> Subject: RE: [dm-devel] deterministic io throughput in multipath
>
>
development
Subject: Re: [dm-devel] deterministic io throughput in multipath
This looks fine. Thanks for all your work on this
ACK
-Ben
On Thu, Feb 02, 2017 at 11:48:39AM +, Muneendra Kumar M wrote:
> Hi Ben,
> The below changes suggested by you are good. Thanks for it.
> I have t
njamin Marzinski [mailto:bmarz...@redhat.com]
> Sent: Thursday, February 02, 2017 11:09 PM
> To: Muneendra Kumar M
> Cc: device-mapper development
> Subject: Re: [dm-devel] deterministic io throughput in multipath
>
> This looks fine. Thanks for all your work on this
>
>
.@brocade.com>
X-Mailer: git-send-email 1.8.3.1
Regards,
Muneendra.
-Original Message-
From: Benjamin Marzinski [mailto:bmarz...@redhat.com]
Sent: Friday, February 03, 2017 12:00 AM
To: Muneendra Kumar M
Cc: device-mapper development
Subject: Re: [dm-devel] deterministic io throughput i
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