[dm-devel] deterministic io throughput in multipath
Muneendra Kumar M
mmandala at Brocade.com
Thu Dec 22 05:39:36 UTC 2016
Hi Ben,
Thanks for the reply.
I will look into this parameters will do the internal testing and let you know the results.
Regards,
Muneendra.
-----Original Message-----
From: Benjamin Marzinski [mailto:bmarzins at redhat.com]
Sent: Wednesday, December 21, 2016 9:40 PM
To: Muneendra Kumar M <mmandala at Brocade.com>
Cc: dm-devel at 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 11:50:36AM +0000, 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-linux based servers. The intent of the below
> patch and the prevailing issues are given below. With the below design we
> are seeing the Linux multipath stack becoming resilient to such network
> issues. We hope by getting this patch accepted will help in more Linux
> server adoption that use SAN network.
>
> I have already sent the design details to the community in a different
> mail chain and the details are available in the below link.
>
> [1]https://urldefense.proofpoint.com/v2/url?u=https-3A__www.redhat.com_archives_dm-2Ddevel_2016-2DDecember_msg00122.html&d=DgIDAw&c=IL_XqQWOjubgfqINi2jTzg&r=E3ftc47B6BGtZ4fVaYvkuv19wKvC_Mc6nhXaA1sBIP0&m=vfwpVp6e1KXtRA0ctwHYJ7cDmPsLi2C1L9pox7uexsY&s=q5OI-lfefNC2CHKmyUkokgiyiPo_Uj7MRu52hG3MKzM&e= .
>
> Can you please go through the design and send the comments to us.
>
>
>
> Regards,
>
> Muneendra.
>
>
>
>
>
> References
>
> Visible links
> 1.
> https://urldefense.proofpoint.com/v2/url?u=https-3A__www.redhat.com_ar
> chives_dm-2Ddevel_2016-2DDecember_msg00122.html&d=DgIDAw&c=IL_XqQWOjub
> gfqINi2jTzg&r=E3ftc47B6BGtZ4fVaYvkuv19wKvC_Mc6nhXaA1sBIP0&m=vfwpVp6e1K
> XtRA0ctwHYJ7cDmPsLi2C1L9pox7uexsY&s=q5OI-lfefNC2CHKmyUkokgiyiPo_Uj7MRu
> 52hG3MKzM&e=
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