[dm-devel] [PATCH] multipath-tools: make EMC/Invista config work with alua and multibus

[berthiaume, wayne]

Hi Xose.

	OPM is no longer supported in the Dell VPLEX product. If we at Dell had wished to change the default device stanzas for any of our products they would have been done when the product and/or feature is released. Please remove this patch as well. It is not needed.

Regards,
Wayne.

Wayne Berthiaume
Manager, E-Lab Engineering Platform Qualification Team 
Dell EMC | Server & Infrastructure Systems | Platform and System Engineering | Infrastructure Engineering & Operations | e2e Validation Lab (E-LAB) 
176 South Street
Hopkinton, MA 01748
+1 (512) 647-6157 (office)
wayne.berthiaume at dell.com 
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-----Original Message-----
From: dm-devel-bounces at redhat.com <dm-devel-bounces at redhat.com> On Behalf Of Xose Vazquez Perez
Sent: Tuesday, September 28, 2021 1:31 PM
Cc: Xose Vazquez Perez; Martin Wilck; DM-DEVEL ML
Subject: [dm-devel] [PATCH] multipath-tools: make EMC/Invista config work with alua and multibus


[EXTERNAL EMAIL] 

Optimal Path Management (OPM) was introduced with VPLEX 5.5 to improve VPLEX performance. OPM uses the ALUA mechanism to spread the I/O load across VPLEX directors while gaining cache locality, pag #187:
https://www.delltechnologies.com/en-us/collaterals/unauth/technical-guides-support-information/products/storage-2/docu5128.pdf

Cc: Martin Wilck <mwilck at suse.com>
Cc: Benjamin Marzinski <bmarzins at redhat.com>
Cc: Christophe Varoqui <christophe.varoqui at opensvc.com>
Cc: DM-DEVEL ML <dm-devel at redhat.com>
Signed-off-by: Xose Vazquez Perez <xose.vazquez at gmail.com>
---
 libmultipath/hwtable.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libmultipath/hwtable.c b/libmultipath/hwtable.c index 7095aaf1..4e8b52ff 100644
--- a/libmultipath/hwtable.c
+++ b/libmultipath/hwtable.c
@@ -350,8 +350,9 @@ static struct hwentry default_hw[] = {
 		.vendor        = "EMC",
 		.product       = "Invista",
 		.bl_product    = "LUNZ",
-		.pgpolicy      = MULTIBUS,
+		.pgpolicy      = GROUP_BY_PRIO,
 		.no_path_retry = 5,
+		.pgfailback    = -FAILBACK_IMMEDIATE,
 	},
 	{
 		/* XtremIO */
--
2.32.0

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