[dm-devel] DM Multipath limits

[berthiaume, wayne]

Hi Lance.

	We've qualified 16k devices. There are changes you will need to make to achieve this. You can refer to Dell EMC's Host Connectivity Guide
for Linux page 19 for an example with RHEL 7. 

Regards,
Wayne.

Wayne Berthiaume
Manager, E-Lab Engineering Platform Qualification Team 
Dell EMC | Infrastructure Solutions Group | Platform and System Engineering | Infrastructure Engineering & Operations | e2e Validation Lab (E-LAB) 
 "FOLLOW" E-Lab Engineering at https://inside.emc.com/community/active/EOS2/elab 
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-----Original Message-----
From: dm-devel-bounces at redhat.com [mailto:dm-devel-bounces at redhat.com] On Behalf Of Lance Gropper
Sent: Wednesday, January 10, 2018 12:11 PM
To: christophe.varoqui at opensvc.com; dm-devel at redhat.com
Subject: [dm-devel] DM Multipath limits

Hello Christophe:

We ran into a situation yesterday, where it appears there is a limit on the number of targets that DM Multipath can use. We are switching to a switch/zoning configuration at our office which may present as many as
2500 targets to the system. Yesterday, we were testing a smaller config, and the limit on the number of targets appears to be 640. When we exceed 640, the system locks up. When we try 656 targets, it locks up, then if we back out the last 16 targets and replace them with 16 different ones, it still locks up. We backed off the zoning for the meantime (which cripples the connection/bandwidth) to about 280 targets, but every filesystem multipaths properly.

Do you know what is going on, and is there some way to increase this limit?

Lance

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