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Slow Drains impact on your SAN
See this recent blog post by Erik Smith (@provandal) regarding the impact of Slow Drain conditions on your SAN.
"If you work with Fibre Channel on a regular basis and have come to depend on its excellent performance attributes, you might be surprised to learn that many of the cases handled by our SAN team in Customer Support are related to performance problems. Typically, as we dig into these cases, we discover the majority of them are not actually caused by the FC switches themselves, but rather by end devices that are not performing as expected and are causing fabric wide congestion. These misbehaving end devices are referred to as “slow drains” and they represent a well-known class of problem that is inherent to all lossless transports including FC, DCB Ethernet (e.g., FCoE, RoCE) and even wastewater drain systems (e.g., “Plumbing”)."
http://brasstacksblog.typepad.com/brass-tacks/2016/02/slow-drains-are-impacting-your-san.html
Anonymous
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February 18th, 2016 14:00
DCNM 7.2(1) for SAN, released by EMC in August, 2015, added some new Slow Drain detection and avoidance features to the DCNM SAN client and Device Manager tools. This allows the user to monitor for:
Click here for more info:
http://www.cisco.com/c/en/us/products/collateral/cloud-systems-management/prime-data-center-network-manager/bulletin-c25-735417.html
ramsdell
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February 19th, 2016 06:00
Through FPI and MAPS, features of Brocade Fabric Vision technology, the following actions are available for Slow Drain device conditions via FOS v7.4:
Click here for more info:
https://www.brocade.com/content/dam/common/documents/content-types/faqs/brocade-fabric-vision-faq.pdf
Ed Schulte
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February 26th, 2016 06:00
The Slow Drain Knowledge Map is also on EMC support, in the following KB article;
464027 : Slow Drain Knowledge Map:
https://support.emc.com/kb/464027
ramsdell
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February 26th, 2016 09:00
Thanks Ed! The diagram reinforces some of the inherent complications and time in manual diagnosis of Slow Drain conditions across a SAN. Efficient use of the tools can lead to quicker remediation.
Anonymous
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March 28th, 2016 14:00
EMC offers professional services to help you proactively manage and optimize your SAN to prevent slow draining devices from impacting your network. Please contact your EMC Sales Rep today to learn more.