[gpfsug-discuss] AFM gateway node scaling
Venkateswara R Puvvada
vpuvvada at in.ibm.com
Wed Mar 25 16:50:41 GMT 2020
It is recommended to have dedicated AFM gateway nodes. Memory and CPU
requirements for AFM gateway node depends on the number of filesets
handled by the node and the inode usage of those filesets. Since AFM keeps
track of changes in the memory, any network disturbance can cause the
memory utilization to go high and which eventually leads to in-memory
queue to be dropped. After the queue is dropped, AFM runs recovery to
recover the lost operations which is expensive as it involves creating the
snapshot, running policy scan, doing readdir from home/secondary and build
the list of lost operations. When the gateway node goes down, all the
filesets handled by that node distributed to the remaining active gateway
nodes. After the gateway node comes back, filesets are transferred back to
the original gateway node. When designing the gateway node, make sure that
it have enough memory , CPU resources for handling the incoming and
outgoing data based on the bandwidth. Limit the filesets per gateway(ex.
less than 20 filesets per gateway) so that number of AFM recoveries
triggered will be minimal when the queues are lost. Also limit the total
number of inodes handled by the gateway node across all the filesets (ex.
less than 400 million inodes per gateway). AFM gateway nodes are licensed
as server nodes.
~Venkat (vpuvvada at in.ibm.com)
From: Matt Weil <mweil at wustl.edu>
To: gpfsug-discuss at spectrumscale.org
Date: 03/23/2020 11:39 PM
Subject: [EXTERNAL] [gpfsug-discuss] AFM gateway node scaling
Sent by: gpfsug-discuss-bounces at spectrumscale.org
Is there any guide and or recommendation as to how to scale this.
filesets per gateway node? Is it necessary to separate NSD server and
gateway roles. Are dedicated gateway nodes licensed as clients?
Thanks for any guidance.
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