Matt, 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 (vpuvv...@in.ibm.com) From: Matt Weil <mw...@wustl.edu> To: firstname.lastname@example.org Date: 03/23/2020 11:39 PM Subject: [EXTERNAL] [gpfsug-discuss] AFM gateway node scaling Sent by: gpfsug-discuss-boun...@spectrumscale.org Hello all, 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. Matt _______________________________________________ gpfsug-discuss mailing list gpfsug-discuss at spectrumscale.org https://urldefense.proofpoint.com/v2/url?u=http-3A__gpfsug.org_mailman_listinfo_gpfsug-2Ddiscuss&d=DwIGaQ&c=jf_iaSHvJObTbx-siA1ZOg&r=92LOlNh2yLzrrGTDA7HnfF8LFr55zGxghLZtvZcZD7A&m=BosatlBIMbvMZJYB2C0VAcEW4Dr9ApcpPbM9zYSCz7A&s=dmS3n52oSxBzBmWt0E1YgfkPxxwttyfkDBt_sW60f6I&e=
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