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2 Intern
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January 30th, 2014 13:00
NFS file system copy slow should I increase v3xfersize?
Hi,
Some of the dbas are complaining that their copy job for an installation over a Unified vnx5700 nfs mount point is dreadfully slow. I looked at the data-mover stats and found that it was not close to reaching any limit. I am not sure where else to look quite honestly. the rsize, wsize are 32726, should I increase that, and if I do, do I have to increase a parameter on the data mover as well?
Thanks!
Benita
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Rainer_EMC
6 Operator
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8.6K Posts
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January 31st, 2014 01:00
First check what the v3xfersize current values is on your system – in newer VNX OE version the default is depending on your data mover type/memory
If you already are using 32k then I don’t think that’s the cause of “dreadfully slow”
I would suggest to check your networking stats on client, switch and VNX
Server_stats can also tell you what NFS IO size your clients are currently using – see man server_stats
admingirl
2 Intern
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614 Posts
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January 31st, 2014 06:00
Here is the string.
umichklewis
4 Apprentice
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1.2K Posts
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January 31st, 2014 06:00
You might also consider what mount options your NFS servers are using. Can you post their mount string? Usually, I try to set "noatime", unless my UNIX admins are sure they need it.
Let us know what you find!
Karl
admingirl
2 Intern
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614 Posts
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January 31st, 2014 06:00
How do I check the value of v3xfersize?
admingirl
2 Intern
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614 Posts
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January 31st, 2014 06:00
I don't see the value when I list server_stats for that data mover.
Rainer_EMC
6 Operator
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8.6K Posts
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January 31st, 2014 13:00
Its included in one of the collections – use the option to list the full list of stats