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04-06-2006 04:00 AM
04-06-2006 04:00 AM
Linux NFS share extremely slow
to all other linux boxes also with 1g interface on the same Cisco 6509 blade.
however the NFS tranfer crawls in comparison to a rsync job
I mounted the clients with rsize=8192,wsize=8192 that does'nt help either.
any ideas, I am at a dead end :-(
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04-06-2006 04:31 AM
04-06-2006 04:31 AM
Re: Linux NFS share extremely slow
Try using udp as the protocol, also, not always a large block size is the best, you can try different values.
Check the output of netstat -ni, check for collisions and errors, ensure that your switch and network adapter are negotiating the right speed, use ethtool for this.
See also:
http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.doc/aixbman/prftungd/nfscliprfmon.htm
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04-06-2006 05:06 AM
04-06-2006 05:06 AM
Re: Linux NFS share extremely slow
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04-06-2006 12:26 PM
04-06-2006 12:26 PM
Re: Linux NFS share extremely slow
using UDP instead of TCP might speed things a bit. you might also increase the windows' size (for instance, I am using rsize=32768,wsize=32768,proto=tcp,soft). The best bet is to try different settings and see which one suits you.
Something else you might try (beware, it might not be convenient for you) is to mount the share with the "noatime" option. Other possible options are the "async" mode and writeback journaling.
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04-06-2006 07:18 PM
04-06-2006 07:18 PM
Re: Linux NFS share extremely slow
You shouldn't have to change for UDP or window size to work perfectly !
Don't you have an automount problem or similar ?
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04-07-2006 04:53 AM
04-07-2006 04:53 AM
Re: Linux NFS share extremely slow
likely find you aren't copying much. I
use rsync to copy web logs as I only have
to copy the last hours worth of data on
each copy even though the file is growing.
With NFS I would have to copy the whole file.
As the weblogs rotate weekly it makes a
big difference at the end of the week.
If copies run at differenct speeds depending
on which direction. Read is fast but write is
slow or vice versa, it likely a duplex issue.
You could enable async access to the share.
This risks loosing data if the server goes
down between the time it receives a block and
gets it written to disk. A good UPS would
reduce that risk.