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тАО04-18-2011 04:16 AM
тАО04-18-2011 04:16 AM
I've 500 GB FS and I'm copying data using pax from this FS to another FS of the same size in the server.
I'm usinng glace to monitor.
I see very less disk I/O and most of the time the process wait status is either Cache or I/O
Please advise if this a desired or needs to fine tuned
Thanks
Solved! Go to Solution.
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тАО04-18-2011 10:29 AM
тАО04-18-2011 10:29 AM
Re: Wait Status is Cache
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тАО04-19-2011 02:24 AM
тАО04-19-2011 02:24 AM
Re: Wait Status is Cache
Please advise if there is any possiblities to fine any settings to improve the performance of the copy
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тАО04-19-2011 05:00 AM
тАО04-19-2011 05:00 AM
SolutionI have found that subtantial improvement in copy time can be made by temporarily changing the target filesystem mount options to negate caching.
For for data replication use 'pax' [blocking doesn't matter]. During the file copy session, mount the destination filesystem with the options '-o largefiles,nolog,convosync=delay' for the fastest replication. When the copy completes, unmount and remount with normal, protective options, or use the '-o remount' option with the other arguments you need to (re)apply.
Regards!
...JRF...
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тАО04-19-2011 06:44 AM
тАО04-19-2011 06:44 AM
Re: Wait Status is Cache
Please provide some documentation and possible example which explain these options
I know man is the best place to start with.
But if you have docs which explains it in easy words . Please pass it on.
Thanks
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тАО04-19-2011 06:59 AM
тАО04-19-2011 06:59 AM
Re: Wait Status is Cache
> I know man is the best place to start with.
Indeed, see the manpages for 'mount_vxfs(1M)'. Strangely, this is missing from the 11.31 manpages (at least online), so use:
http://bizsupport.austin.hp.com/bc/docs/support/SupportManual/c01921587/c01921587.pdf
Regards!
...JRF...