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how to manual timeout cache when mounted nfs export on vms
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11-24-2009 10:35 PM
11-24-2009 10:35 PM
how to manual timeout cache when mounted nfs export on vms
how to manual timeout cache when mounted nfs export on vms
Hi all
I have mounted an nfs device on VMS from linux and am writing to a file on linux and then need to access that file on vms but the vms nfs client cannot see the file yet.
Is there a way to tell the vms nfs client that it shouldn't use the cached version?
i've found /cache_timeout option when mounting the device but would prefer a way to do it manually as decreasing the cache timeout value will increase network usage and I still wouldn't be able to guarentee that the file will be there.
I've tried running type on the file to get vms to prod the nfs server to get the file with mixed results.
Thanks
Caleb Baker
I have mounted an nfs device on VMS from linux and am writing to a file on linux and then need to access that file on vms but the vms nfs client cannot see the file yet.
Is there a way to tell the vms nfs client that it shouldn't use the cached version?
i've found /cache_timeout option when mounting the device but would prefer a way to do it manually as decreasing the cache timeout value will increase network usage and I still wouldn't be able to guarentee that the file will be there.
I've tried running type on the file to get vms to prod the nfs server to get the file with mixed results.
Thanks
Caleb Baker
1 REPLY
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11-25-2009 07:34 AM
11-25-2009 07:34 AM
Re: how to manual timeout cache when mounted nfs export on vms
Re: how to manual timeout cache when mounted nfs export on vms
Sure; it's called sftp, scp, http get/post, ftp, or...
This isn't really an OpenVMS question, FWIW. Substantial caching is inherent in nfs clients and servers and particularly prior to V4 and with versions prior to 3 lacking even weak coherence options; if you don't cache extensively, then nfs performance craters.
Some NFS caching Background:
http://www.unixcoding.org/NFSCoding
Gonzo NFS background:
_NFS Illustrated_, by Brent Callaghan.
NFS (and particularly the older, stateless versions) is not suited to rapid turn-around file-sharing operations.
This isn't really an OpenVMS question, FWIW. Substantial caching is inherent in nfs clients and servers and particularly prior to V4 and with versions prior to 3 lacking even weak coherence options; if you don't cache extensively, then nfs performance craters.
Some NFS caching Background:
http://www.unixcoding.org/NFSCoding
Gonzo NFS background:
_NFS Illustrated_, by Brent Callaghan.
NFS (and particularly the older, stateless versions) is not suited to rapid turn-around file-sharing operations.
The opinions expressed above are the personal opinions of the authors, not of Hewlett Packard Enterprise. By using this site, you accept the Terms of Use and Rules of Participation.
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