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Full Discussion: Effects on data size during encrypted transfer
Special Forums Cybersecurity Effects on data size during encrypted transfer Post 302384447 by ahmerin on Tuesday 5th of January 2010 11:12:07 AM
Old 01-05-2010
Effects on data size during encrypted transfer
Hi There,

I wonder if any one can help me.

I want to transfer a file from one site to another over an encrypted link. I want to know if there will be any imcrease in the data that will travel on the link? For example, I want to transfer a 1 GB file from one site to another, using an encrypted link - like a VPN, will the data that will travel be the same size - 1 GB or it will be different? I know that there will be some increase in size, but I want to know the rough estimate - like 20% increase or 50% increase etc. Can someone please help?

With Kind Regards
Ahmerin
 

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LEARN ABOUT HPUX

nfs4_bsize

nfs4_bsize(5)							File Formats Manual						     nfs4_bsize(5)

NAME

       nfs4_bsize - controls the logical block size used by NFS version 4 clients

VALUES

   Failsafe
   Default
   Allowed values
   Recommended values
       A  warning  will  be  issued  at runtime if the tunable is set to a value greater than 1048576 bytes since this is beyond the tested limit.
       This is not a serious warning but just an information message for the administrator.

DESCRIPTION

       controls the logical block size used by NFS version 4 clients. This block size represents the amount of data the client	attempts  to  read
       from or write to the server when it needs to do I/O.

   Who Is Expected to Change This Tunable?
       The distributed file system administrator should examine this value and change it if a larger transfer size is needed.

   Restrictions on Changing
       The  tunable is dynamic; however, the logical block size setting for a file system is set when the file system is mounted. To affect a par-
       ticular file system, unmount and mount the file system after changing this parameter.

   When Should the Value of This Tunable Be Raised?
       Increase this parameter and also the and parameters if larger transfers are desired.

   What Are the Side Effects of Raising the Value?
       More kernel memory is used to manage the transfer buffer.

   When Should the Value of This Tunable Be Lowered?
       Lower the value of this tunable if smaller transfer sizes are desired.

   What Are the Side Effects of Lowering the Value?
       Setting this value to less then 32 KB will increase the number of requests to the NFS Server.

WARNINGS

       All HP-UX kernel tunable parameters are release specific.  This parameter may be removed or have its meaning changed in future releases	of
       HP-UX.

       Installation  of  optional  kernel  software, from HP or other vendors, may cause changes to tunable parameter values.  After installation,
       some tunable parameters may no longer be at the default or recommended values.  For information about the effects of installation  on  tun-
       able  values,  consult  the documentation for the kernel software being installed.  For information about optional kernel software that was
       factory installed on your system, see at

AUTHOR

       was developed by Sun Microsystems, Inc.

SEE ALSO

       kctune(1M), sam(1M), gettune(2), settune(2), nfs3_bsize(5), nfs4_max_transfer_size(5), nfs4_max_transfer_size_cots(5), values(5).

							     Tunable Kernel Parameters						     nfs4_bsize(5)
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